[mirror_ubuntu-bionic-kernel.git] / sound / soc / atmel / atmel-classd.c

/* Atmel ALSA SoC Audio Class D Amplifier (CLASSD) driver
 *
 * Copyright (C) 2015 Atmel
 *
 * Author: Songjun Wu <songjun.wu@atmel.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 or later
 * as published by the Free Software Foundation.
 */

#include <linux/of.h>
#include <linux/clk.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <sound/core.h>
#include <sound/dmaengine_pcm.h>
#include <sound/pcm_params.h>
#include <sound/tlv.h>
#include "atmel-classd.h"

struct atmel_classd_pdata {
	bool non_overlap_enable;
	int non_overlap_time;
	int pwm_type;
	const char *card_name;
};

struct atmel_classd {
	dma_addr_t phy_base;
	struct regmap *regmap;
	struct clk *pclk;
	struct clk *gclk;
	struct clk *aclk;
	int irq;
	const struct atmel_classd_pdata *pdata;
};

#ifdef CONFIG_OF
static const struct of_device_id atmel_classd_of_match[] = {
	{
		.compatible = "atmel,sama5d2-classd",
	}, {
		/* sentinel */
	}
};
MODULE_DEVICE_TABLE(of, atmel_classd_of_match);

static struct atmel_classd_pdata *atmel_classd_dt_init(struct device *dev)
{
	struct device_node *np = dev->of_node;
	struct atmel_classd_pdata *pdata;
	const char *pwm_type;
	int ret;

	if (!np) {
		dev_err(dev, "device node not found\n");
		return ERR_PTR(-EINVAL);
	}

	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
		return ERR_PTR(-ENOMEM);

	ret = of_property_read_string(np, "atmel,pwm-type", &pwm_type);
	if ((ret == 0) && (strcmp(pwm_type, "diff") == 0))
		pdata->pwm_type = CLASSD_MR_PWMTYP_DIFF;
	else
		pdata->pwm_type = CLASSD_MR_PWMTYP_SINGLE;

	ret = of_property_read_u32(np,
			"atmel,non-overlap-time", &pdata->non_overlap_time);
	if (ret)
		pdata->non_overlap_enable = false;
	else
		pdata->non_overlap_enable = true;

	ret = of_property_read_string(np, "atmel,model", &pdata->card_name);
	if (ret)
		pdata->card_name = "CLASSD";

	return pdata;
}
#else
static inline struct atmel_classd_pdata *
atmel_classd_dt_init(struct device *dev)
{
	return ERR_PTR(-EINVAL);
}
#endif

#define ATMEL_CLASSD_RATES (SNDRV_PCM_RATE_8000 \
			| SNDRV_PCM_RATE_16000	| SNDRV_PCM_RATE_22050 \
			| SNDRV_PCM_RATE_32000	| SNDRV_PCM_RATE_44100 \
			| SNDRV_PCM_RATE_48000	| SNDRV_PCM_RATE_88200 \
			| SNDRV_PCM_RATE_96000)

static const struct snd_pcm_hardware atmel_classd_hw = {
	.info			= SNDRV_PCM_INFO_MMAP
				| SNDRV_PCM_INFO_MMAP_VALID
				| SNDRV_PCM_INFO_INTERLEAVED
				| SNDRV_PCM_INFO_RESUME
				| SNDRV_PCM_INFO_PAUSE,
	.formats		= (SNDRV_PCM_FMTBIT_S16_LE),
	.rates			= ATMEL_CLASSD_RATES,
	.rate_min		= 8000,
	.rate_max		= 96000,
	.channels_min		= 1,
	.channels_max		= 2,
	.buffer_bytes_max	= 64 * 1024,
	.period_bytes_min	= 256,
	.period_bytes_max	= 32 * 1024,
	.periods_min		= 2,
	.periods_max		= 256,
};

#define ATMEL_CLASSD_PREALLOC_BUF_SIZE  (64 * 1024)

/* cpu dai component */
static int atmel_classd_cpu_dai_startup(struct snd_pcm_substream *substream,
					struct snd_soc_dai *cpu_dai)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct atmel_classd *dd = snd_soc_card_get_drvdata(rtd->card);

	regmap_write(dd->regmap, CLASSD_THR, 0x0);

	return clk_prepare_enable(dd->pclk);
}

static void atmel_classd_cpu_dai_shutdown(struct snd_pcm_substream *substream,
					struct snd_soc_dai *cpu_dai)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct atmel_classd *dd = snd_soc_card_get_drvdata(rtd->card);

	clk_disable_unprepare(dd->pclk);
}

static const struct snd_soc_dai_ops atmel_classd_cpu_dai_ops = {
	.startup	= atmel_classd_cpu_dai_startup,
	.shutdown	= atmel_classd_cpu_dai_shutdown,
};

static struct snd_soc_dai_driver atmel_classd_cpu_dai = {
	.playback = {
		.channels_min	= 1,
		.channels_max	= 2,
		.rates		= ATMEL_CLASSD_RATES,
		.formats	= SNDRV_PCM_FMTBIT_S16_LE,},
	.ops = &atmel_classd_cpu_dai_ops,
};

static const struct snd_soc_component_driver atmel_classd_cpu_dai_component = {
	.name = "atmel-classd",
};

/* platform */
static int
atmel_classd_platform_configure_dma(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params,
	struct dma_slave_config *slave_config)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct atmel_classd *dd = snd_soc_card_get_drvdata(rtd->card);

	if (params_physical_width(params) != 16) {
		dev_err(rtd->platform->dev,
			"only supports 16-bit audio data\n");
		return -EINVAL;
	}

	if (params_channels(params) == 1)
		slave_config->dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
	else
		slave_config->dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;

	slave_config->direction		= DMA_MEM_TO_DEV;
	slave_config->dst_addr		= dd->phy_base + CLASSD_THR;
	slave_config->dst_maxburst	= 1;
	slave_config->src_maxburst	= 1;
	slave_config->device_fc		= false;

	return 0;
}

static const struct snd_dmaengine_pcm_config
atmel_classd_dmaengine_pcm_config = {
	.prepare_slave_config	= atmel_classd_platform_configure_dma,
	.pcm_hardware		= &atmel_classd_hw,
	.prealloc_buffer_size	= ATMEL_CLASSD_PREALLOC_BUF_SIZE,
};

