sound/soc/spear/spdif_in.c - arm/linux-arm64-legacy - Git at Google

 /*
  * 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/dmaengine_pcm.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"
 #include "spear_pcm.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;
 	struct snd_dmaengine_dai_dma_data dma_params_rx;
 	struct snd_dmaengine_pcm_config config;
 };

 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_dai_probe(struct snd_soc_dai *dai)
 {
 	struct spdif_in_dev *host = snd_soc_dai_get_drvdata(dai);

 	host->dma_params_rx.filter_data = &host->dma_params;
 	dai->capture_dma_data = &host->dma_params_rx;

 	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);
 }

 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 = {
 	.shutdown	= spdif_in_shutdown,
 	.trigger	= spdif_in_trigger,
 	.hw_params	= spdif_in_hw_params,
 };

 static struct snd_soc_dai_driver spdif_in_dai = {
 	.probe = spdif_in_dai_probe,
 	.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 const struct snd_soc_component_driver spdif_in_component = {
 	.name		= "spdif-in",
 };

 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 = devm_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->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) {
 		dev_warn(&pdev->dev, "request_irq failed\n");
 		return ret;
 	}

 	ret = devm_snd_soc_register_component(&pdev->dev, &spdif_in_component,
 					      &spdif_in_dai, 1);
 	if (ret)
 		return ret;

 	return devm_spear_pcm_platform_register(&pdev->dev, &host->config,
 						pdata->filter);
 }

 static struct platform_driver spdif_in_driver = {
 	.probe		= spdif_in_probe,
 	.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");
	/*
	* 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/dmaengine_pcm.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"
	#include "spear_pcm.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;
	struct snd_dmaengine_dai_dma_data dma_params_rx;
	struct snd_dmaengine_pcm_config config;
	};

	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_dai_probe(struct snd_soc_dai *dai)
	{
	struct spdif_in_dev *host = snd_soc_dai_get_drvdata(dai);

	host->dma_params_rx.filter_data = &host->dma_params;
	dai->capture_dma_data = &host->dma_params_rx;

	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);
	}

	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 = {
	.shutdown = spdif_in_shutdown,
	.trigger = spdif_in_trigger,
	.hw_params = spdif_in_hw_params,
	};

	static struct snd_soc_dai_driver spdif_in_dai = {
	.probe = spdif_in_dai_probe,
	.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 const struct snd_soc_component_driver spdif_in_component = {
	.name = "spdif-in",
	};

	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 = devm_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->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) {
	dev_warn(&pdev->dev, "request_irq failed\n");
	return ret;
	}

	ret = devm_snd_soc_register_component(&pdev->dev, &spdif_in_component,
	&spdif_in_dai, 1);
	if (ret)
	return ret;

	return devm_spear_pcm_platform_register(&pdev->dev, &host->config,
	pdata->filter);
	}

	static struct platform_driver spdif_in_driver = {
	.probe = spdif_in_probe,
	.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");