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Commit a7664ab2 authored by Songjun Wu's avatar Songjun Wu Committed by Mark Brown
Browse files

ASoC: atmel-pdmic: add the Pulse Density Modulation Interface Controller 



Add driver for the Pulse Density Modulation Interface
Controller. It comes with digitallly controlled gain,
a High-Pass and a SINCC filter.

Signed-off-by: default avatarSongjun Wu <songjun.wu@atmel.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 32e69bad

sound/soc/atmel/Kconfig

+9 −0
Original line number Diff line number Diff line
@@ -68,4 +68,13 @@ config SND_ATMEL_SOC_CLASSD 
	help

	  Say Y if you want to add support for Atmel ASoC driver for boards using

	  CLASSD.



config SND_ATMEL_SOC_PDMIC

	tristate "Atmel ASoC driver for boards using PDMIC"

	depends on OF && (ARCH_AT91 || COMPILE_TEST)

	select SND_SOC_GENERIC_DMAENGINE_PCM

	select REGMAP_MMIO

	help

	  Say Y if you want to add support for Atmel ASoC driver for boards using

	  PDMIC.

endif

sound/soc/atmel/Makefile

+2 −0
Original line number Diff line number Diff line
@@ -12,8 +12,10 @@ snd-soc-sam9g20-wm8731-objs := sam9g20_wm8731.o 
snd-atmel-soc-wm8904-objs := atmel_wm8904.o

snd-soc-sam9x5-wm8731-objs := sam9x5_wm8731.o

snd-atmel-soc-classd-objs := atmel-classd.o

snd-atmel-soc-pdmic-objs := atmel-pdmic.o



obj-$(CONFIG_SND_AT91_SOC_SAM9G20_WM8731) += snd-soc-sam9g20-wm8731.o

obj-$(CONFIG_SND_ATMEL_SOC_WM8904) += snd-atmel-soc-wm8904.o

obj-$(CONFIG_SND_AT91_SOC_SAM9X5_WM8731) += snd-soc-sam9x5-wm8731.o

obj-$(CONFIG_SND_ATMEL_SOC_CLASSD) += snd-atmel-soc-classd.o

obj-$(CONFIG_SND_ATMEL_SOC_PDMIC) += snd-atmel-soc-pdmic.o

sound/soc/atmel/atmel-pdmic.c

0 → 100644
+738 −0
Original line number Diff line number Diff line 
/* Atmel PDMIC 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-pdmic.h"



struct atmel_pdmic_pdata {

	u32 mic_min_freq;

	u32 mic_max_freq;

	s32 mic_offset;

	const char *card_name;

};



struct atmel_pdmic {

	dma_addr_t phy_base;

	struct regmap *regmap;

	struct clk *pclk;

	struct clk *gclk;

	int irq;

	struct snd_pcm_substream *substream;

	const struct atmel_pdmic_pdata *pdata;

};



static const struct of_device_id atmel_pdmic_of_match[] = {

	{

		.compatible = "atmel,sama5d2-pdmic",

	}, {

		/* sentinel */

	}

};

MODULE_DEVICE_TABLE(of, atmel_pdmic_of_match);



#define PDMIC_OFFSET_MAX_VAL	S16_MAX

#define PDMIC_OFFSET_MIN_VAL	S16_MIN



static struct atmel_pdmic_pdata *atmel_pdmic_dt_init(struct device *dev)

{

	struct device_node *np = dev->of_node;

	struct atmel_pdmic_pdata *pdata;



	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);



	if (of_property_read_string(np, "atmel,model", &pdata->card_name))

		pdata->card_name = "PDMIC";



	if (of_property_read_u32(np, "atmel,mic-min-freq",

				 &pdata->mic_min_freq)) {

		dev_err(dev, "failed to get mic-min-freq\n");

		return ERR_PTR(-EINVAL);

	}



	if (of_property_read_u32(np, "atmel,mic-max-freq",

				 &pdata->mic_max_freq)) {

		dev_err(dev, "failed to get mic-max-freq\n");

		return ERR_PTR(-EINVAL);

