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// 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>");
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