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Commit ace36d85 authored by Vipin Kumar's avatar Vipin Kumar Committed by Mark Brown
Browse files

ASoC: SPEAr spdif_in: Add spdif IN support 



This patch implements the spdif IN driver for ST peripheral

Signed-off-by: default avatarVipin Kumar <vipin.kumar@st.com>
Signed-off-by: default avatarRajeev Kumar <rajeev-dlh.kumar@st.com>
Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent 241b446f

include/sound/spear_spdif.h

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/*

 * Copyright (ST) 2012 Vipin Kumar (vipin.kumar@st.com)

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

 */



#ifndef __SOUND_SPDIF_H

#define __SOUND_SPDIF_H



struct spear_spdif_platform_data {

	/* DMA params */

	void *dma_params;

	bool (*filter)(struct dma_chan *chan, void *slave);

	void (*reset_perip)(void);

};



#endif /* SOUND_SPDIF_H */

sound/soc/spear/spdif_in.c

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/*

 * ALSA SoC SPDIF In Audio Layer for spear processors

 *

 * Copyright (C) 2012 ST Microelectronics

 * Vipin Kumar <vipin.kumar@st.com>

 *

 * This file is licensed under the terms of the GNU General Public

 * License version 2. This program is licensed "as is" without any

 * warranty of any kind, whether express or implied.

 */



#include <linux/clk.h>

#include <linux/delay.h>

#include <linux/device.h>

#include <linux/kernel.h>

#include <linux/init.h>

#include <linux/io.h>

#include <linux/ioport.h>

#include <linux/module.h>

#include <linux/platform_device.h>

#include <sound/pcm.h>

#include <sound/pcm_params.h>

#include <sound/soc.h>

#include <sound/spear_dma.h>

#include <sound/spear_spdif.h>

#include "spdif_in_regs.h"



struct spdif_in_params {

	u32 format;

};



struct spdif_in_dev {

	struct clk *clk;

	struct spear_dma_data dma_params;

	struct spdif_in_params saved_params;

	void *io_base;

	struct device *dev;

	void (*reset_perip)(void);

	int irq;

};



static void spdif_in_configure(struct spdif_in_dev *host)

{

	u32 ctrl = SPDIF_IN_PRTYEN | SPDIF_IN_STATEN | SPDIF_IN_USREN |

		SPDIF_IN_VALEN | SPDIF_IN_BLKEN;

	ctrl |= SPDIF_MODE_16BIT | SPDIF_FIFO_THRES_16;



	writel(ctrl, host->io_base + SPDIF_IN_CTRL);

	writel(0xF, host->io_base + SPDIF_IN_IRQ_MASK);

}



static int spdif_in_startup(struct snd_pcm_substream *substream,

		struct snd_soc_dai *cpu_dai)

{

	struct spdif_in_dev *host = snd_soc_dai_get_drvdata(cpu_dai);



	if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)

		return -EINVAL;



	snd_soc_dai_set_dma_data(cpu_dai, substream, (void *)&host->dma_params);

	return 0;

}



static void spdif_in_shutdown(struct snd_pcm_substream *substream,

		struct snd_soc_dai *dai)

{

	struct spdif_in_dev *host = snd_soc_dai_get_drvdata(dai);



	if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)

		return;



	writel(0x0, host->io_base + SPDIF_IN_IRQ_MASK);

	snd_soc_dai_set_dma_data(dai, substream, NULL);

}



static void spdif_in_format(struct spdif_in_dev *host, u32 format)

{

	u32 ctrl = readl(host->io_base + SPDIF_IN_CTRL);



	switch (format) {

	case SNDRV_PCM_FORMAT_S16_LE:

		ctrl |= SPDIF_XTRACT_16BIT;

		break;



	case SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE:

		ctrl &= ~SPDIF_XTRACT_16BIT;

		break;

	}



	writel(ctrl, host->io_base + SPDIF_IN_CTRL);

}



static int spdif_in_hw_params(struct snd_pcm_substream *substream,

		struct snd_pcm_hw_params *params,

		struct snd_soc_dai *dai)

{

	struct spdif_in_dev *host = snd_soc_dai_get_drvdata(dai);

	u32 format;



	if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)

		return -EINVAL;



	format = params_format(params);

	host->saved_params.format = format;



	return 0;