	}



	if (pdata->mic_max_freq < pdata->mic_min_freq) {

		dev_err(dev,

			"mic-max-freq should not less than mic-min-freq\n");

		return ERR_PTR(-EINVAL);

	}



	if (of_property_read_s32(np, "atmel,mic-offset", &pdata->mic_offset))

		pdata->mic_offset = 0;



	if (pdata->mic_offset > PDMIC_OFFSET_MAX_VAL) {

		dev_warn(dev,

			 "mic-offset value %d is larger than the max value %d, the max value is specified\n",

			 pdata->mic_offset, PDMIC_OFFSET_MAX_VAL);

		pdata->mic_offset = PDMIC_OFFSET_MAX_VAL;

	} else if (pdata->mic_offset < PDMIC_OFFSET_MIN_VAL) {

		dev_warn(dev,

			 "mic-offset value %d is less than the min value %d, the min value is specified\n",

			 pdata->mic_offset, PDMIC_OFFSET_MIN_VAL);

		pdata->mic_offset = PDMIC_OFFSET_MIN_VAL;

	}



	return pdata;

}



/* cpu dai component */

static int atmel_pdmic_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_pdmic *dd = snd_soc_card_get_drvdata(rtd->card);

	int ret;



	ret = clk_prepare_enable(dd->gclk);

	if (ret)

		return ret;



	ret =  clk_prepare_enable(dd->pclk);

	if (ret)

		return ret;



	/* Clear all bits in the Control Register(PDMIC_CR) */

	regmap_write(dd->regmap, PDMIC_CR, 0);



	dd->substream = substream;



	/* Enable the overrun error interrupt */

	regmap_write(dd->regmap, PDMIC_IER, PDMIC_IER_OVRE);



	return 0;

}



static void atmel_pdmic_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_pdmic *dd = snd_soc_card_get_drvdata(rtd->card);



	/* Disable the overrun error interrupt */

	regmap_write(dd->regmap, PDMIC_IDR, PDMIC_IDR_OVRE);



	clk_disable_unprepare(dd->gclk);

	clk_disable_unprepare(dd->pclk);

}



static int atmel_pdmic_cpu_dai_prepare(struct snd_pcm_substream *substream,

					struct snd_soc_dai *cpu_dai)

{

	struct snd_soc_pcm_runtime *rtd = substream->private_data;

	struct atmel_pdmic *dd = snd_soc_card_get_drvdata(rtd->card);

	u32 val;



	/* Clean the PDMIC Converted Data Register */

	return regmap_read(dd->regmap, PDMIC_CDR, &val);

}



static const struct snd_soc_dai_ops atmel_pdmic_cpu_dai_ops = {

	.startup	= atmel_pdmic_cpu_dai_startup,

	.shutdown	= atmel_pdmic_cpu_dai_shutdown,

	.prepare	= atmel_pdmic_cpu_dai_prepare,

};



#define ATMEL_PDMIC_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE)



static struct snd_soc_dai_driver atmel_pdmic_cpu_dai = {

	.capture = {

		.channels_min	= 1,

		.channels_max	= 1,

		.rates		= SNDRV_PCM_RATE_KNOT,

		.formats	= ATMEL_PDMIC_FORMATS,},

	.ops = &atmel_pdmic_cpu_dai_ops,

};



static const struct snd_soc_component_driver atmel_pdmic_cpu_dai_component = {

	.name = "atmel-pdmic",

};



/* platform */

#define ATMEL_PDMIC_MAX_BUF_SIZE  (64 * 1024)

#define ATMEL_PDMIC_PREALLOC_BUF_SIZE  ATMEL_PDMIC_MAX_BUF_SIZE



static const struct snd_pcm_hardware atmel_pdmic_hw = {

	.info			= SNDRV_PCM_INFO_MMAP

				| SNDRV_PCM_INFO_MMAP_VALID

				| SNDRV_PCM_INFO_INTERLEAVED

				| SNDRV_PCM_INFO_RESUME

				| SNDRV_PCM_INFO_PAUSE,

	.formats		= ATMEL_PDMIC_FORMATS,

	.buffer_bytes_max	= ATMEL_PDMIC_MAX_BUF_SIZE,

	.period_bytes_min	= 256,

	.period_bytes_max	= 32 * 1024,

	.periods_min		= 2,

	.periods_max		= 256,

};



static int

atmel_pdmic_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_pdmic *dd = snd_soc_card_get_drvdata(rtd->card);

	int ret;



	ret = snd_hwparams_to_dma_slave_config(substream, params,

					       slave_config);

	if (ret) {

		dev_err(rtd->platform->dev,

			"hw params to dma slave configure failed\n");

		return ret;