/* codec */
static const char * const mono_mode_text[] = {
	"mix", "sat", "left", "right"
};

static SOC_ENUM_SINGLE_DECL(classd_mono_mode_enum,
			CLASSD_INTPMR, CLASSD_INTPMR_MONO_MODE_SHIFT,
			mono_mode_text);

static const char * const eqcfg_text[] = {
	"Treble-12dB", "Treble-6dB",
	"Medium-8dB", "Medium-3dB",
	"Bass-12dB", "Bass-6dB",
	"0 dB",
	"Bass+6dB", "Bass+12dB",
	"Medium+3dB", "Medium+8dB",
	"Treble+6dB", "Treble+12dB",
};

static const unsigned int eqcfg_value[] = {
	CLASSD_INTPMR_EQCFG_T_CUT_12, CLASSD_INTPMR_EQCFG_T_CUT_6,
	CLASSD_INTPMR_EQCFG_M_CUT_8, CLASSD_INTPMR_EQCFG_M_CUT_3,
	CLASSD_INTPMR_EQCFG_B_CUT_12, CLASSD_INTPMR_EQCFG_B_CUT_6,
	CLASSD_INTPMR_EQCFG_FLAT,
	CLASSD_INTPMR_EQCFG_B_BOOST_6, CLASSD_INTPMR_EQCFG_B_BOOST_12,
	CLASSD_INTPMR_EQCFG_M_BOOST_3, CLASSD_INTPMR_EQCFG_M_BOOST_8,
	CLASSD_INTPMR_EQCFG_T_BOOST_6, CLASSD_INTPMR_EQCFG_T_BOOST_12,
};

static SOC_VALUE_ENUM_SINGLE_DECL(classd_eqcfg_enum,
		CLASSD_INTPMR, CLASSD_INTPMR_EQCFG_SHIFT, 0xf,
		eqcfg_text, eqcfg_value);

static const DECLARE_TLV_DB_SCALE(classd_digital_tlv, -7800, 100, 1);

static const struct snd_kcontrol_new atmel_classd_snd_controls[] = {
SOC_DOUBLE_TLV("Playback Volume", CLASSD_INTPMR,
		CLASSD_INTPMR_ATTL_SHIFT, CLASSD_INTPMR_ATTR_SHIFT,
		78, 1, classd_digital_tlv),

SOC_SINGLE("Deemphasis Switch", CLASSD_INTPMR,
		CLASSD_INTPMR_DEEMP_SHIFT, 1, 0),

SOC_SINGLE("Mono Switch", CLASSD_INTPMR, CLASSD_INTPMR_MONO_SHIFT, 1, 0),

SOC_SINGLE("Swap Switch", CLASSD_INTPMR, CLASSD_INTPMR_SWAP_SHIFT, 1, 0),

SOC_ENUM("Mono Mode", classd_mono_mode_enum),

SOC_ENUM("EQ", classd_eqcfg_enum),
};

static const char * const pwm_type[] = {
	"Single ended", "Differential"
};

static int atmel_classd_codec_probe(struct snd_soc_codec *codec)
{
	struct snd_soc_card *card = snd_soc_codec_get_drvdata(codec);
	struct atmel_classd *dd = snd_soc_card_get_drvdata(card);
	const struct atmel_classd_pdata *pdata = dd->pdata;
	u32 mask, val;

	mask = CLASSD_MR_PWMTYP_MASK;
	val = pdata->pwm_type << CLASSD_MR_PWMTYP_SHIFT;

	mask |= CLASSD_MR_NON_OVERLAP_MASK;
	if (pdata->non_overlap_enable) {
		val |= (CLASSD_MR_NON_OVERLAP_EN
			<< CLASSD_MR_NON_OVERLAP_SHIFT);

		mask |= CLASSD_MR_NOVR_VAL_MASK;
		switch (pdata->non_overlap_time) {
		case 5:
			val |= (CLASSD_MR_NOVR_VAL_5NS
				<< CLASSD_MR_NOVR_VAL_SHIFT);
			break;
		case 10:
			val |= (CLASSD_MR_NOVR_VAL_10NS
				<< CLASSD_MR_NOVR_VAL_SHIFT);
			break;
		case 15:
			val |= (CLASSD_MR_NOVR_VAL_15NS
				<< CLASSD_MR_NOVR_VAL_SHIFT);
			break;
		case 20:
			val |= (CLASSD_MR_NOVR_VAL_20NS
				<< CLASSD_MR_NOVR_VAL_SHIFT);
			break;
		default:
			val |= (CLASSD_MR_NOVR_VAL_10NS
				<< CLASSD_MR_NOVR_VAL_SHIFT);
			dev_warn(codec->dev,
				"non-overlapping value %d is invalid, the default value 10 is specified\n",
				pdata->non_overlap_time);
			break;
		}
	}

	snd_soc_update_bits(codec, CLASSD_MR, mask, val);

	dev_info(codec->dev,
		"PWM modulation type is %s, non-overlapping is %s\n",
		pwm_type[pdata->pwm_type],
		pdata->non_overlap_enable?"enabled":"disabled");

	return 0;
}

static int atmel_classd_codec_resume(struct snd_soc_codec *codec)
{
	struct snd_soc_card *card = snd_soc_codec_get_drvdata(codec);
	struct atmel_classd *dd = snd_soc_card_get_drvdata(card);

	return regcache_sync(dd->regmap);
}

static struct regmap *atmel_classd_codec_get_remap(struct device *dev)
{
	return dev_get_regmap(dev, NULL);
}

static struct snd_soc_codec_driver soc_codec_dev_classd = {
	.probe		= atmel_classd_codec_probe,
	.resume		= atmel_classd_codec_resume,
	.get_regmap	= atmel_classd_codec_get_remap,
	.component_driver = {
		.controls		= atmel_classd_snd_controls,
		.num_controls		= ARRAY_SIZE(atmel_classd_snd_controls),
	},
};

/* codec dai component */
static int atmel_classd_codec_dai_startup(struct snd_pcm_substream *substream,
				struct snd_soc_dai *codec_dai)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct atmel_classd *dd = snd_soc_card_get_drvdata(rtd->card);
	int ret;

	ret = clk_prepare_enable(dd->aclk);
	if (ret)
		return ret;

	return clk_prepare_enable(dd->gclk);
}

static int atmel_classd_codec_dai_digital_mute(struct snd_soc_dai *codec_dai,
	int mute)
{
	struct snd_soc_codec *codec = codec_dai->codec;
	u32 mask, val;

	mask = CLASSD_MR_LMUTE_MASK | CLASSD_MR_RMUTE_MASK;

	if (mute)
		val = mask;
	else
		val = 0;

	snd_soc_update_bits(codec, CLASSD_MR, mask, val);

	return 0;
}

#define CLASSD_ACLK_RATE_11M2896_MPY_8 (112896 * 100 * 8)
#define CLASSD_ACLK_RATE_12M288_MPY_8  (12288 * 1000 * 8)

