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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)
- {
- 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;
- base = devm_platform_ioremap_resource(pdev, 0);
- 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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