}



static int spdif_in_trigger(struct snd_pcm_substream *substream, int cmd,

		struct snd_soc_dai *dai)

{

	struct spdif_in_dev *host = snd_soc_dai_get_drvdata(dai);

	u32 ctrl;

	int ret = 0;



	if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)

		return -EINVAL;



	switch (cmd) {

	case SNDRV_PCM_TRIGGER_START:

	case SNDRV_PCM_TRIGGER_RESUME:

	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:

		clk_enable(host->clk);

		spdif_in_configure(host);

		spdif_in_format(host, host->saved_params.format);



		ctrl = readl(host->io_base + SPDIF_IN_CTRL);

		ctrl |= SPDIF_IN_SAMPLE | SPDIF_IN_ENB;

		writel(ctrl, host->io_base + SPDIF_IN_CTRL);

		writel(0xF, host->io_base + SPDIF_IN_IRQ_MASK);

		break;



	case SNDRV_PCM_TRIGGER_STOP:

	case SNDRV_PCM_TRIGGER_SUSPEND:

	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:

		ctrl = readl(host->io_base + SPDIF_IN_CTRL);

		ctrl &= ~(SPDIF_IN_SAMPLE | SPDIF_IN_ENB);

		writel(ctrl, host->io_base + SPDIF_IN_CTRL);

		writel(0x0, host->io_base + SPDIF_IN_IRQ_MASK);



		if (host->reset_perip)

			host->reset_perip();

		clk_disable(host->clk);

		break;



	default:

		ret = -EINVAL;

		break;

	}

	return ret;

}



static struct snd_soc_dai_ops spdif_in_dai_ops = {

	.startup	= spdif_in_startup,

	.shutdown	= spdif_in_shutdown,

	.trigger	= spdif_in_trigger,

	.hw_params	= spdif_in_hw_params,

};



struct snd_soc_dai_driver spdif_in_dai = {

	.capture = {

		.channels_min = 2,

		.channels_max = 2,

		.rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \

				 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000 | \

				 SNDRV_PCM_RATE_192000),

		.formats = SNDRV_PCM_FMTBIT_S16_LE | \

			   SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE,

	},

	.ops = &spdif_in_dai_ops,

};



static irqreturn_t spdif_in_irq(int irq, void *arg)

{

	struct spdif_in_dev *host = (struct spdif_in_dev *)arg;



	u32 irq_status = readl(host->io_base + SPDIF_IN_IRQ);



	if (!irq_status)

		return IRQ_NONE;



	if (irq_status & SPDIF_IRQ_FIFOWRITE)

		dev_err(host->dev, "spdif in: fifo write error");

	if (irq_status & SPDIF_IRQ_EMPTYFIFOREAD)

		dev_err(host->dev, "spdif in: empty fifo read error");

	if (irq_status & SPDIF_IRQ_FIFOFULL)

		dev_err(host->dev, "spdif in: fifo full error");

	if (irq_status & SPDIF_IRQ_OUTOFRANGE)

		dev_err(host->dev, "spdif in: out of range error");



	writel(0, host->io_base + SPDIF_IN_IRQ);



	return IRQ_HANDLED;

}



static int spdif_in_probe(struct platform_device *pdev)

{

	struct spdif_in_dev *host;

	struct spear_spdif_platform_data *pdata;

	struct resource *res, *res_fifo;

	int ret;



	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	if (!res)

		return -EINVAL;



	res_fifo = platform_get_resource(pdev, IORESOURCE_IO, 0);

	if (!res_fifo)

		return -EINVAL;



	if (!devm_request_mem_region(&pdev->dev, res->start,

				resource_size(res), pdev->name)) {

		dev_warn(&pdev->dev, "Failed to get memory resourse\n");

		return -ENOENT;

	}



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

	if (!host) {

		dev_warn(&pdev->dev, "kzalloc fail\n");

		return -ENOMEM;

	}



	host->io_base = devm_ioremap(&pdev->dev, res->start,

				resource_size(res));

	if (!host->io_base) {

		dev_warn(&pdev->dev, "ioremap failed\n");

		return -ENOMEM;