static struct {
	int rate;
	int sample_rate;
	int dsp_clk;
	unsigned long aclk_rate;
} const sample_rates[] = {
	{ 8000,  CLASSD_INTPMR_FRAME_8K,
	CLASSD_INTPMR_DSP_CLK_FREQ_12M288, CLASSD_ACLK_RATE_12M288_MPY_8 },
	{ 16000, CLASSD_INTPMR_FRAME_16K,
	CLASSD_INTPMR_DSP_CLK_FREQ_12M288, CLASSD_ACLK_RATE_12M288_MPY_8 },
	{ 32000, CLASSD_INTPMR_FRAME_32K,
	CLASSD_INTPMR_DSP_CLK_FREQ_12M288, CLASSD_ACLK_RATE_12M288_MPY_8 },
	{ 48000, CLASSD_INTPMR_FRAME_48K,
	CLASSD_INTPMR_DSP_CLK_FREQ_12M288, CLASSD_ACLK_RATE_12M288_MPY_8 },
	{ 96000, CLASSD_INTPMR_FRAME_96K,
	CLASSD_INTPMR_DSP_CLK_FREQ_12M288, CLASSD_ACLK_RATE_12M288_MPY_8 },
	{ 22050, CLASSD_INTPMR_FRAME_22K,
	CLASSD_INTPMR_DSP_CLK_FREQ_11M2896, CLASSD_ACLK_RATE_11M2896_MPY_8 },
	{ 44100, CLASSD_INTPMR_FRAME_44K,
	CLASSD_INTPMR_DSP_CLK_FREQ_11M2896, CLASSD_ACLK_RATE_11M2896_MPY_8 },
	{ 88200, CLASSD_INTPMR_FRAME_88K,
	CLASSD_INTPMR_DSP_CLK_FREQ_11M2896, CLASSD_ACLK_RATE_11M2896_MPY_8 },
};

static int
atmel_classd_codec_dai_hw_params(struct snd_pcm_substream *substream,
			    struct snd_pcm_hw_params *params,
			    struct snd_soc_dai *codec_dai)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct atmel_classd *dd = snd_soc_card_get_drvdata(rtd->card);
	struct snd_soc_codec *codec = codec_dai->codec;
	int fs;
	int i, best, best_val, cur_val, ret;
	u32 mask, val;

	fs = params_rate(params);

	best = 0;
	best_val = abs(fs - sample_rates[0].rate);
	for (i = 1; i < ARRAY_SIZE(sample_rates); i++) {
		/* Closest match */
		cur_val = abs(fs - sample_rates[i].rate);
		if (cur_val < best_val) {
			best = i;
			best_val = cur_val;
		}
	}

	dev_dbg(codec->dev,
		"Selected SAMPLE_RATE of %dHz, ACLK_RATE of %ldHz\n",
		sample_rates[best].rate, sample_rates[best].aclk_rate);

	clk_disable_unprepare(dd->gclk);
	clk_disable_unprepare(dd->aclk);

	ret = clk_set_rate(dd->aclk, sample_rates[best].aclk_rate);
	if (ret)
		return ret;

	mask = CLASSD_INTPMR_DSP_CLK_FREQ_MASK | CLASSD_INTPMR_FRAME_MASK;
	val = (sample_rates[best].dsp_clk << CLASSD_INTPMR_DSP_CLK_FREQ_SHIFT)
	| (sample_rates[best].sample_rate << CLASSD_INTPMR_FRAME_SHIFT);

	snd_soc_update_bits(codec, CLASSD_INTPMR, mask, val);

	ret = clk_prepare_enable(dd->aclk);
	if (ret)
		return ret;

	return clk_prepare_enable(dd->gclk);
}

static void
atmel_classd_codec_dai_shutdown(struct snd_pcm_substream *substream,
			    struct snd_soc_dai *codec_dai)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct atmel_classd *dd = snd_soc_card_get_drvdata(rtd->card);

	clk_disable_unprepare(dd->gclk);
	clk_disable_unprepare(dd->aclk);
}

static int atmel_classd_codec_dai_prepare(struct snd_pcm_substream *substream,
					struct snd_soc_dai *codec_dai)
{
	struct snd_soc_codec *codec = codec_dai->codec;

	snd_soc_update_bits(codec, CLASSD_MR,
				CLASSD_MR_LEN_MASK | CLASSD_MR_REN_MASK,
				(CLASSD_MR_LEN_DIS << CLASSD_MR_LEN_SHIFT)
				|(CLASSD_MR_REN_DIS << CLASSD_MR_REN_SHIFT));

	return 0;
}

static int atmel_classd_codec_dai_trigger(struct snd_pcm_substream *substream,
					int cmd, struct snd_soc_dai *codec_dai)
{
	struct snd_soc_codec *codec = codec_dai->codec;
	u32 mask, val;

	mask = CLASSD_MR_LEN_MASK | CLASSD_MR_REN_MASK;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		val = mask;
		break;
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		val = (CLASSD_MR_LEN_DIS << CLASSD_MR_LEN_SHIFT)
			| (CLASSD_MR_REN_DIS << CLASSD_MR_REN_SHIFT);
		break;
	default:
		return -EINVAL;
	}

	snd_soc_update_bits(codec, CLASSD_MR, mask, val);

	return 0;
}

static const struct snd_soc_dai_ops atmel_classd_codec_dai_ops = {
	.digital_mute	= atmel_classd_codec_dai_digital_mute,
	.startup	= atmel_classd_codec_dai_startup,
	.shutdown	= atmel_classd_codec_dai_shutdown,
	.hw_params	= atmel_classd_codec_dai_hw_params,
	.prepare	= atmel_classd_codec_dai_prepare,
	.trigger	= atmel_classd_codec_dai_trigger,
};

#define ATMEL_CLASSD_CODEC_DAI_NAME  "atmel-classd-hifi"

static struct snd_soc_dai_driver atmel_classd_codec_dai = {
	.name = ATMEL_CLASSD_CODEC_DAI_NAME,
	.playback = {
		.stream_name	= "Playback",
		.channels_min	= 1,
		.channels_max	= 2,
		.rates		= ATMEL_CLASSD_RATES,
		.formats	= SNDRV_PCM_FMTBIT_S16_LE,
	},
	.ops = &atmel_classd_codec_dai_ops,
};

/* ASoC sound card */
static int atmel_classd_asoc_card_init(struct device *dev,
					struct snd_soc_card *card)
{
	struct snd_soc_dai_link *dai_link;
	struct atmel_classd *dd = snd_soc_card_get_drvdata(card);

	dai_link = devm_kzalloc(dev, sizeof(*dai_link), GFP_KERNEL);
	if (!dai_link)
		return -ENOMEM;

	dai_link->name			= "CLASSD";
	dai_link->stream_name		= "CLASSD PCM";
	dai_link->codec_dai_name	= ATMEL_CLASSD_CODEC_DAI_NAME;
	dai_link->cpu_dai_name		= dev_name(dev);
	dai_link->codec_name		= dev_name(dev);
	dai_link->platform_name		= dev_name(dev);

	card->dai_link	= dai_link;
	card->num_links	= 1;
	card->name	= dd->pdata->card_name;
	card->dev	= dev;

	return 0;
};

/* regmap configuration */
static const struct reg_default atmel_classd_reg_defaults[] = {
	{ CLASSD_INTPMR,   0x00301212 },
};

#define ATMEL_CLASSD_REG_MAX    0xE4
static const struct regmap_config atmel_classd_regmap_config = {
	.reg_bits	= 32,
	.reg_stride	= 4,
	.val_bits	= 32,
	.max_register	= ATMEL_CLASSD_REG_MAX,