	}



	slave_config->src_addr		= dd->phy_base + PDMIC_CDR;

	slave_config->src_maxburst	= 1;

	slave_config->dst_maxburst	= 1;



	return 0;

}



static const struct snd_dmaengine_pcm_config

atmel_pdmic_dmaengine_pcm_config = {

	.prepare_slave_config	= atmel_pdmic_platform_configure_dma,

	.pcm_hardware		= &atmel_pdmic_hw,

	.prealloc_buffer_size	= ATMEL_PDMIC_PREALLOC_BUF_SIZE,

};



/* codec */

/* Mic Gain = dgain * 2^(-scale) */

struct mic_gain {

	unsigned int dgain;

	unsigned int scale;

};



/* range from -90 dB to 90 dB */

static const struct mic_gain mic_gain_table[] = {

{    1, 15}, {    1, 14},                           /* -90, -84 dB */

{    3, 15}, {    1, 13}, {    3, 14}, {    1, 12}, /* -81, -78, -75, -72 dB */

{    5, 14}, {   13, 15},                           /* -70, -68 dB */

{    9, 14}, {   21, 15}, {   23, 15}, {   13, 14}, /* -65 ~ -62 dB */

{   29, 15}, {   33, 15}, {   37, 15}, {   41, 15}, /* -61 ~ -58 dB */

{   23, 14}, {   13, 13}, {   58, 15}, {   65, 15}, /* -57 ~ -54 dB */

{   73, 15}, {   41, 14}, {   23, 13}, {   13, 12}, /* -53 ~ -50 dB */

{   29, 13}, {   65, 14}, {   73, 14}, {   41, 13}, /* -49 ~ -46 dB */

{   23, 12}, {  207, 15}, {   29, 12}, {   65, 13}, /* -45 ~ -42 dB */

{   73, 13}, {   41, 12}, {   23, 11}, {  413, 15}, /* -41 ~ -38 dB */

{  463, 15}, {  519, 15}, {  583, 15}, {  327, 14}, /* -37 ~ -34 dB */

{  367, 14}, {  823, 15}, {  231, 13}, { 1036, 15}, /* -33 ~ -30 dB */

{ 1163, 15}, { 1305, 15}, {  183, 12}, { 1642, 15}, /* -29 ~ -26 dB */

{ 1843, 15}, { 2068, 15}, {  145, 11}, { 2603, 15}, /* -25 ~ -22 dB */

{  365, 12}, { 3277, 15}, { 3677, 15}, { 4125, 15}, /* -21 ~ -18 dB */

{ 4629, 15}, { 5193, 15}, { 5827, 15}, { 3269, 14}, /* -17 ~ -14 dB */

{  917, 12}, { 8231, 15}, { 9235, 15}, { 5181, 14}, /* -13 ~ -10 dB */

{11627, 15}, {13045, 15}, {14637, 15}, {16423, 15}, /*  -9 ~ -6 dB */

{18427, 15}, {20675, 15}, { 5799, 13}, {26029, 15}, /*  -5 ~ -2 dB */

{ 7301, 13}, {    1,  0}, {18383, 14}, {10313, 13}, /*  -1 ~ 2 dB */

{23143, 14}, {25967, 14}, {29135, 14}, {16345, 13}, /*   3 ~ 6 dB */

{ 4585, 11}, {20577, 13}, { 1443,  9}, {25905, 13}, /*   7 ~ 10 dB */

{14533, 12}, { 8153, 11}, { 2287,  9}, {20529, 12}, /*  11 ~ 14 dB */

{11517, 11}, { 6461, 10}, {28997, 12}, { 4067,  9}, /*  15 ~ 18 dB */