	}



	host->irq = platform_get_irq(pdev, 0);

	if (host->irq < 0)

		return -EINVAL;



	host->clk = clk_get(&pdev->dev, NULL);

	if (IS_ERR(host->clk))

		return PTR_ERR(host->clk);



	pdata = dev_get_platdata(&pdev->dev);



	if (!pdata)

		return -EINVAL;



	host->dma_params.data = pdata->dma_params;

	host->dma_params.addr = res_fifo->start;

	host->dma_params.max_burst = 16;

	host->dma_params.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;

	host->dma_params.filter = pdata->filter;

	host->reset_perip = pdata->reset_perip;



	host->dev = &pdev->dev;

	dev_set_drvdata(&pdev->dev, host);



	ret = devm_request_irq(&pdev->dev, host->irq, spdif_in_irq, 0,

			"spdif-in", host);

	if (ret) {

		clk_put(host->clk);

		dev_warn(&pdev->dev, "request_irq failed\n");

		return ret;

	}



	ret = snd_soc_register_dai(&pdev->dev, &spdif_in_dai);

	if (ret != 0) {

		clk_put(host->clk);

		return ret;

	}



	return 0;

}



static int spdif_in_remove(struct platform_device *pdev)

{

	struct spdif_in_dev *host = dev_get_drvdata(&pdev->dev);



	snd_soc_unregister_dai(&pdev->dev);

	dev_set_drvdata(&pdev->dev, NULL);



	clk_put(host->clk);



	return 0;

}





static struct platform_driver spdif_in_driver = {

	.probe		= spdif_in_probe,

	.remove		= spdif_in_remove,

	.driver		= {

		.name	= "spdif-in",

		.owner	= THIS_MODULE,

	},

};



module_platform_driver(spdif_in_driver);



MODULE_AUTHOR("Vipin Kumar <vipin.kumar@st.com>");

MODULE_DESCRIPTION("SPEAr SPDIF IN SoC Interface");

MODULE_LICENSE("GPL");

MODULE_ALIAS("platform:spdif_in");

sound/soc/spear/spdif_in_regs.h

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/*

 * SPEAr SPDIF IN controller header file

 *

 * Copyright (ST) 2011 Vipin Kumar (vipin.kumar@st.com)

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

 */



#ifndef SPDIF_IN_REGS_H

#define SPDIF_IN_REGS_H



#define SPDIF_IN_CTRL		0x00

	#define SPDIF_IN_PRTYEN		(1 << 20)

	#define SPDIF_IN_STATEN		(1 << 19)

	#define SPDIF_IN_USREN		(1 << 18)

	#define SPDIF_IN_VALEN		(1 << 17)

	#define SPDIF_IN_BLKEN		(1 << 16)



	#define SPDIF_MODE_24BIT	(8 << 12)

	#define SPDIF_MODE_23BIT	(7 << 12)

	#define SPDIF_MODE_22BIT	(6 << 12)

	#define SPDIF_MODE_21BIT	(5 << 12)

	#define SPDIF_MODE_20BIT	(4 << 12)

	#define SPDIF_MODE_19BIT	(3 << 12)

	#define SPDIF_MODE_18BIT	(2 << 12)

	#define SPDIF_MODE_17BIT	(1 << 12)

	#define SPDIF_MODE_16BIT	(0 << 12)

	#define SPDIF_MODE_MASK		(0x0F << 12)



	#define SPDIF_IN_VALID		(1 << 11)

	#define SPDIF_IN_SAMPLE		(1 << 10)

	#define SPDIF_DATA_SWAP		(1 << 9)

	#define SPDIF_IN_ENB		(1 << 8)

	#define SPDIF_DATA_REVERT	(1 << 7)

	#define SPDIF_XTRACT_16BIT	(1 << 6)

	#define SPDIF_FIFO_THRES_16	(16 << 0)



#define SPDIF_IN_IRQ_MASK	0x04

#define SPDIF_IN_IRQ		0x08

	#define SPDIF_IRQ_FIFOWRITE	(1 << 0)

	#define SPDIF_IRQ_EMPTYFIFOREAD	(1 << 1)

	#define SPDIF_IRQ_FIFOFULL	(1 << 2)

	#define SPDIF_IRQ_OUTOFRANGE	(1 << 3)



#define SPDIF_IN_STA		0x0C

	#define SPDIF_IN_LOCK		(0x1 << 0)



#endif /* SPDIF_IN_REGS_H */