	.cache_type		= REGCACHE_FLAT,
	.reg_defaults		= atmel_classd_reg_defaults,
	.num_reg_defaults	= ARRAY_SIZE(atmel_classd_reg_defaults),
};

static int atmel_classd_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct atmel_classd *dd;
	struct resource *res;
	void __iomem *io_base;
	const struct atmel_classd_pdata *pdata;
	struct snd_soc_card *card;
	int ret;

	pdata = dev_get_platdata(dev);
	if (!pdata) {
		pdata = atmel_classd_dt_init(dev);
		if (IS_ERR(pdata))
			return PTR_ERR(pdata);
	}

	dd = devm_kzalloc(dev, sizeof(*dd), GFP_KERNEL);
	if (!dd)
		return -ENOMEM;

	dd->pdata = pdata;

	dd->irq = platform_get_irq(pdev, 0);
	if (dd->irq < 0) {
		ret = dd->irq;
		dev_err(dev, "failed to could not get irq: %d\n", ret);
		return ret;
	}

	dd->pclk = devm_clk_get(dev, "pclk");
	if (IS_ERR(dd->pclk)) {
		ret = PTR_ERR(dd->pclk);
		dev_err(dev, "failed to get peripheral clock: %d\n", ret);
		return ret;
	}

	dd->gclk = devm_clk_get(dev, "gclk");
	if (IS_ERR(dd->gclk)) {
		ret = PTR_ERR(dd->gclk);
		dev_err(dev, "failed to get GCK clock: %d\n", ret);
		return ret;
	}

	dd->aclk = devm_clk_get(dev, "aclk");
	if (IS_ERR(dd->aclk)) {
		ret = PTR_ERR(dd->aclk);
		dev_err(dev, "failed to get audio clock: %d\n", ret);
		return ret;
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	io_base = devm_ioremap_resource(dev, res);
	if (IS_ERR(io_base)) {
		ret =  PTR_ERR(io_base);
		dev_err(dev, "failed to remap register memory: %d\n", ret);
		return ret;
	}

	dd->phy_base = res->start;

	dd->regmap = devm_regmap_init_mmio(dev, io_base,
					&atmel_classd_regmap_config);
	if (IS_ERR(dd->regmap)) {
		ret = PTR_ERR(dd->regmap);
		dev_err(dev, "failed to init register map: %d\n", ret);
		return ret;
	}

	ret = devm_snd_soc_register_component(dev,
					&atmel_classd_cpu_dai_component,
					&atmel_classd_cpu_dai, 1);
	if (ret) {
		dev_err(dev, "could not register CPU DAI: %d\n", ret);
		return ret;
	}

	ret = devm_snd_dmaengine_pcm_register(dev,
					&atmel_classd_dmaengine_pcm_config,
					0);
	if (ret) {
		dev_err(dev, "could not register platform: %d\n", ret);
		return ret;
	}

	ret = snd_soc_register_codec(dev, &soc_codec_dev_classd,
					&atmel_classd_codec_dai, 1);
	if (ret) {
		dev_err(dev, "could not register codec: %d\n", ret);
		return ret;
	}

	/* register sound card */
	card = devm_kzalloc(dev, sizeof(*card), GFP_KERNEL);
	if (!card) {
		ret = -ENOMEM;
		goto unregister_codec;
	}

	snd_soc_card_set_drvdata(card, dd);
	platform_set_drvdata(pdev, card);

	ret = atmel_classd_asoc_card_init(dev, card);
	if (ret) {
		dev_err(dev, "failed to init sound card\n");
		goto unregister_codec;
	}

	ret = devm_snd_soc_register_card(dev, card);
	if (ret) {
		dev_err(dev, "failed to register sound card: %d\n", ret);
		goto unregister_codec;
	}

	return 0;

unregister_codec:
	snd_soc_unregister_codec(dev);
	return ret;
}

static int atmel_classd_remove(struct platform_device *pdev)
{
	snd_soc_unregister_codec(&pdev->dev);
	return 0;
}

static struct platform_driver atmel_classd_driver = {
	.driver	= {
		.name		= "atmel-classd",
		.of_match_table	= of_match_ptr(atmel_classd_of_match),
		.pm		= &snd_soc_pm_ops,
	},
	.probe	= atmel_classd_probe,
	.remove	= atmel_classd_remove,
};
module_platform_driver(atmel_classd_driver);