{18253, 11}, {   10,  0}, {22979, 11}, {25783, 11}, /*  19 ~ 22 dB */

{28929, 11}, {32459, 11}, { 9105,  9}, {20431, 10}, /*  23 ~ 26 dB */

{22925, 10}, {12861,  9}, { 7215,  8}, {16191,  9}, /*  27 ~ 30 dB */

{ 9083,  8}, {20383,  9}, {11435,  8}, { 6145,  7}, /*  31 ~ 34 dB */

{ 3599,  6}, {32305,  9}, {18123,  8}, {20335,  8}, /*  35 ~ 38 dB */

{  713,  3}, {  100,  0}, { 7181,  6}, { 8057,  6}, /*  39 ~ 42 dB */

{  565,  2}, {20287,  7}, {11381,  6}, {25539,  7}, /*  43 ~ 46 dB */

{ 1791,  3}, { 4019,  4}, { 9019,  5}, {20239,  6}, /*  47 ~ 50 dB */

{ 5677,  4}, {25479,  6}, { 7147,  4}, { 8019,  4}, /*  51 ~ 54 dB */

{17995,  5}, {20191,  5}, {11327,  4}, {12709,  4}, /*  55 ~ 58 dB */

{ 3565,  2}, { 1000,  0}, { 1122,  0}, { 1259,  0}, /*  59 ~ 62 dB */

{ 2825,  1}, {12679,  3}, { 7113,  2}, { 7981,  2}, /*  63 ~ 66 dB */

{ 8955,  2}, {20095,  3}, {22547,  3}, {12649,  2}, /*  67 ~ 70 dB */

{28385,  3}, { 3981,  0}, {17867,  2}, {20047,  2}, /*  71 ~ 74 dB */

{11247,  1}, {12619,  1}, {14159,  1}, {31773,  2}, /*  75 ~ 78 dB */

{17825,  1}, {10000,  0}, {11220,  0}, {12589,  0}, /*  79 ~ 82 dB */

{28251,  1}, {15849,  0}, {17783,  0}, {19953,  0}, /*  83 ~ 86 dB */

{22387,  0}, {25119,  0}, {28184,  0}, {31623,  0}, /*  87 ~ 90 dB */

};



static const DECLARE_TLV_DB_RANGE(mic_gain_tlv,

	0, 1, TLV_DB_SCALE_ITEM(-9000, 600, 0),

	2, 5, TLV_DB_SCALE_ITEM(-8100, 300, 0),

	6, 7, TLV_DB_SCALE_ITEM(-7000, 200, 0),

	8, ARRAY_SIZE(mic_gain_table)-1, TLV_DB_SCALE_ITEM(-6500, 100, 0),

);



int pdmic_get_mic_volsw(struct snd_kcontrol *kcontrol,

	struct snd_ctl_elem_value *ucontrol)

{

	struct snd_soc_codec *codec = snd_soc_kcontrol_codec(kcontrol);

	unsigned int dgain_val, scale_val;

	int i;



	dgain_val = (snd_soc_read(codec, PDMIC_DSPR1) & PDMIC_DSPR1_DGAIN_MASK)

		    >> PDMIC_DSPR1_DGAIN_SHIFT;



	scale_val = (snd_soc_read(codec, PDMIC_DSPR0) & PDMIC_DSPR0_SCALE_MASK)

		    >> PDMIC_DSPR0_SCALE_SHIFT;



	for (i = 0; i < ARRAY_SIZE(mic_gain_table); i++) {

		if ((mic_gain_table[i].dgain == dgain_val) &&

		    (mic_gain_table[i].scale == scale_val))

			ucontrol->value.integer.value[0] = i;

	}



	return 0;

}



static int pdmic_put_mic_volsw(struct snd_kcontrol *kcontrol,

	struct snd_ctl_elem_value *ucontrol)

