Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Unverified Commit 112a8900 authored by Maruthi Srinivas Bayyavarapu's avatar Maruthi Srinivas Bayyavarapu Committed by Mark Brown
Browse files

ASoC: xlnx: Add i2s driver 



I2S IP instance can work in transmitter/playback or receiver/capture mode
exclusively. The patch registers corresponding instance as ASoC component
with audio framework.

Signed-off-by: default avatarMaruthi Srinivas Bayyavarapu <maruthi.srinivas.bayyavarapu@xilinx.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 644c2dcf

sound/soc/xilinx/xlnx_i2s.c

0 → 100644
+185 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

/*

 * Xilinx ASoC I2S audio support

 *

 * Copyright (C) 2018 Xilinx, Inc.

 *

 * Author: Praveen Vuppala <praveenv@xilinx.com>

 * Author: Maruthi Srinivas Bayyavarapu <maruthis@xilinx.com>

 */



#include <linux/io.h>

#include <linux/module.h>

#include <linux/of.h>

#include <linux/of_platform.h>

#include <linux/platform_device.h>

#include <sound/pcm_params.h>

#include <sound/soc.h>



#define DRV_NAME "xlnx_i2s"



#define I2S_CORE_CTRL_OFFSET		0x08

#define I2S_I2STIM_OFFSET		0x20

#define I2S_CH0_OFFSET			0x30

#define I2S_I2STIM_VALID_MASK		GENMASK(7, 0)



static int xlnx_i2s_set_sclkout_div(struct snd_soc_dai *cpu_dai,

				    int div_id, int div)

{

	void __iomem *base = snd_soc_dai_get_drvdata(cpu_dai);



	if (!div || (div & ~I2S_I2STIM_VALID_MASK))

		return -EINVAL;



	writel(div, base + I2S_I2STIM_OFFSET);



	return 0;

}



static int xlnx_i2s_hw_params(struct snd_pcm_substream *substream,

			      struct snd_pcm_hw_params *params,

			      struct snd_soc_dai *i2s_dai)

{

	u32 reg_off, chan_id;

	void __iomem *base = snd_soc_dai_get_drvdata(i2s_dai);



	chan_id = params_channels(params) / 2;



	while (chan_id > 0) {

		reg_off = I2S_CH0_OFFSET + ((chan_id - 1) * 4);

		writel(chan_id, base + reg_off);

		chan_id--;

	}



	return 0;

}



static int xlnx_i2s_trigger(struct snd_pcm_substream *substream, int cmd,

			    struct snd_soc_dai *i2s_dai)

{

	void __iomem *base = snd_soc_dai_get_drvdata(i2s_dai);



	switch (cmd) {

	case SNDRV_PCM_TRIGGER_START:

	case SNDRV_PCM_TRIGGER_RESUME:

	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:

		writel(1, base + I2S_CORE_CTRL_OFFSET);

		break;

	case SNDRV_PCM_TRIGGER_STOP:

	case SNDRV_PCM_TRIGGER_SUSPEND:

	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:

		writel(0, base + I2S_CORE_CTRL_OFFSET);

		break;

	default:

		return -EINVAL;

	}



	return 0;

}



static const struct snd_soc_dai_ops xlnx_i2s_dai_ops = {

	.trigger = xlnx_i2s_trigger,

	.set_clkdiv = xlnx_i2s_set_sclkout_div,

	.hw_params = xlnx_i2s_hw_params

};



static const struct snd_soc_component_driver xlnx_i2s_component = {

	.name = DRV_NAME,

};



static const struct of_device_id xlnx_i2s_of_match[] = {

	{ .compatible = "xlnx,i2s-transmitter-1.0", },

	{ .compatible = "xlnx,i2s-receiver-1.0", },

	{},

};

MODULE_DEVICE_TABLE(of, xlnx_i2s_of_match);



static int xlnx_i2s_probe(struct platform_device *pdev)

{

	struct resource *res;

	void __iomem *base;

	struct snd_soc_dai_driver *dai_drv;

	int ret;

	u32 ch, format, data_width;

	struct device *dev = &pdev->dev;

	struct device_node *node = dev->of_node;



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

	if (!dai_drv)

		return -ENOMEM;



	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	base = devm_ioremap_resource(&pdev->dev, res);

	if (IS_ERR(base))

		return PTR_ERR(base);



	ret = of_property_read_u32(node, "xlnx,num-channels", &ch);

	if (ret < 0) {

		dev_err(dev, "cannot get supported channels\n");

		return ret;

	}

	ch = ch * 2;



	ret = of_property_read_u32(node, "xlnx,dwidth", &data_width);

	if (ret < 0) {

		dev_err(dev, "cannot get data width\n");

		return ret;

	}

	switch (data_width) {

	case 16:

		format = SNDRV_PCM_FMTBIT_S16_LE;

		break;

	case 24:

		format = SNDRV_PCM_FMTBIT_S24_LE;

		break;

	default:

		return -EINVAL;

	}



	if (of_device_is_compatible(node, "xlnx,i2s-transmitter-1.0")) {

		dai_drv->name = "xlnx_i2s_playback";

		dai_drv->playback.stream_name = "Playback";

		dai_drv->playback.formats = format;

		dai_drv->playback.channels_min = ch;

		dai_drv->playback.channels_max = ch;

		dai_drv->playback.rates	= SNDRV_PCM_RATE_8000_192000;

		dai_drv->ops = &xlnx_i2s_dai_ops;

	} else if (of_device_is_compatible(node, "xlnx,i2s-receiver-1.0")) {

		dai_drv->name = "xlnx_i2s_capture";

		dai_drv->capture.stream_name = "Capture";

		dai_drv->capture.formats = format;

		dai_drv->capture.channels_min = ch;

		dai_drv->capture.channels_max = ch;

		dai_drv->capture.rates = SNDRV_PCM_RATE_8000_192000;

		dai_drv->ops = &xlnx_i2s_dai_ops;

	} else {

		return -ENODEV;

	}



	dev_set_drvdata(&pdev->dev, base);



	ret = devm_snd_soc_register_component(&pdev->dev, &xlnx_i2s_component,

					      dai_drv, 1);

	if (ret) {

		dev_err(&pdev->dev, "i2s component registration failed\n");

		return ret;

	}



	dev_info(&pdev->dev, "%s DAI registered\n", dai_drv->name);



	return ret;

}



static struct platform_driver xlnx_i2s_aud_driver = {

	.driver = {

		.name = DRV_NAME,

		.of_match_table = xlnx_i2s_of_match,

	},

	.probe = xlnx_i2s_probe,

};



module_platform_driver(xlnx_i2s_aud_driver);



MODULE_LICENSE("GPL v2");

MODULE_AUTHOR("Praveen Vuppala  <praveenv@xilinx.com>");

MODULE_AUTHOR("Maruthi Srinivas Bayyavarapu <maruthis@xilinx.com>");