MODULE_DESCRIPTION("Atmel ClassD driver under ALSA SoC architecture");
MODULE_AUTHOR("Songjun Wu <songjun.wu@atmel.com>");
MODULE_LICENSE("GPL");
Commit	Line	Data
e0a25b6d SW	1	/* Atmel ALSA SoC Audio Class D Amplifier (CLASSD) driver
	2	*
	3	* Copyright (C) 2015 Atmel
	4	*
	5	* Author: Songjun Wu <songjun.wu@atmel.com>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 or later
	9	* as published by the Free Software Foundation.
	10	*/
	11
	12	#include <linux/of.h>
	13	#include <linux/clk.h>
	14	#include <linux/module.h>
	15	#include <linux/platform_device.h>
	16	#include <linux/regmap.h>
	17	#include <sound/core.h>
	18	#include <sound/dmaengine_pcm.h>
	19	#include <sound/pcm_params.h>
	20	#include <sound/tlv.h>
	21	#include "atmel-classd.h"
	22
	23	struct atmel_classd_pdata {
	24	bool non_overlap_enable;
	25	int non_overlap_time;
	26	int pwm_type;
	27	const char *card_name;
	28	};
	29
	30	struct atmel_classd {
	31	dma_addr_t phy_base;
	32	struct regmap *regmap;
	33	struct clk *pclk;
	34	struct clk *gclk;
	35	struct clk *aclk;
	36	int irq;
	37	const struct atmel_classd_pdata *pdata;
	38	};
	39
	40	#ifdef CONFIG_OF
	41	static const struct of_device_id atmel_classd_of_match[] = {
	42	{
	43	.compatible = "atmel,sama5d2-classd",
	44	}, {
	45	/* sentinel */
	46	}
	47	};
	48	MODULE_DEVICE_TABLE(of, atmel_classd_of_match);
	49
	50	static struct atmel_classd_pdata atmel_classd_dt_init(struct device dev)
	51	{
	52	struct device_node *np = dev->of_node;
	53	struct atmel_classd_pdata *pdata;
	54	const char *pwm_type;
	55	int ret;
	56
	57	if (!np) {
	58	dev_err(dev, "device node not found\n");
	59	return ERR_PTR(-EINVAL);
	60	}
	61
	62	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
	63	if (!pdata)
	64	return ERR_PTR(-ENOMEM);
65
66	ret = of_property_read_string(np, "atmel,pwm-type", &pwm_type);
67	if ((ret == 0) && (strcmp(pwm_type, "diff") == 0))
68	pdata->pwm_type = CLASSD_MR_PWMTYP_DIFF;
69	else
70	pdata->pwm_type = CLASSD_MR_PWMTYP_SINGLE;
71
72	ret = of_property_read_u32(np,
73	"atmel,non-overlap-time", &pdata->non_overlap_time);
74	if (ret)
75	pdata->non_overlap_enable = false;
76	else
77	pdata->non_overlap_enable = true;
78
79	ret = of_property_read_string(np, "atmel,model", &pdata->card_name);
80	if (ret)
81	pdata->card_name = "CLASSD";
82
83	return pdata;
84	}
85	#else
86	static inline struct atmel_classd_pdata *
87	atmel_classd_dt_init(struct device *dev)
88	{
89	return ERR_PTR(-EINVAL);
90	}
91	#endif
92
93	#define ATMEL_CLASSD_RATES (SNDRV_PCM_RATE_8000 \
94	\| SNDRV_PCM_RATE_16000 \| SNDRV_PCM_RATE_22050 \
95	\| SNDRV_PCM_RATE_32000 \| SNDRV_PCM_RATE_44100 \
96	\| SNDRV_PCM_RATE_48000 \| SNDRV_PCM_RATE_88200 \
97	\| SNDRV_PCM_RATE_96000)
98
99	static const struct snd_pcm_hardware atmel_classd_hw = {
100	.info = SNDRV_PCM_INFO_MMAP
101	\| SNDRV_PCM_INFO_MMAP_VALID
102	\| SNDRV_PCM_INFO_INTERLEAVED
103	\| SNDRV_PCM_INFO_RESUME
104	\| SNDRV_PCM_INFO_PAUSE,
105	.formats = (SNDRV_PCM_FMTBIT_S16_LE),
106	.rates = ATMEL_CLASSD_RATES,
107	.rate_min = 8000,
108	.rate_max = 96000,
07c55d39	109	.channels_min = 1,
e0a25b6d SW	110	.channels_max = 2,
	111	.buffer_bytes_max = 64 * 1024,
	112	.period_bytes_min = 256,
	113	.period_bytes_max = 32 * 1024,
	114	.periods_min = 2,
	115	.periods_max = 256,
	116	};
	117
	118	#define ATMEL_CLASSD_PREALLOC_BUF_SIZE (64 * 1024)
	119
	120	/* cpu dai component */
	121	static int atmel_classd_cpu_dai_startup(struct snd_pcm_substream *substream,
	122	struct snd_soc_dai *cpu_dai)
	123	{
	124	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	125	struct atmel_classd *dd = snd_soc_card_get_drvdata(rtd->card);
	126
	127	regmap_write(dd->regmap, CLASSD_THR, 0x0);
	128
	129	return clk_prepare_enable(dd->pclk);
	130	}
	131
	132	static void atmel_classd_cpu_dai_shutdown(struct snd_pcm_substream *substream,
	133	struct snd_soc_dai *cpu_dai)
	134	{
	135	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	136	struct atmel_classd *dd = snd_soc_card_get_drvdata(rtd->card);
	137
	138	clk_disable_unprepare(dd->pclk);
	139	}
	140
	141	static const struct snd_soc_dai_ops atmel_classd_cpu_dai_ops = {
	142	.startup = atmel_classd_cpu_dai_startup,
	143	.shutdown = atmel_classd_cpu_dai_shutdown,
	144	};
	145
	146	static struct snd_soc_dai_driver atmel_classd_cpu_dai = {
	147	.playback = {
07c55d39	148	.channels_min = 1,
e0a25b6d SW	149	.channels_max = 2,
	150	.rates = ATMEL_CLASSD_RATES,
	151	.formats = SNDRV_PCM_FMTBIT_S16_LE,},
	152	.ops = &atmel_classd_cpu_dai_ops,
	153	};
	154
	155	static const struct snd_soc_component_driver atmel_classd_cpu_dai_component = {
	156	.name = "atmel-classd",
	157	};
	158
	159	/* platform */
	160	static int
	161	atmel_classd_platform_configure_dma(struct snd_pcm_substream *substream,
	162	struct snd_pcm_hw_params *params,
	163	struct dma_slave_config *slave_config)
	164	{
	165	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	166	struct atmel_classd *dd = snd_soc_card_get_drvdata(rtd->card);
	167
	168	if (params_physical_width(params) != 16) {
	169	dev_err(rtd->platform->dev,
	170	"only supports 16-bit audio data\n");
	171	return -EINVAL;
	172	}
	173
07c55d39 SW	174	if (params_channels(params) == 1)
	175	slave_config->dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
	176	else
	177	slave_config->dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
