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Commit c3a0003a authored by Arnaud Pouliquen's avatar Arnaud Pouliquen Committed by Mark Brown
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ASoC: sti: Add CPU DAI driver for capture 



Add code to manage Uniperipheral reader IP instances.
These DAIs are dedicated to capture and support I2S and IEC modes.

Signed-off-by: default avatarArnaud Pouliquen <arnaud.pouliquen@st.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent ed6c75f2

sound/soc/sti/uniperif.h

+3 −0
Original line number Diff line number Diff line
@@ -1212,4 +1212,7 @@ int uni_player_init(struct platform_device *pdev, 
		    struct uniperif *uni_player);

int uni_player_resume(struct uniperif *player);



/* uniperiph reader */

int uni_reader_init(struct platform_device *pdev,

		    struct uniperif *uni_reader);

#endif

sound/soc/sti/uniperif_reader.c

0 → 100644
+362 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) STMicroelectronics SA 2015

 * Authors: Arnaud Pouliquen <arnaud.pouliquen@st.com>

 *          for STMicroelectronics.

 * License terms:  GNU General Public License (GPL), version 2

 */



#include <linux/clk.h>

#include <linux/delay.h>

#include <linux/io.h>



#include <sound/soc.h>



#include "uniperif.h"



/*

 * Note: snd_pcm_hardware is linked to DMA controller but is declared here to

 * integrate unireader capability in term of rate and supported channels

 */

const struct snd_pcm_hardware uni_reader_pcm_hw = {

	.info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |

		SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_MMAP |

		SNDRV_PCM_INFO_MMAP_VALID,

	.formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S16_LE,



	.rates = SNDRV_PCM_RATE_CONTINUOUS,

	.rate_min = 8000,

	.rate_max = 96000,



	.channels_min = 2,

	.channels_max = 8,



	.periods_min = 2,

	.periods_max = 48,



	.period_bytes_min = 128,

	.period_bytes_max = 64 * PAGE_SIZE,

	.buffer_bytes_max = 256 * PAGE_SIZE

};



/*

 * uni_reader_irq_handler

 * In case of error audio stream is stopped; stop action is protected via PCM

 * stream lock  to avoid race condition with trigger callback.

 */

static irqreturn_t uni_reader_irq_handler(int irq, void *dev_id)

{

	irqreturn_t ret = IRQ_NONE;

	struct uniperif *reader = dev_id;

	unsigned int status;



	if (reader->state == UNIPERIF_STATE_STOPPED) {

		/* Unexpected IRQ: do nothing */

		dev_warn(reader->dev, "unexpected IRQ ");

		return IRQ_HANDLED;

	}



	/* Get interrupt status & clear them immediately */

	status = GET_UNIPERIF_ITS(reader);

	SET_UNIPERIF_ITS_BCLR(reader, status);



	/* Check for fifo overflow error */

	if (unlikely(status & UNIPERIF_ITS_FIFO_ERROR_MASK(reader))) {

		dev_err(reader->dev, "FIFO error detected");



		snd_pcm_stream_lock(reader->substream);

		snd_pcm_stop(reader->substream, SNDRV_PCM_STATE_XRUN);

		snd_pcm_stream_unlock(reader->substream);



		return IRQ_HANDLED;

	}



	return ret;

}



static int uni_reader_prepare(struct snd_pcm_substream *substream,

			      struct snd_soc_dai *dai)

{

	struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai);

	struct uniperif *reader = priv->dai_data.uni;

	struct snd_pcm_runtime *runtime = substream->runtime;

	int transfer_size, trigger_limit;

	int slot_width;

	int count = 10;



	/* The reader should be stopped */

	if (reader->state != UNIPERIF_STATE_STOPPED) {

		dev_err(reader->dev, "%s: invalid reader state %d", __func__,

			reader->state);

		return -EINVAL;

	}



	/* Calculate transfer size (in fifo cells and bytes) for frame count */

	transfer_size = runtime->channels * UNIPERIF_FIFO_FRAMES;



	/* Calculate number of empty cells available before asserting DREQ */

	if (reader->ver < SND_ST_UNIPERIF_VERSION_UNI_PLR_TOP_1_0)

		trigger_limit = UNIPERIF_FIFO_SIZE - transfer_size;

	else

		/*

		 * Since SND_ST_UNIPERIF_VERSION_UNI_PLR_TOP_1_0

		 * FDMA_TRIGGER_LIMIT also controls when the state switches

		 * from OFF or STANDBY to AUDIO DATA.

