3 files changed, 244 insertions, 0 deletions

diff --git a/sound/soc/loongson/Kconfig b/sound/soc/loongson/Kconfig
index 4478ac91e402..c175f9de19a8 100644
--- a/sound/soc/loongson/Kconfig
+++ b/sound/soc/loongson/Kconfig
@@ -13,4 +13,14 @@ config SND_SOC_LOONGSON_I2S_PCI
 	  The controller is found in loongson bridge chips or SoCs,
 	  and work as a PCI device.
 
+config SND_SOC_LOONGSON_CARD
+	tristate "Loongson Sound Card Driver"
+	select SND_SOC_LOONGSON_I2S_PCI
+	help
+	  Say Y or M if you want to add support for SoC audio using
+	  loongson I2S controller.
+
+	  The driver add support for ALSA SoC Audio support using
+	  loongson I2S controller.
+
 endmenu
diff --git a/sound/soc/loongson/Makefile b/sound/soc/loongson/Makefile
index 099af7989103..601a905a4860 100644
--- a/sound/soc/loongson/Makefile
+++ b/sound/soc/loongson/Makefile
@@ -2,3 +2,7 @@
 #Platform Support
 snd-soc-loongson-i2s-pci-objs := loongson_i2s_pci.o loongson_i2s.o loongson_dma.o
 obj-$(CONFIG_SND_SOC_LOONGSON_I2S_PCI) += snd-soc-loongson-i2s-pci.o
+
+#Machine Support
+snd-soc-loongson-card-objs := loongson_card.o
+obj-$(CONFIG_SND_SOC_LOONGSON_CARD) += snd-soc-loongson-card.o
diff --git a/sound/soc/loongson/loongson_card.c b/sound/soc/loongson/loongson_card.c
new file mode 100644
index 000000000000..965eaf4e9109
--- /dev/null
+++ b/sound/soc/loongson/loongson_card.c
@@ -0,0 +1,230 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Loongson ASoC Audio Machine driver
+//
+// Copyright (C) 2023 Loongson Technology Corporation Limited
+// Author: Yingkun Meng <mengyingkun@loongson.cn>
+//
+
+#include <linux/module.h>
+#include <sound/soc.h>
+#include <sound/soc-acpi.h>
+#include <linux/acpi.h>
+#include <linux/pci.h>
+#include <sound/pcm_params.h>
+
+static char codec_name[SND_ACPI_I2C_ID_LEN];
+
+struct loongson_card_data {
+	struct snd_soc_card snd_card;
+	unsigned int mclk_fs;
+};
+
+static int loongson_card_hw_params(struct snd_pcm_substream *substream,
+				   struct snd_pcm_hw_params *params)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
+	struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
+	struct loongson_card_data *ls_card = snd_soc_card_get_drvdata(rtd->card);
+	int ret, mclk;
+
+	if (ls_card->mclk_fs) {
+		mclk = ls_card->mclk_fs * params_rate(params);
+		ret = snd_soc_dai_set_sysclk(cpu_dai, 0, mclk,
+					     SND_SOC_CLOCK_OUT);
+		if (ret < 0) {
+			dev_err(codec_dai->dev, "cpu_dai clock not set\n");
+			return ret;
+		}
+
+		ret = snd_soc_dai_set_sysclk(codec_dai, 0, mclk,
+					     SND_SOC_CLOCK_IN);
+		if (ret < 0) {
+			dev_err(codec_dai->dev, "codec_dai clock not set\n");
+			return ret;
+		}
+	}
+	return 0;
+}
+
+static const struct snd_soc_ops loongson_ops = {
+	.hw_params = loongson_card_hw_params,
+};
+
+SND_SOC_DAILINK_DEFS(analog,
+	DAILINK_COMP_ARRAY(COMP_CPU("loongson-i2s")),
+	DAILINK_COMP_ARRAY(COMP_EMPTY()),
+	DAILINK_COMP_ARRAY(COMP_EMPTY()));
+
+static struct snd_soc_dai_link loongson_dai_links[] = {
+	{
+		.name = "Loongson Audio Port",
+		.stream_name = "Loongson Audio",
+		.dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_IB_NF
+			| SND_SOC_DAIFMT_CBC_CFC,
+		SND_SOC_DAILINK_REG(analog),
+		.ops = &loongson_ops,
+	},
+};
+
+static int loongson_card_parse_acpi(struct loongson_card_data *data)
+{
+	struct snd_soc_card *card = &data->snd_card;
+	struct fwnode_handle *fwnode = card->dev->fwnode;
+	struct fwnode_reference_args args;
+	const char *codec_dai_name;
+	struct acpi_device *adev;
+	struct device *phy_dev;
+	int ret, i;
+
+	/* fixup platform name based on reference node */
+	memset(&args, 0, sizeof(args));
+	ret = acpi_node_get_property_reference(fwnode, "cpu", 0, &args);
+	if (ACPI_FAILURE(ret) || !is_acpi_device_node(args.fwnode)) {
+		dev_err(card->dev, "No matching phy in ACPI table\n");
+		return ret;
+	}
+	adev = to_acpi_device_node(args.fwnode);
+	phy_dev = acpi_get_first_physical_node(adev);
+	if (!phy_dev)
+		return -EPROBE_DEFER;
+	for (i = 0; i < card->num_links; i++)