	178
e0a25b6d SW	179	slave_config->direction = DMA_MEM_TO_DEV;
e0a25b6d SW	180	slave_config->dst_addr = dd->phy_base + CLASSD_THR;
e0a25b6d SW	181	slave_config->dst_maxburst = 1;
	182	slave_config->src_maxburst = 1;
	183	slave_config->device_fc = false;
	184
	185	return 0;
	186	}
	187
	188	static const struct snd_dmaengine_pcm_config
	189	atmel_classd_dmaengine_pcm_config = {
	190	.prepare_slave_config = atmel_classd_platform_configure_dma,
	191	.pcm_hardware = &atmel_classd_hw,
	192	.prealloc_buffer_size = ATMEL_CLASSD_PREALLOC_BUF_SIZE,
	193	};
	194
	195	/* codec */
	196	static const char * const mono_mode_text[] = {
	197	"mix", "sat", "left", "right"
	198	};
	199
	200	static SOC_ENUM_SINGLE_DECL(classd_mono_mode_enum,
	201	CLASSD_INTPMR, CLASSD_INTPMR_MONO_MODE_SHIFT,
	202	mono_mode_text);
	203
	204	static const char * const eqcfg_text[] = {
	205	"Treble-12dB", "Treble-6dB",
	206	"Medium-8dB", "Medium-3dB",
	207	"Bass-12dB", "Bass-6dB",
	208	"0 dB",
	209	"Bass+6dB", "Bass+12dB",
	210	"Medium+3dB", "Medium+8dB",
	211	"Treble+6dB", "Treble+12dB",
	212	};
	213
	214	static const unsigned int eqcfg_value[] = {
	215	CLASSD_INTPMR_EQCFG_T_CUT_12, CLASSD_INTPMR_EQCFG_T_CUT_6,
	216	CLASSD_INTPMR_EQCFG_M_CUT_8, CLASSD_INTPMR_EQCFG_M_CUT_3,
	217	CLASSD_INTPMR_EQCFG_B_CUT_12, CLASSD_INTPMR_EQCFG_B_CUT_6,
	218	CLASSD_INTPMR_EQCFG_FLAT,
	219	CLASSD_INTPMR_EQCFG_B_BOOST_6, CLASSD_INTPMR_EQCFG_B_BOOST_12,
	220	CLASSD_INTPMR_EQCFG_M_BOOST_3, CLASSD_INTPMR_EQCFG_M_BOOST_8,
	221	CLASSD_INTPMR_EQCFG_T_BOOST_6, CLASSD_INTPMR_EQCFG_T_BOOST_12,
	222	};
	223
	224	static SOC_VALUE_ENUM_SINGLE_DECL(classd_eqcfg_enum,
	225	CLASSD_INTPMR, CLASSD_INTPMR_EQCFG_SHIFT, 0xf,
	226	eqcfg_text, eqcfg_value);
	227
	228	static const DECLARE_TLV_DB_SCALE(classd_digital_tlv, -7800, 100, 1);
	229
	230	static const struct snd_kcontrol_new atmel_classd_snd_controls[] = {
	231	SOC_DOUBLE_TLV("Playback Volume", CLASSD_INTPMR,
	232	CLASSD_INTPMR_ATTL_SHIFT, CLASSD_INTPMR_ATTR_SHIFT,
	233	78, 1, classd_digital_tlv),
	234
	235	SOC_SINGLE("Deemphasis Switch", CLASSD_INTPMR,
	236	CLASSD_INTPMR_DEEMP_SHIFT, 1, 0),
	237
	238	SOC_SINGLE("Mono Switch", CLASSD_INTPMR, CLASSD_INTPMR_MONO_SHIFT, 1, 0),
	239
	240	SOC_SINGLE("Swap Switch", CLASSD_INTPMR, CLASSD_INTPMR_SWAP_SHIFT, 1, 0),
	241
	242	SOC_ENUM("Mono Mode", classd_mono_mode_enum),
	243
	244	SOC_ENUM("EQ", classd_eqcfg_enum),
245	};
246
247	static const char * const pwm_type[] = {
248	"Single ended", "Differential"
249	};
250
251	static int atmel_classd_codec_probe(struct snd_soc_codec *codec)
252	{
253	struct snd_soc_card *card = snd_soc_codec_get_drvdata(codec);
254	struct atmel_classd *dd = snd_soc_card_get_drvdata(card);
255	const struct atmel_classd_pdata *pdata = dd->pdata;
256	u32 mask, val;
257
258	mask = CLASSD_MR_PWMTYP_MASK;
259	val = pdata->pwm_type << CLASSD_MR_PWMTYP_SHIFT;
260
261	mask \|= CLASSD_MR_NON_OVERLAP_MASK;
262	if (pdata->non_overlap_enable) {
263	val \|= (CLASSD_MR_NON_OVERLAP_EN
264	<< CLASSD_MR_NON_OVERLAP_SHIFT);
265
266	mask \|= CLASSD_MR_NOVR_VAL_MASK;
267	switch (pdata->non_overlap_time) {
268	case 5:
269	val \|= (CLASSD_MR_NOVR_VAL_5NS
270	<< CLASSD_MR_NOVR_VAL_SHIFT);
271	break;
272	case 10:
273	val \|= (CLASSD_MR_NOVR_VAL_10NS
274	<< CLASSD_MR_NOVR_VAL_SHIFT);
275	break;
276	case 15:
277	val \|= (CLASSD_MR_NOVR_VAL_15NS
278	<< CLASSD_MR_NOVR_VAL_SHIFT);
279	break;
280	case 20:
281	val \|= (CLASSD_MR_NOVR_VAL_20NS
282	<< CLASSD_MR_NOVR_VAL_SHIFT);
283	break;
284	default:
285	val \|= (CLASSD_MR_NOVR_VAL_10NS
286	<< CLASSD_MR_NOVR_VAL_SHIFT);
287	dev_warn(codec->dev,
288	"non-overlapping value %d is invalid, the default value 10 is specified\n",
289	pdata->non_overlap_time);
290	break;
291	}
292	}
293
294	snd_soc_update_bits(codec, CLASSD_MR, mask, val);
295
296	dev_info(codec->dev,
297	"PWM modulation type is %s, non-overlapping is %s\n",
298	pwm_type[pdata->pwm_type],
299	pdata->non_overlap_enable?"enabled":"disabled");
300
301	return 0;
302	}
303
61abce13 QS	304	static int atmel_classd_codec_resume(struct snd_soc_codec *codec)
	305	{
	306	struct snd_soc_card *card = snd_soc_codec_get_drvdata(codec);
	307	struct atmel_classd *dd = snd_soc_card_get_drvdata(card);
	308
	309	return regcache_sync(dd->regmap);
	310	}
	311
e0a25b6d SW	312	static struct regmap atmel_classd_codec_get_remap(struct device dev)
	313	{
	314	return dev_get_regmap(dev, NULL);
	315	}
	316
	317	static struct snd_soc_codec_driver soc_codec_dev_classd = {
	318	.probe = atmel_classd_codec_probe,
61abce13	319	.resume = atmel_classd_codec_resume,
e0a25b6d	320	.get_regmap = atmel_classd_codec_get_remap,
69295df0 KM	321	.component_driver = {
	322	.controls = atmel_classd_snd_controls,
	323	.num_controls = ARRAY_SIZE(atmel_classd_snd_controls),
	324	},
e0a25b6d SW	325	};
	326
	327	/* codec dai component */
	328	static int atmel_classd_codec_dai_startup(struct snd_pcm_substream *substream,
	329	struct snd_soc_dai *codec_dai)
	330	{
	331	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	332	struct atmel_classd *dd = snd_soc_card_get_drvdata(rtd->card);
	333	int ret;
	334
	335	ret = clk_prepare_enable(dd->aclk);
	336	if (ret)
	337	return ret;
	338
	339	return clk_prepare_enable(dd->gclk);
	340	}
	341
	342	static int atmel_classd_codec_dai_digital_mute(struct snd_soc_dai *codec_dai,