{

	struct soc_mixer_control *mc =

		(struct soc_mixer_control *)kcontrol->private_value;

	struct snd_soc_codec *codec = snd_soc_kcontrol_codec(kcontrol);

	int max = mc->max;

	unsigned int val;

	int ret;



	val = ucontrol->value.integer.value[0];



	if (val > max)

		return -EINVAL;



	ret = snd_soc_update_bits(codec, PDMIC_DSPR1, PDMIC_DSPR1_DGAIN_MASK,

			 mic_gain_table[val].dgain << PDMIC_DSPR1_DGAIN_SHIFT);

	if (ret < 0)

		return ret;



	ret = snd_soc_update_bits(codec, PDMIC_DSPR0, PDMIC_DSPR0_SCALE_MASK,

			 mic_gain_table[val].scale << PDMIC_DSPR0_SCALE_SHIFT);

	if (ret < 0)

		return ret;



	return 0;

}



static const struct snd_kcontrol_new atmel_pdmic_snd_controls[] = {

SOC_SINGLE_EXT_TLV("Mic Capture Volume", PDMIC_DSPR1, PDMIC_DSPR1_DGAIN_SHIFT,

		   ARRAY_SIZE(mic_gain_table)-1, 0,

		   pdmic_get_mic_volsw, pdmic_put_mic_volsw, mic_gain_tlv),



SOC_SINGLE("High Pass Filter Switch", PDMIC_DSPR0,

	   PDMIC_DSPR0_HPFBYP_SHIFT, 1, 1),



SOC_SINGLE("SINCC Filter Switch", PDMIC_DSPR0, PDMIC_DSPR0_SINBYP_SHIFT, 1, 1),

};



static int atmel_pdmic_codec_probe(struct snd_soc_codec *codec)

{

	struct snd_soc_card *card = snd_soc_codec_get_drvdata(codec);

	struct atmel_pdmic *dd = snd_soc_card_get_drvdata(card);



	snd_soc_update_bits(codec, PDMIC_DSPR1, PDMIC_DSPR1_OFFSET_MASK,

		     (u32)(dd->pdata->mic_offset << PDMIC_DSPR1_OFFSET_SHIFT));



	return 0;

}



static struct snd_soc_codec_driver soc_codec_dev_pdmic = {

	.probe		= atmel_pdmic_codec_probe,

	.controls	= atmel_pdmic_snd_controls,

	.num_controls	= ARRAY_SIZE(atmel_pdmic_snd_controls),

};



/* codec dai component */

#define PDMIC_MR_PRESCAL_MAX_VAL 127



static int

atmel_pdmic_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_pdmic *dd = snd_soc_card_get_drvdata(rtd->card);

	struct snd_soc_codec *codec = codec_dai->codec;

	unsigned int rate_min = substream->runtime->hw.rate_min;

	unsigned int rate_max = substream->runtime->hw.rate_max;

	int fs = params_rate(params);

	int bits = params_width(params);

	unsigned long pclk_rate, gclk_rate;

	unsigned int f_pdmic;

	u32 mr_val, dspr0_val, pclk_prescal, gclk_prescal;



	if (params_channels(params) != 1) {

		dev_err(codec->dev,

			"only supports one channel\n");

		return -EINVAL;

	}



	if ((fs < rate_min) || (fs > rate_max)) {

		dev_err(codec->dev,

			"sample rate is %dHz, min rate is %dHz, max rate is %dHz\n",

			fs, rate_min, rate_max);



		return -EINVAL;

	}



	switch (bits) {

	case 16:

		dspr0_val = (PDMIC_DSPR0_SIZE_16_BITS

			     << PDMIC_DSPR0_SIZE_SHIFT);

		break;

	case 32:

		dspr0_val = (PDMIC_DSPR0_SIZE_32_BITS

			     << PDMIC_DSPR0_SIZE_SHIFT);

		break;

	default:

		return -EINVAL;

	}



	if ((fs << 7) > (rate_max << 6)) {

		f_pdmic = fs << 6;

		dspr0_val |= PDMIC_DSPR0_OSR_64 << PDMIC_DSPR0_OSR_SHIFT;

	} else {

		f_pdmic = fs << 7;

		dspr0_val |= PDMIC_DSPR0_OSR_128 << PDMIC_DSPR0_OSR_SHIFT;

	}



	pclk_rate = clk_get_rate(dd->pclk);

	gclk_rate = clk_get_rate(dd->gclk);



