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182 lines
4.5 KiB
182 lines
4.5 KiB
// SPDX-License-Identifier: GPL-2.0 |
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// |
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// Xilinx ASoC I2S audio support |
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// |
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// Copyright (C) 2018 Xilinx, Inc. |
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// |
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// Author: Praveen Vuppala <[email protected]> |
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// Author: Maruthi Srinivas Bayyavarapu <[email protected]> |
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#include <linux/io.h> |
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#include <linux/module.h> |
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#include <linux/of.h> |
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#include <linux/of_platform.h> |
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#include <linux/platform_device.h> |
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#include <sound/pcm_params.h> |
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#include <sound/soc.h> |
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#define DRV_NAME "xlnx_i2s" |
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#define I2S_CORE_CTRL_OFFSET 0x08 |
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#define I2S_I2STIM_OFFSET 0x20 |
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#define I2S_CH0_OFFSET 0x30 |
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#define I2S_I2STIM_VALID_MASK GENMASK(7, 0) |
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static int xlnx_i2s_set_sclkout_div(struct snd_soc_dai *cpu_dai, |
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int div_id, int div) |
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{ |
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void __iomem *base = snd_soc_dai_get_drvdata(cpu_dai); |
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if (!div || (div & ~I2S_I2STIM_VALID_MASK)) |
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return -EINVAL; |
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writel(div, base + I2S_I2STIM_OFFSET); |
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return 0; |
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} |
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static int xlnx_i2s_hw_params(struct snd_pcm_substream *substream, |
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struct snd_pcm_hw_params *params, |
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struct snd_soc_dai *i2s_dai) |
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{ |
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u32 reg_off, chan_id; |
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void __iomem *base = snd_soc_dai_get_drvdata(i2s_dai); |
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chan_id = params_channels(params) / 2; |
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while (chan_id > 0) { |
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reg_off = I2S_CH0_OFFSET + ((chan_id - 1) * 4); |
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writel(chan_id, base + reg_off); |
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chan_id--; |
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} |
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return 0; |
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} |
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static int xlnx_i2s_trigger(struct snd_pcm_substream *substream, int cmd, |
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struct snd_soc_dai *i2s_dai) |
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{ |
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void __iomem *base = snd_soc_dai_get_drvdata(i2s_dai); |
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switch (cmd) { |
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case SNDRV_PCM_TRIGGER_START: |
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case SNDRV_PCM_TRIGGER_RESUME: |
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case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: |
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writel(1, base + I2S_CORE_CTRL_OFFSET); |
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break; |
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case SNDRV_PCM_TRIGGER_STOP: |
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case SNDRV_PCM_TRIGGER_SUSPEND: |
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case SNDRV_PCM_TRIGGER_PAUSE_PUSH: |
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writel(0, base + I2S_CORE_CTRL_OFFSET); |
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break; |
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default: |
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return -EINVAL; |
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} |
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return 0; |
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} |
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static const struct snd_soc_dai_ops xlnx_i2s_dai_ops = { |
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.trigger = xlnx_i2s_trigger, |
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.set_clkdiv = xlnx_i2s_set_sclkout_div, |
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.hw_params = xlnx_i2s_hw_params |
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}; |
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static const struct snd_soc_component_driver xlnx_i2s_component = { |
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.name = DRV_NAME, |
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}; |
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static const struct of_device_id xlnx_i2s_of_match[] = { |
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{ .compatible = "xlnx,i2s-transmitter-1.0", }, |
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{ .compatible = "xlnx,i2s-receiver-1.0", }, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, xlnx_i2s_of_match); |
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static int xlnx_i2s_probe(struct platform_device *pdev) |
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{ |
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void __iomem *base; |
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struct snd_soc_dai_driver *dai_drv; |
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int ret; |
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u32 ch, format, data_width; |
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struct device *dev = &pdev->dev; |
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struct device_node *node = dev->of_node; |
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dai_drv = devm_kzalloc(&pdev->dev, sizeof(*dai_drv), GFP_KERNEL); |
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if (!dai_drv) |
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return -ENOMEM; |
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base = devm_platform_ioremap_resource(pdev, 0); |
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if (IS_ERR(base)) |
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return PTR_ERR(base); |
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ret = of_property_read_u32(node, "xlnx,num-channels", &ch); |
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if (ret < 0) { |
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dev_err(dev, "cannot get supported channels\n"); |
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return ret; |
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} |
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ch = ch * 2; |
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ret = of_property_read_u32(node, "xlnx,dwidth", &data_width); |
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if (ret < 0) { |
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dev_err(dev, "cannot get data width\n"); |
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return ret; |
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} |
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switch (data_width) { |
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case 16: |
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format = SNDRV_PCM_FMTBIT_S16_LE; |
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break; |
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case 24: |
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format = SNDRV_PCM_FMTBIT_S24_LE; |
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break; |
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default: |
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return -EINVAL; |
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} |
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if (of_device_is_compatible(node, "xlnx,i2s-transmitter-1.0")) { |
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dai_drv->name = "xlnx_i2s_playback"; |
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dai_drv->playback.stream_name = "Playback"; |
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dai_drv->playback.formats = format; |
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dai_drv->playback.channels_min = ch; |
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dai_drv->playback.channels_max = ch; |
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dai_drv->playback.rates = SNDRV_PCM_RATE_8000_192000; |
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dai_drv->ops = &xlnx_i2s_dai_ops; |
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} else if (of_device_is_compatible(node, "xlnx,i2s-receiver-1.0")) { |
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dai_drv->name = "xlnx_i2s_capture"; |
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dai_drv->capture.stream_name = "Capture"; |
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dai_drv->capture.formats = format; |
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dai_drv->capture.channels_min = ch; |
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dai_drv->capture.channels_max = ch; |
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dai_drv->capture.rates = SNDRV_PCM_RATE_8000_192000; |
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dai_drv->ops = &xlnx_i2s_dai_ops; |
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} else { |
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return -ENODEV; |
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} |
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dev_set_drvdata(&pdev->dev, base); |
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ret = devm_snd_soc_register_component(&pdev->dev, &xlnx_i2s_component, |
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dai_drv, 1); |
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if (ret) { |
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dev_err(&pdev->dev, "i2s component registration failed\n"); |
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return ret; |
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} |
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dev_info(&pdev->dev, "%s DAI registered\n", dai_drv->name); |
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return ret; |
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} |
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static struct platform_driver xlnx_i2s_aud_driver = { |
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.driver = { |
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.name = DRV_NAME, |
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.of_match_table = xlnx_i2s_of_match, |
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}, |
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.probe = xlnx_i2s_probe, |
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}; |
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module_platform_driver(xlnx_i2s_aud_driver); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_AUTHOR("Praveen Vuppala <[email protected]>"); |
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MODULE_AUTHOR("Maruthi Srinivas Bayyavarapu <[email protected]>");
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