	343	int mute)
	344	{
	345	struct snd_soc_codec *codec = codec_dai->codec;
	346	u32 mask, val;
	347
	348	mask = CLASSD_MR_LMUTE_MASK \| CLASSD_MR_RMUTE_MASK;
	349
	350	if (mute)
	351	val = mask;
	352	else
	353	val = 0;
	354
	355	snd_soc_update_bits(codec, CLASSD_MR, mask, val);
	356
	357	return 0;
	358	}
	359
	360	#define CLASSD_ACLK_RATE_11M2896_MPY_8 (112896 * 100 * 8)
cd3ac9af	361	#define CLASSD_ACLK_RATE_12M288_MPY_8 (12288 * 1000 * 8)
e0a25b6d SW	362
	363	static struct {
	364	int rate;
	365	int sample_rate;
	366	int dsp_clk;
	367	unsigned long aclk_rate;
	368	} const sample_rates[] = {
	369	{ 8000, CLASSD_INTPMR_FRAME_8K,
	370	CLASSD_INTPMR_DSP_CLK_FREQ_12M288, CLASSD_ACLK_RATE_12M288_MPY_8 },
	371	{ 16000, CLASSD_INTPMR_FRAME_16K,
	372	CLASSD_INTPMR_DSP_CLK_FREQ_12M288, CLASSD_ACLK_RATE_12M288_MPY_8 },
	373	{ 32000, CLASSD_INTPMR_FRAME_32K,
	374	CLASSD_INTPMR_DSP_CLK_FREQ_12M288, CLASSD_ACLK_RATE_12M288_MPY_8 },
	375	{ 48000, CLASSD_INTPMR_FRAME_48K,
	376	CLASSD_INTPMR_DSP_CLK_FREQ_12M288, CLASSD_ACLK_RATE_12M288_MPY_8 },
	377	{ 96000, CLASSD_INTPMR_FRAME_96K,
	378	CLASSD_INTPMR_DSP_CLK_FREQ_12M288, CLASSD_ACLK_RATE_12M288_MPY_8 },
	379	{ 22050, CLASSD_INTPMR_FRAME_22K,
	380	CLASSD_INTPMR_DSP_CLK_FREQ_11M2896, CLASSD_ACLK_RATE_11M2896_MPY_8 },
	381	{ 44100, CLASSD_INTPMR_FRAME_44K,
	382	CLASSD_INTPMR_DSP_CLK_FREQ_11M2896, CLASSD_ACLK_RATE_11M2896_MPY_8 },
	383	{ 88200, CLASSD_INTPMR_FRAME_88K,
	384	CLASSD_INTPMR_DSP_CLK_FREQ_11M2896, CLASSD_ACLK_RATE_11M2896_MPY_8 },
	385	};
	386
	387	static int
	388	atmel_classd_codec_dai_hw_params(struct snd_pcm_substream *substream,
	389	struct snd_pcm_hw_params *params,
	390	struct snd_soc_dai *codec_dai)
	391	{
	392	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	393	struct atmel_classd *dd = snd_soc_card_get_drvdata(rtd->card);
	394	struct snd_soc_codec *codec = codec_dai->codec;
	395	int fs;
	396	int i, best, best_val, cur_val, ret;
	397	u32 mask, val;
	398
	399	fs = params_rate(params);
	400
	401	best = 0;
	402	best_val = abs(fs - sample_rates[0].rate);
	403	for (i = 1; i < ARRAY_SIZE(sample_rates); i++) {
	404	/* Closest match */
	405	cur_val = abs(fs - sample_rates[i].rate);
	406	if (cur_val < best_val) {
	407	best = i;
	408	best_val = cur_val;
	409	}
	410	}
	411
	412	dev_dbg(codec->dev,
	413	"Selected SAMPLE_RATE of %dHz, ACLK_RATE of %ldHz\n",
	414	sample_rates[best].rate, sample_rates[best].aclk_rate);
	415
	416	clk_disable_unprepare(dd->gclk);
	417	clk_disable_unprepare(dd->aclk);
	418
	419	ret = clk_set_rate(dd->aclk, sample_rates[best].aclk_rate);
	420	if (ret)
	421	return ret;
	422
	423	mask = CLASSD_INTPMR_DSP_CLK_FREQ_MASK \| CLASSD_INTPMR_FRAME_MASK;
	424	val = (sample_rates[best].dsp_clk << CLASSD_INTPMR_DSP_CLK_FREQ_SHIFT)
	425	\| (sample_rates[best].sample_rate << CLASSD_INTPMR_FRAME_SHIFT);
426
427	snd_soc_update_bits(codec, CLASSD_INTPMR, mask, val);
428
429	ret = clk_prepare_enable(dd->aclk);
430	if (ret)
431	return ret;
432
433	return clk_prepare_enable(dd->gclk);
434	}
435
436	static void
437	atmel_classd_codec_dai_shutdown(struct snd_pcm_substream *substream,
438	struct snd_soc_dai *codec_dai)
439	{
440	struct snd_soc_pcm_runtime *rtd = substream->private_data;
441	struct atmel_classd *dd = snd_soc_card_get_drvdata(rtd->card);
442
443	clk_disable_unprepare(dd->gclk);
444	clk_disable_unprepare(dd->aclk);
445	}
446
447	static int atmel_classd_codec_dai_prepare(struct snd_pcm_substream *substream,
448	struct snd_soc_dai *codec_dai)
449	{
450	struct snd_soc_codec *codec = codec_dai->codec;
451
452	snd_soc_update_bits(codec, CLASSD_MR,
453	CLASSD_MR_LEN_MASK \| CLASSD_MR_REN_MASK,
454	(CLASSD_MR_LEN_DIS << CLASSD_MR_LEN_SHIFT)
455	\|(CLASSD_MR_REN_DIS << CLASSD_MR_REN_SHIFT));
456
457	return 0;
458	}
459
460	static int atmel_classd_codec_dai_trigger(struct snd_pcm_substream *substream,
461	int cmd, struct snd_soc_dai *codec_dai)
462	{
463	struct snd_soc_codec *codec = codec_dai->codec;
464	u32 mask, val;
465
466	mask = CLASSD_MR_LEN_MASK \| CLASSD_MR_REN_MASK;
467
468	switch (cmd) {
469	case SNDRV_PCM_TRIGGER_START:
470	case SNDRV_PCM_TRIGGER_RESUME:
471	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
472	val = mask;
473	break;
474	case SNDRV_PCM_TRIGGER_STOP:
475	case SNDRV_PCM_TRIGGER_SUSPEND:
476	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
477	val = (CLASSD_MR_LEN_DIS << CLASSD_MR_LEN_SHIFT)
478	\| (CLASSD_MR_REN_DIS << CLASSD_MR_REN_SHIFT);
479	break;
480	default:
481	return -EINVAL;
482	}
483
484	snd_soc_update_bits(codec, CLASSD_MR, mask, val);
485
486	return 0;
487	}
488
489	static const struct snd_soc_dai_ops atmel_classd_codec_dai_ops = {
490	.digital_mute = atmel_classd_codec_dai_digital_mute,
491	.startup = atmel_classd_codec_dai_startup,
492	.shutdown = atmel_classd_codec_dai_shutdown,
493	.hw_params = atmel_classd_codec_dai_hw_params,
494	.prepare = atmel_classd_codec_dai_prepare,
495	.trigger = atmel_classd_codec_dai_trigger,
496	};
497
498	#define ATMEL_CLASSD_CODEC_DAI_NAME "atmel-classd-hifi"
499
500	static struct snd_soc_dai_driver atmel_classd_codec_dai = {
501	.name = ATMEL_CLASSD_CODEC_DAI_NAME,
502	.playback = {
503	.stream_name = "Playback",
07c55d39	504	.channels_min = 1,
e0a25b6d SW	505	.channels_max = 2,
	506	.rates = ATMEL_CLASSD_RATES,