	/* PRESCAL = SELCK/(2*f_pdmic) - 1*/

	pclk_prescal = (u32)(pclk_rate/(f_pdmic << 1)) - 1;

	gclk_prescal = (u32)(gclk_rate/(f_pdmic << 1)) - 1;



	if ((pclk_prescal > PDMIC_MR_PRESCAL_MAX_VAL) ||

	    (gclk_rate/((gclk_prescal + 1) << 1) <

	     pclk_rate/((pclk_prescal + 1) << 1))) {

		mr_val = gclk_prescal << PDMIC_MR_PRESCAL_SHIFT;

		mr_val |= PDMIC_MR_CLKS_GCK << PDMIC_MR_CLKS_SHIFT;

	} else {

		mr_val = pclk_prescal << PDMIC_MR_PRESCAL_SHIFT;

		mr_val |= PDMIC_MR_CLKS_PCK << PDMIC_MR_CLKS_SHIFT;

	}



	snd_soc_update_bits(codec, PDMIC_MR,

		PDMIC_MR_PRESCAL_MASK | PDMIC_MR_CLKS_MASK, mr_val);



	snd_soc_update_bits(codec, PDMIC_DSPR0,

		PDMIC_DSPR0_OSR_MASK | PDMIC_DSPR0_SIZE_MASK, dspr0_val);



	return 0;

}



static int atmel_pdmic_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, PDMIC_CR, PDMIC_CR_ENPDM_MASK,

			    PDMIC_CR_ENPDM_DIS << PDMIC_CR_ENPDM_SHIFT);



	return 0;

}



static int atmel_pdmic_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 val;



	switch (cmd) {

	case SNDRV_PCM_TRIGGER_START:

	case SNDRV_PCM_TRIGGER_RESUME:

	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:

		val = PDMIC_CR_ENPDM_EN << PDMIC_CR_ENPDM_SHIFT;

		break;

	case SNDRV_PCM_TRIGGER_STOP:

	case SNDRV_PCM_TRIGGER_SUSPEND:

	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:

		val = PDMIC_CR_ENPDM_DIS << PDMIC_CR_ENPDM_SHIFT;

		break;

	default:

		return -EINVAL;

	}



	snd_soc_update_bits(codec, PDMIC_CR, PDMIC_CR_ENPDM_MASK, val);



	return 0;

}



static const struct snd_soc_dai_ops atmel_pdmic_codec_dai_ops = {

	.hw_params	= atmel_pdmic_codec_dai_hw_params,

	.prepare	= atmel_pdmic_codec_dai_prepare,

	.trigger	= atmel_pdmic_codec_dai_trigger,

};



#define ATMEL_PDMIC_CODEC_DAI_NAME  "atmel-pdmic-hifi"



static struct snd_soc_dai_driver atmel_pdmic_codec_dai = {

	.name = ATMEL_PDMIC_CODEC_DAI_NAME,

	.capture = {

		.stream_name	= "Capture",

		.channels_min	= 1,

		.channels_max	= 1,

		.rates		= SNDRV_PCM_RATE_KNOT,

		.formats	= ATMEL_PDMIC_FORMATS,

	},

	.ops = &atmel_pdmic_codec_dai_ops,

};



/* ASoC sound card */

static int atmel_pdmic_asoc_card_init(struct device *dev,

				struct snd_soc_card *card)

{

	struct snd_soc_dai_link *dai_link;

	struct atmel_pdmic *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			= "PDMIC";

	dai_link->stream_name		= "PDMIC PCM";

	dai_link->codec_dai_name	= ATMEL_PDMIC_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;

}



static void atmel_pdmic_get_sample_rate(struct atmel_pdmic *dd,

	unsigned int *rate_min, unsigned int *rate_max)

{

	u32 mic_min_freq = dd->pdata->mic_min_freq;

	u32 mic_max_freq = dd->pdata->mic_max_freq;

	u32 clk_max_rate = (u32)(clk_get_rate(dd->pclk) >> 1);

	u32 clk_min_rate = (u32)(clk_get_rate(dd->gclk) >> 8);



	if (mic_max_freq > clk_max_rate)

		mic_max_freq = clk_max_rate;



	if (mic_min_freq < clk_min_rate)

		mic_min_freq = clk_min_rate;