+		loongson_dai_links[i].platforms->name = dev_name(phy_dev);
+
+	/* fixup codec name based on reference node */
+	memset(&args, 0, sizeof(args));
+	ret = acpi_node_get_property_reference(fwnode, "codec", 0, &args);
+	if (ACPI_FAILURE(ret) || !is_acpi_device_node(args.fwnode)) {
+		dev_err(card->dev, "No matching phy in ACPI table\n");
+		return ret;
+	}
+	adev = to_acpi_device_node(args.fwnode);
+	snprintf(codec_name, sizeof(codec_name), "i2c-%s", acpi_dev_name(adev));
+	for (i = 0; i < card->num_links; i++)
+		loongson_dai_links[i].codecs->name = codec_name;
+
+	device_property_read_string(card->dev, "codec-dai-name",
+				    &codec_dai_name);
+	for (i = 0; i < card->num_links; i++)
+		loongson_dai_links[i].codecs->dai_name = codec_dai_name;
+
+	return 0;
+}
+
+static int loongson_card_parse_of(struct loongson_card_data *data)
+{
+	const char *cpu_dai_name, *codec_dai_name;
+	struct device_node *cpu, *codec;
+	struct snd_soc_card *card = &data->snd_card;
+	struct device *dev = card->dev;
+	struct of_phandle_args args;
+	int ret, i;
+
+	cpu = of_get_child_by_name(dev->of_node, "cpu");
+	if (!cpu) {
+		dev_err(dev, "platform property missing or invalid\n");
+		return -EINVAL;
+	}
+	codec = of_get_child_by_name(dev->of_node, "codec");
+	if (!codec) {
+		dev_err(dev, "audio-codec property missing or invalid\n");
+		ret = -EINVAL;
+		goto err;
+	}
+
+	ret = of_parse_phandle_with_args(cpu, "sound-dai",
+					 "#sound-dai-cells", 0, &args);
+	if (ret) {
+		dev_err(dev, "codec node missing #sound-dai-cells\n");
+		goto err;
+	}
+	for (i = 0; i < card->num_links; i++)
+		loongson_dai_links[i].cpus->of_node = args.np;
+
+	ret = of_parse_phandle_with_args(codec, "sound-dai",
+					 "#sound-dai-cells", 0, &args);
+	if (ret) {
+		dev_err(dev, "codec node missing #sound-dai-cells\n");
+		goto err;
+	}
+	for (i = 0; i < card->num_links; i++)
+		loongson_dai_links[i].codecs->of_node = args.np;
+
+	snd_soc_of_get_dai_name(cpu, &cpu_dai_name);
+	snd_soc_of_get_dai_name(codec, &codec_dai_name);
+	for (i = 0; i < card->num_links; i++) {
+		loongson_dai_links[i].cpus->dai_name = cpu_dai_name;
+		loongson_dai_links[i].codecs->dai_name = codec_dai_name;
+	}
+	of_node_put(cpu);
+	of_node_put(codec);
+
+	return 0;
+
+err:
+	of_node_put(cpu);
+	of_node_put(codec);
+	return ret;
+}
+
+static int loongson_asoc_card_probe(struct platform_device *pdev)
+{
+	struct loongson_card_data *ls_priv;
+	struct snd_soc_card *card;
+	int ret;
+
+	ls_priv = devm_kzalloc(&pdev->dev, sizeof(*ls_priv), GFP_KERNEL);
+	if (!ls_priv)
+		return -ENOMEM;
+
+	card = &ls_priv->snd_card;
+
+	card->dev = &pdev->dev;
+	card->owner = THIS_MODULE;
+	card->dai_link = loongson_dai_links;
+	card->num_links = ARRAY_SIZE(loongson_dai_links);
+	snd_soc_card_set_drvdata(card, ls_priv);
+
+	ret = device_property_read_string(&pdev->dev, "model", &card->name);
+	if (ret) {
+		dev_err(&pdev->dev, "Error parsing card name: %d\n", ret);
+		return ret;
+	}
+	ret = device_property_read_u32(&pdev->dev, "mclk-fs", &ls_priv->mclk_fs);
+	if (ret) {
+		dev_err(&pdev->dev, "Error parsing mclk-fs: %d\n", ret);
+		return ret;
+	}
+
+	if (has_acpi_companion(&pdev->dev))
+		ret = loongson_card_parse_acpi(ls_priv);
+	else
+		ret = loongson_card_parse_of(ls_priv);
+	if (ret < 0)
+		return ret;
+
+	ret = devm_snd_soc_register_card(&pdev->dev, card);
+
+	return ret;
+}
+
+static const struct of_device_id loongson_asoc_dt_ids[] = {
+	{ .compatible = "loongson,ls-audio-card" },
+	{ /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, loongson_asoc_dt_ids);
+
+static struct platform_driver loongson_audio_driver = {
+	.probe = loongson_asoc_card_probe,
+	.driver = {
+		.name = "loongson-asoc-card",
+		.pm = &snd_soc_pm_ops,
+		.of_match_table = of_match_ptr(loongson_asoc_dt_ids),
+	},
+};
+module_platform_driver(loongson_audio_driver);
+
+MODULE_DESCRIPTION("Loongson ASoc Sound Card driver");
+MODULE_AUTHOR("Loongson Technology Corporation Limited");
+MODULE_LICENSE("GPL");