		 */

		trigger_limit = transfer_size;



	/* Trigger limit must be an even number */

	if ((!trigger_limit % 2) ||

	    (trigger_limit != 1 && transfer_size % 2) ||

	    (trigger_limit > UNIPERIF_CONFIG_DMA_TRIG_LIMIT_MASK(reader))) {

		dev_err(reader->dev, "invalid trigger limit %d", trigger_limit);

		return -EINVAL;

	}



	SET_UNIPERIF_CONFIG_DMA_TRIG_LIMIT(reader, trigger_limit);



	switch (reader->daifmt & SND_SOC_DAIFMT_INV_MASK) {

	case SND_SOC_DAIFMT_IB_IF:

	case SND_SOC_DAIFMT_NB_IF:

		SET_UNIPERIF_I2S_FMT_LR_POL_HIG(reader);

		break;

	default:

		SET_UNIPERIF_I2S_FMT_LR_POL_LOW(reader);

	}



	/* Force slot width to 32 in I2S mode */

	if ((reader->daifmt & SND_SOC_DAIFMT_FORMAT_MASK)

		== SND_SOC_DAIFMT_I2S) {

		slot_width = 32;

	} else {

		switch (runtime->format) {

		case SNDRV_PCM_FORMAT_S16_LE:

			slot_width = 16;

			break;

		default:

			slot_width = 32;

			break;

		}

	}



	/* Number of bits per subframe (i.e one channel sample) on input. */

	switch (slot_width) {

	case 32:

		SET_UNIPERIF_I2S_FMT_NBIT_32(reader);

		SET_UNIPERIF_I2S_FMT_DATA_SIZE_32(reader);

		break;

	case 16:

		SET_UNIPERIF_I2S_FMT_NBIT_16(reader);

		SET_UNIPERIF_I2S_FMT_DATA_SIZE_16(reader);

		break;

	default:

		dev_err(reader->dev, "subframe format not supported");

		return -EINVAL;

	}



	/* Configure data memory format */

	switch (runtime->format) {

	case SNDRV_PCM_FORMAT_S16_LE:

		/* One data word contains two samples */

		SET_UNIPERIF_CONFIG_MEM_FMT_16_16(reader);

		break;



	case SNDRV_PCM_FORMAT_S32_LE:

		/*

		 * Actually "16 bits/0 bits" means "32/28/24/20/18/16 bits

		 * on the MSB then zeros (if less than 32 bytes)"...

		 */

		SET_UNIPERIF_CONFIG_MEM_FMT_16_0(reader);

		break;



	default:

		dev_err(reader->dev, "format not supported");

		return -EINVAL;

	}



	switch (reader->daifmt & SND_SOC_DAIFMT_FORMAT_MASK) {

	case SND_SOC_DAIFMT_I2S:

		SET_UNIPERIF_I2S_FMT_ALIGN_LEFT(reader);

		SET_UNIPERIF_I2S_FMT_PADDING_I2S_MODE(reader);

		break;

	case SND_SOC_DAIFMT_LEFT_J:

		SET_UNIPERIF_I2S_FMT_ALIGN_LEFT(reader);

		SET_UNIPERIF_I2S_FMT_PADDING_SONY_MODE(reader);

		break;

	case SND_SOC_DAIFMT_RIGHT_J:

		SET_UNIPERIF_I2S_FMT_ALIGN_RIGHT(reader);

		SET_UNIPERIF_I2S_FMT_PADDING_SONY_MODE(reader);

		break;

	default:

		dev_err(reader->dev, "format not supported");

		return -EINVAL;

	}



	SET_UNIPERIF_I2S_FMT_ORDER_MSB(reader);



	/* Data clocking (changing) on the rising edge */

	SET_UNIPERIF_I2S_FMT_SCLK_EDGE_RISING(reader);



	/* Number of channels must be even */



	if ((runtime->channels % 2) || (runtime->channels < 2) ||

	    (runtime->channels > 10)) {

		dev_err(reader->dev, "%s: invalid nb of channels", __func__);

		return -EINVAL;

	}



	SET_UNIPERIF_I2S_FMT_NUM_CH(reader, runtime->channels / 2);



	/* Clear any pending interrupts */

	SET_UNIPERIF_ITS_BCLR(reader, GET_UNIPERIF_ITS(reader));



	SET_UNIPERIF_I2S_FMT_NO_OF_SAMPLES_TO_READ(reader, 0);



	/* Set the interrupt mask */

	SET_UNIPERIF_ITM_BSET_DMA_ERROR(reader);

	SET_UNIPERIF_ITM_BSET_FIFO_ERROR(reader);

	SET_UNIPERIF_ITM_BSET_MEM_BLK_READ(reader);