	*rate_min = DIV_ROUND_CLOSEST(mic_min_freq, 128);

	*rate_max = mic_max_freq >> 6;

}



/* PDMIC interrupt handler */

static irqreturn_t atmel_pdmic_interrupt(int irq, void *dev_id)

{

	struct atmel_pdmic *dd = (struct atmel_pdmic *)dev_id;

	u32 pdmic_isr;

	irqreturn_t ret = IRQ_NONE;



	regmap_read(dd->regmap, PDMIC_ISR, &pdmic_isr);



	if (pdmic_isr & PDMIC_ISR_OVRE) {

		regmap_update_bits(dd->regmap, PDMIC_CR, PDMIC_CR_ENPDM_MASK,

				   PDMIC_CR_ENPDM_DIS << PDMIC_CR_ENPDM_SHIFT);



		snd_pcm_stop_xrun(dd->substream);



		ret = IRQ_HANDLED;

	}



	return ret;

}



/* regmap configuration */

#define ATMEL_PDMIC_REG_MAX    0x124

static const struct regmap_config atmel_pdmic_regmap_config = {

	.reg_bits	= 32,

	.reg_stride	= 4,

	.val_bits	= 32,

	.max_register	= ATMEL_PDMIC_REG_MAX,

};



static int atmel_pdmic_probe(struct platform_device *pdev)

{

	struct device *dev = &pdev->dev;

	struct atmel_pdmic *dd;

	struct resource *res;

	void __iomem *io_base;

	const struct atmel_pdmic_pdata *pdata;

	struct snd_soc_card *card;

	unsigned int rate_min, rate_max;

	int ret;



	pdata = atmel_pdmic_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: %d\n", ret);

		return ret;

	}



	/* The gclk clock frequency must always be tree times

	 * lower than the pclk clock frequency

	 */

	ret = clk_set_rate(dd->gclk, clk_get_rate(dd->pclk)/3);

	if (ret) {

		dev_err(dev, "failed to set GCK clock rate: %d\n", ret);

		return ret;

	}



	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	if (!res) {

		dev_err(dev, "no memory resource\n");

		return -ENXIO;

	}



	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_pdmic_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_request_irq(dev, dd->irq, atmel_pdmic_interrupt, 0,

				"PDMIC", (void *)dd);

	if (ret < 0) {

		dev_err(dev, "can't register ISR for IRQ %u (ret=%i)\n",

			dd->irq, ret);

		return ret;

	}



	/* Get the minimal and maximal sample rate that micphone supports */

	atmel_pdmic_get_sample_rate(dd, &rate_min, &rate_max);



	/* register cpu dai */

	atmel_pdmic_cpu_dai.capture.rate_min = rate_min;

	atmel_pdmic_cpu_dai.capture.rate_max = rate_max;

	ret = devm_snd_soc_register_component(dev,

					      &atmel_pdmic_cpu_dai_component,

					      &atmel_pdmic_cpu_dai, 1);

	if (ret) {

		dev_err(dev, "could not register CPU DAI: %d\n", ret);

		return ret;

	}



	/* register platform */

	ret = devm_snd_dmaengine_pcm_register(dev,

					     &atmel_pdmic_dmaengine_pcm_config,

					     0);

	if (ret) {

		dev_err(dev, "could not register platform: %d\n", ret);

		return ret;

	}



	/* register codec and codec dai */

	atmel_pdmic_codec_dai.capture.rate_min = rate_min;

	atmel_pdmic_codec_dai.capture.rate_max = rate_max;

	ret = snd_soc_register_codec(dev, &soc_codec_dev_pdmic,

				     &atmel_pdmic_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_pdmic_asoc_card_init(dev, card);

	if (ret) {

		dev_err(dev, "failed to init sound card: %d\n", ret);

		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_pdmic_remove(struct platform_device *pdev)

{

	snd_soc_unregister_codec(&pdev->dev);

	return 0;