	507	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	508	},
	509	.ops = &atmel_classd_codec_dai_ops,
	510	};
	511
	512	/* ASoC sound card */
	513	static int atmel_classd_asoc_card_init(struct device *dev,
	514	struct snd_soc_card *card)
	515	{
	516	struct snd_soc_dai_link *dai_link;
	517	struct atmel_classd *dd = snd_soc_card_get_drvdata(card);
	518
	519	dai_link = devm_kzalloc(dev, sizeof(*dai_link), GFP_KERNEL);
	520	if (!dai_link)
	521	return -ENOMEM;
	522
	523	dai_link->name = "CLASSD";
	524	dai_link->stream_name = "CLASSD PCM";
	525	dai_link->codec_dai_name = ATMEL_CLASSD_CODEC_DAI_NAME;
	526	dai_link->cpu_dai_name = dev_name(dev);
	527	dai_link->codec_name = dev_name(dev);
	528	dai_link->platform_name = dev_name(dev);
	529
	530	card->dai_link = dai_link;
	531	card->num_links = 1;
	532	card->name = dd->pdata->card_name;
	533	card->dev = dev;
	534
	535	return 0;
	536	};
	537
	538	/* regmap configuration */
	539	static const struct reg_default atmel_classd_reg_defaults[] = {
	540	{ CLASSD_INTPMR, 0x00301212 },
	541	};
	542
	543	#define ATMEL_CLASSD_REG_MAX 0xE4
	544	static const struct regmap_config atmel_classd_regmap_config = {
	545	.reg_bits = 32,
	546	.reg_stride = 4,
	547	.val_bits = 32,
	548	.max_register = ATMEL_CLASSD_REG_MAX,
	549
	550	.cache_type = REGCACHE_FLAT,
	551	.reg_defaults = atmel_classd_reg_defaults,
	552	.num_reg_defaults = ARRAY_SIZE(atmel_classd_reg_defaults),
	553	};
	554
	555	static int atmel_classd_probe(struct platform_device *pdev)
	556	{
	557	struct device *dev = &pdev->dev;
	558	struct atmel_classd *dd;
	559	struct resource *res;
	560	void __iomem *io_base;
	561	const struct atmel_classd_pdata *pdata;
	562	struct snd_soc_card *card;
	563	int ret;
	564
	565	pdata = dev_get_platdata(dev);
	566	if (!pdata) {
	567	pdata = atmel_classd_dt_init(dev);
	568	if (IS_ERR(pdata))
569	return PTR_ERR(pdata);
570	}
571
572	dd = devm_kzalloc(dev, sizeof(*dd), GFP_KERNEL);
573	if (!dd)
574	return -ENOMEM;
575
576	dd->pdata = pdata;
577
578	dd->irq = platform_get_irq(pdev, 0);
579	if (dd->irq < 0) {
580	ret = dd->irq;
581	dev_err(dev, "failed to could not get irq: %d\n", ret);
582	return ret;
583	}
584
585	dd->pclk = devm_clk_get(dev, "pclk");
586	if (IS_ERR(dd->pclk)) {
587	ret = PTR_ERR(dd->pclk);
588	dev_err(dev, "failed to get peripheral clock: %d\n", ret);
589	return ret;
590	}
591
592	dd->gclk = devm_clk_get(dev, "gclk");
593	if (IS_ERR(dd->gclk)) {
594	ret = PTR_ERR(dd->gclk);
595	dev_err(dev, "failed to get GCK clock: %d\n", ret);
596	return ret;
597	}
598
599	dd->aclk = devm_clk_get(dev, "aclk");
600	if (IS_ERR(dd->aclk)) {
601	ret = PTR_ERR(dd->aclk);
602	dev_err(dev, "failed to get audio clock: %d\n", ret);
603	return ret;
604	}
605
606	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
e0a25b6d SW	607	io_base = devm_ioremap_resource(dev, res);
	608	if (IS_ERR(io_base)) {
	609	ret = PTR_ERR(io_base);
	610	dev_err(dev, "failed to remap register memory: %d\n", ret);
	611	return ret;
	612	}
	613
	614	dd->phy_base = res->start;
	615
	616	dd->regmap = devm_regmap_init_mmio(dev, io_base,
	617	&atmel_classd_regmap_config);
	618	if (IS_ERR(dd->regmap)) {
	619	ret = PTR_ERR(dd->regmap);
	620	dev_err(dev, "failed to init register map: %d\n", ret);
	621	return ret;
	622	}
	623
	624	ret = devm_snd_soc_register_component(dev,
	625	&atmel_classd_cpu_dai_component,
	626	&atmel_classd_cpu_dai, 1);
	627	if (ret) {
	628	dev_err(dev, "could not register CPU DAI: %d\n", ret);
	629	return ret;
	630	}
	631
	632	ret = devm_snd_dmaengine_pcm_register(dev,
	633	&atmel_classd_dmaengine_pcm_config,
	634	0);
	635	if (ret) {
	636	dev_err(dev, "could not register platform: %d\n", ret);
	637	return ret;
	638	}
	639
	640	ret = snd_soc_register_codec(dev, &soc_codec_dev_classd,
	641	&atmel_classd_codec_dai, 1);
	642	if (ret) {
	643	dev_err(dev, "could not register codec: %d\n", ret);
	644	return ret;
	645	}
	646
	647	/* register sound card */
	648	card = devm_kzalloc(dev, sizeof(*card), GFP_KERNEL);
32e69bad SW	649	if (!card) {
	650	ret = -ENOMEM;
	651	goto unregister_codec;
	652	}
e0a25b6d SW	653
	654	snd_soc_card_set_drvdata(card, dd);
	655	platform_set_drvdata(pdev, card);
	656
	657	ret = atmel_classd_asoc_card_init(dev, card);
	658	if (ret) {
	659	dev_err(dev, "failed to init sound card\n");
32e69bad	660	goto unregister_codec;
e0a25b6d SW	661	}
	662
	663	ret = devm_snd_soc_register_card(dev, card);
	664	if (ret) {
	665	dev_err(dev, "failed to register sound card: %d\n", ret);
32e69bad	666	goto unregister_codec;
e0a25b6d SW	667	}
	668
	669	return 0;
32e69bad SW	670
	671	unregister_codec:
	672	snd_soc_unregister_codec(dev);
	673	return ret;
e0a25b6d SW	674	}
	675
	676	static int atmel_classd_remove(struct platform_device *pdev)
	677	{
	678	snd_soc_unregister_codec(&pdev->dev);
	679	return 0;
	680	}
	681
	682	static struct platform_driver atmel_classd_driver = {
	683	.driver = {
	684	.name = "atmel-classd",
	685	.of_match_table = of_match_ptr(atmel_classd_of_match),
	686	.pm = &snd_soc_pm_ops,
	687	},
	688	.probe = atmel_classd_probe,
	689	.remove = atmel_classd_remove,
	690	};
	691	module_platform_driver(atmel_classd_driver);
	692
	693	MODULE_DESCRIPTION("Atmel ClassD driver under ALSA SoC architecture");
	694	MODULE_AUTHOR("Songjun Wu <songjun.wu@atmel.com>");
	695	MODULE_LICENSE("GPL");