	/* Enable underflow recovery interrupts */

	if (reader->info->underflow_enabled) {

		SET_UNIPERIF_ITM_BSET_UNDERFLOW_REC_DONE(reader);

		SET_UNIPERIF_ITM_BSET_UNDERFLOW_REC_FAILED(reader);

	}



	/* Reset uniperipheral reader */

	SET_UNIPERIF_SOFT_RST_SOFT_RST(reader);



	while (GET_UNIPERIF_SOFT_RST_SOFT_RST(reader)) {

		udelay(5);

		count--;

	}

	if (!count) {

		dev_err(reader->dev, "Failed to reset uniperif");

		return -EIO;

	}



	return 0;

}



static int uni_reader_start(struct uniperif *reader)

{

	/* The reader should be stopped */

	if (reader->state != UNIPERIF_STATE_STOPPED) {

		dev_err(reader->dev, "%s: invalid reader state", __func__);

		return -EINVAL;

	}



	/* Enable reader interrupts (and clear possible stalled ones) */

	SET_UNIPERIF_ITS_BCLR_FIFO_ERROR(reader);

	SET_UNIPERIF_ITM_BSET_FIFO_ERROR(reader);



	/* Launch the reader */

	SET_UNIPERIF_CTRL_OPERATION_PCM_DATA(reader);



	/* Update state to started */

	reader->state = UNIPERIF_STATE_STARTED;

	return 0;

}



static int uni_reader_stop(struct uniperif *reader)

{

	/* The reader should not be in stopped state */

	if (reader->state == UNIPERIF_STATE_STOPPED) {

		dev_err(reader->dev, "%s: invalid reader state", __func__);

		return -EINVAL;

	}



	/* Turn the reader off */

	SET_UNIPERIF_CTRL_OPERATION_OFF(reader);



	/* Disable interrupts */

	SET_UNIPERIF_ITM_BCLR(reader, GET_UNIPERIF_ITM(reader));



	/* Update state to stopped and return */

	reader->state = UNIPERIF_STATE_STOPPED;



	return 0;

}



static int  uni_reader_trigger(struct snd_pcm_substream *substream,

			       int cmd, struct snd_soc_dai *dai)

{

	struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai);

	struct uniperif *reader = priv->dai_data.uni;



	switch (cmd) {

	case SNDRV_PCM_TRIGGER_START:

		return  uni_reader_start(reader);

	case SNDRV_PCM_TRIGGER_STOP:

		return  uni_reader_stop(reader);

	default:

		return -EINVAL;

	}

}



static void uni_reader_shutdown(struct snd_pcm_substream *substream,

				struct snd_soc_dai *dai)

{

	struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai);

	struct uniperif *reader = priv->dai_data.uni;



	if (reader->state != UNIPERIF_STATE_STOPPED) {

		/* Stop the reader */

		uni_reader_stop(reader);

	}

}



static int uni_reader_parse_dt(struct platform_device *pdev,

			       struct uniperif *reader)

{

	struct uniperif_info *info;

	struct device_node *node = pdev->dev.of_node;



	/* Allocate memory for the info structure */

	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);

	if (!info)

		return -ENOMEM;



	of_property_read_u32(node, "version", &reader->ver);



	/* Save the info structure */

	reader->info = info;



	return 0;

}



const struct snd_soc_dai_ops uni_reader_dai_ops = {

		.shutdown = uni_reader_shutdown,

		.prepare = uni_reader_prepare,

		.trigger = uni_reader_trigger,

		.hw_params = sti_uniperiph_dai_hw_params,

		.set_fmt = sti_uniperiph_dai_set_fmt,

};



int uni_reader_init(struct platform_device *pdev,

		    struct uniperif *reader)

{

	int ret = 0;



	reader->dev = &pdev->dev;

	reader->state = UNIPERIF_STATE_STOPPED;

	reader->hw = &uni_reader_pcm_hw;

	reader->dai_ops = &uni_reader_dai_ops;



	dev_err(reader->dev, "%s: enter\n", __func__);

	ret = uni_reader_parse_dt(pdev, reader);

	if (ret < 0) {

		dev_err(reader->dev, "Failed to parse DeviceTree");

		return ret;

	}



	ret = devm_request_irq(&pdev->dev, reader->irq,

			       uni_reader_irq_handler, IRQF_SHARED,

			       dev_name(&pdev->dev), reader);

	if (ret < 0) {

		dev_err(&pdev->dev, "Failed to request IRQ");

		return -EBUSY;

	}



	return 0;

}

EXPORT_SYMBOL_GPL(uni_reader_init);