}



static struct platform_driver atmel_pdmic_driver = {

	.driver	= {

		.name		= "atmel-pdmic",

		.of_match_table	= of_match_ptr(atmel_pdmic_of_match),

		.pm		= &snd_soc_pm_ops,

	},

	.probe	= atmel_pdmic_probe,

	.remove	= atmel_pdmic_remove,

};

module_platform_driver(atmel_pdmic_driver);



MODULE_DESCRIPTION("Atmel PDMIC driver under ALSA SoC architecture");

MODULE_AUTHOR("Songjun Wu <songjun.wu@atmel.com>");

MODULE_LICENSE("GPL v2");

sound/soc/atmel/atmel-pdmic.h

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#ifndef __ATMEL_PDMIC_H_

#define __ATMEL_PDMIC_H_



#include <linux/bitops.h>



#define PDMIC_CR	0x00000000



#define PDMIC_CR_SWRST		0x1

#define PDMIC_CR_SWRST_MASK	BIT(0)

#define PDMIC_CR_SWRST_SHIFT	(0)



#define PDMIC_CR_ENPDM_DIS	0x0

#define PDMIC_CR_ENPDM_EN	0x1

#define PDMIC_CR_ENPDM_MASK	BIT(4)

#define PDMIC_CR_ENPDM_SHIFT	(4)



#define PDMIC_MR	0x00000004



#define PDMIC_MR_CLKS_PCK	0x0

#define PDMIC_MR_CLKS_GCK	0x1

#define PDMIC_MR_CLKS_MASK	BIT(4)

#define PDMIC_MR_CLKS_SHIFT	(4)



#define PDMIC_MR_PRESCAL_MASK	GENMASK(14, 8)

#define PDMIC_MR_PRESCAL_SHIFT	(8)



#define PDMIC_CDR	0x00000014



#define PDMIC_IER	0x00000018

#define PDMIC_IER_OVRE			BIT(25)



#define PDMIC_IDR	0x0000001c

#define PDMIC_IDR_OVRE			BIT(25)



#define PDMIC_IMR	0x00000020



#define PDMIC_ISR	0x00000024

#define PDMIC_ISR_OVRE			BIT(25)



#define PDMIC_DSPR0	0x00000058



#define PDMIC_DSPR0_HPFBYP_DIS		0x1

#define PDMIC_DSPR0_HPFBYP_EN		0x0

#define PDMIC_DSPR0_HPFBYP_MASK		BIT(1)

#define PDMIC_DSPR0_HPFBYP_SHIFT	(1)



#define PDMIC_DSPR0_SINBYP_DIS		0x1

#define PDMIC_DSPR0_SINBYP_EN		0x0

#define PDMIC_DSPR0_SINBYP_MASK		BIT(2)

#define PDMIC_DSPR0_SINBYP_SHIFT	(2)



#define PDMIC_DSPR0_SIZE_16_BITS	0x0

#define PDMIC_DSPR0_SIZE_32_BITS	0x1

#define PDMIC_DSPR0_SIZE_MASK		BIT(3)

#define PDMIC_DSPR0_SIZE_SHIFT		(3)



#define PDMIC_DSPR0_OSR_128		0x0

#define PDMIC_DSPR0_OSR_64		0x1

#define PDMIC_DSPR0_OSR_MASK		GENMASK(6, 4)

#define PDMIC_DSPR0_OSR_SHIFT		(4)



#define PDMIC_DSPR0_SCALE_MASK		GENMASK(11, 8)

#define PDMIC_DSPR0_SCALE_SHIFT		(8)



#define PDMIC_DSPR0_SHIFT_MASK		GENMASK(15, 12)

#define PDMIC_DSPR0_SHIFT_SHIFT		(12)



#define PDMIC_DSPR1	0x0000005c



#define PDMIC_DSPR1_DGAIN_MASK		GENMASK(14, 0)

#define PDMIC_DSPR1_DGAIN_SHIFT		(0)



#define PDMIC_DSPR1_OFFSET_MASK		GENMASK(31, 16)

#define PDMIC_DSPR1_OFFSET_SHIFT	(16)



#define PDMIC_WPMR	0x000000e4



#define PDMIC_WPSR	0x000000e8



#endif