#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_CORE_CTRL_32BIT_LRCLK BIT(3)
#define I2S_CORE_CTRL_ENABLE BIT(0)
#define I2S_I2STIM_OFFSET 0x20
#define I2S_CH0_OFFSET 0x30
#define I2S_I2STIM_VALID_MASK GENMASK(7, 0)
struct xlnx_i2s_drv_data {
struct snd_soc_dai_driver dai_drv;
void __iomem *base;
unsigned int sysclk;
u32 data_width;
u32 channels;
bool is_32bit_lrclk;
struct snd_ratnum ratnum;
struct snd_pcm_hw_constraint_ratnums rate_constraints;
};
static int xlnx_i2s_set_sclkout_div(struct snd_soc_dai *cpu_dai,
int div_id, int div)
{
struct xlnx_i2s_drv_data *drv_data = snd_soc_dai_get_drvdata(cpu_dai);
if (!div || (div & ~I2S_I2STIM_VALID_MASK))
return -EINVAL;
drv_data->sysclk = 0;
writel(div, drv_data->base + I2S_I2STIM_OFFSET);
return 0;
}
static int xlnx_i2s_set_sysclk(struct snd_soc_dai *dai,
int clk_id, unsigned int freq, int dir)
{
struct xlnx_i2s_drv_data *drv_data = snd_soc_dai_get_drvdata(dai);
drv_data->sysclk = freq;
if (freq) {
unsigned int bits_per_sample;
if (drv_data->is_32bit_lrclk)
bits_per_sample = 32;
else
bits_per_sample = drv_data->data_width;
drv_data->ratnum.num = freq / (bits_per_sample * drv_data->channels) / 2;
drv_data->ratnum.den_step = 1;
drv_data->ratnum.den_min = 1;
drv_data->ratnum.den_max = 255;
drv_data->rate_constraints.rats = &drv_data->ratnum;
drv_data->rate_constraints.nrats = 1;
}
return 0;
}
static int xlnx_i2s_startup(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct xlnx_i2s_drv_data *drv_data = snd_soc_dai_get_drvdata(dai);
if (drv_data->sysclk)
return snd_pcm_hw_constraint_ratnums(substream->runtime, 0,
SNDRV_PCM_HW_PARAM_RATE,
&drv_data->rate_constraints);
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;
struct xlnx_i2s_drv_data *drv_data = snd_soc_dai_get_drvdata(i2s_dai);
if (drv_data->sysclk) {
unsigned int bits_per_sample, sclk, sclk_div;
if (drv_data->is_32bit_lrclk)
bits_per_sample = 32;
else
bits_per_sample = drv_data->data_width;
sclk = params_rate(params) * bits_per_sample * params_channels(params);
sclk_div = drv_data->sysclk / sclk / 2;
if ((drv_data->sysclk % sclk != 0) ||
!sclk_div || (sclk_div & ~I2S_I2STIM_VALID_MASK)) {
dev_warn(i2s_dai->dev, "invalid SCLK divisor for sysclk %u and sclk %u\n",
drv_data->sysclk, sclk);
return -EINVAL;
}
writel(sclk_div, drv_data->base + I2S_I2STIM_OFFSET);
}
chan_id = params_channels(params) / 2;
while (chan_id > 0) {
reg_off = I2S_CH0_OFFSET + ((chan_id - 1) * 4);
writel(chan_id, drv_data->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)
{
struct xlnx_i2s_drv_data *drv_data = 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(I2S_CORE_CTRL_ENABLE, drv_data->base + I2S_CORE_CTRL_OFFSET);
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
writel(0, drv_data->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_sysclk = xlnx_i2s_set_sysclk,
.set_clkdiv = xlnx_i2s_set_sclkout_div,
.startup = xlnx_i2s_startup,
.hw_params = xlnx_i2s_hw_params
};
static const struct snd_soc_component_driver xlnx_i2s_component = {
.name = DRV_NAME,
.legacy_dai_naming = 1,
};
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 xlnx_i2s_drv_data *drv_data;
int ret;
u32 format;
struct device *dev = &pdev->dev;
struct device_node *node = dev->of_node;
drv_data = devm_kzalloc(&pdev->dev, sizeof(*drv_data), GFP_KERNEL);
if (!drv_data)
return -ENOMEM;
drv_data->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(drv_data->base))
return PTR_ERR(drv_data->base);
ret = of_property_read_u32(node, "xlnx,num-channels", &drv_data->channels);
if (ret < 0) {
dev_err(dev, "cannot get supported channels\n");
return ret;
}
drv_data->channels *= 2;
ret = of_property_read_u32(node, "xlnx,dwidth", &drv_data->data_width);
if (ret < 0) {
dev_err(dev, "cannot get data width\n");
return ret;
}
switch (drv_data->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")) {
drv_data->dai_drv.name = "xlnx_i2s_playback";
drv_data->dai_drv.playback.stream_name = "Playback";
drv_data->dai_drv.playback.formats = format;
drv_data->dai_drv.playback.channels_min = drv_data->channels;
drv_data->dai_drv.playback.channels_max = drv_data->channels;
drv_data->dai_drv.playback.rates = SNDRV_PCM_RATE_8000_192000;
drv_data->dai_drv.ops = &xlnx_i2s_dai_ops;
} else if (of_device_is_compatible(node, "xlnx,i2s-receiver-1.0")) {
drv_data->dai_drv.name = "xlnx_i2s_capture";
drv_data->dai_drv.capture.stream_name = "Capture";
drv_data->dai_drv.capture.formats = format;
drv_data->dai_drv.capture.channels_min = drv_data->channels;
drv_data->dai_drv.capture.channels_max = drv_data->channels;
drv_data->dai_drv.capture.rates = SNDRV_PCM_RATE_8000_192000;
drv_data->dai_drv.ops = &xlnx_i2s_dai_ops;
} else {
return -ENODEV;
}
drv_data->is_32bit_lrclk = readl(drv_data->base + I2S_CORE_CTRL_OFFSET) &
I2S_CORE_CTRL_32BIT_LRCLK;
dev_set_drvdata(&pdev->dev, drv_data);
ret = devm_snd_soc_register_component(&pdev->dev, &xlnx_i2s_component,
&drv_data->dai_drv, 1);
if (ret) {
dev_err(&pdev->dev, "i2s component registration failed\n");
return ret;
}
dev_info(&pdev->dev, "%s DAI registered\n", drv_data->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_DESCRIPTION("ASoC driver for Xilinx I2S audio");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Praveen Vuppala <praveenv@xilinx.com>");
MODULE_AUTHOR("Maruthi Srinivas Bayyavarapu <maruthis@xilinx.com>");
