1 files changed, 384 insertions, 0 deletions
diff --git a/sound/soc/starfive/spdif.c b/sound/soc/starfive/spdif.c
new file mode 100644
index 000000000000..f021e99bf7ac
--- /dev/null
+++ b/sound/soc/starfive/spdif.c
@@ -0,0 +1,384 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2021 StarFive Technology Co., Ltd.
+ */
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/clk.h>
+#include <linux/regmap.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/initval.h>
+#include <sound/dmaengine_pcm.h>
+
+#include "spdif.h"
+
+static irqreturn_t spdif_irq_handler(int irq, void *dev_id)
+{
+	struct sf_spdif_dev *dev = dev_id;
+	bool irq_valid = false;
+	unsigned int intr;
+	unsigned int stat;
+
+	regmap_read(dev->regmap, SPDIF_INT_REG, &intr);
+	regmap_read(dev->regmap, SPDIF_STAT_REG, &stat);
+	regmap_update_bits(dev->regmap, SPDIF_CTRL,
+		SPDIF_MASK_ENABLE, 0);
+	regmap_update_bits(dev->regmap, SPDIF_INT_REG,
+		SPDIF_INT_REG_BIT, 0);
+
+	if ((stat & SPDIF_EMPTY_FLAG) || (stat & SPDIF_AEMPTY_FLAG)) {
+		sf_spdif_pcm_push_tx(dev);
+		irq_valid = true;
+	}
+
+	if ((stat & SPDIF_FULL_FLAG) || (stat & SPDIF_AFULL_FLAG)) {
+		sf_spdif_pcm_pop_rx(dev);
+		irq_valid = true;
+	}
+
+	if (stat & SPDIF_PARITY_FLAG) {
+		irq_valid = true;
+	}
+
+	if (stat & SPDIF_UNDERR_FLAG) {
+		irq_valid = true;
+	}
+
+	if (stat & SPDIF_OVRERR_FLAG) {
+		irq_valid = true;
+	}
+
+	if (stat & SPDIF_SYNCERR_FLAG) {
+		irq_valid = true;
+	}
+
+	if (stat & SPDIF_LOCK_FLAG) {
+		irq_valid = true;
+	}
+
+	if (stat & SPDIF_BEGIN_FLAG) {
+		irq_valid = true;
+	}
+
+	if (stat & SPDIF_RIGHT_LEFT) {
+		irq_valid = true;
+	}
+
+	regmap_update_bits(dev->regmap, SPDIF_CTRL,
+		SPDIF_MASK_ENABLE, SPDIF_MASK_ENABLE);
+
+	if (irq_valid)
+		return IRQ_HANDLED;
+	else
+		return IRQ_NONE;
+}
+
+static int sf_spdif_trigger(struct snd_pcm_substream *substream, int cmd,
+	struct snd_soc_dai *dai)
+{
+	struct sf_spdif_dev *spdif = snd_soc_dai_get_drvdata(dai);
+	bool tx;
+
+	tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
+	if (tx) {
+		/* tx mode */
+		regmap_update_bits(spdif->regmap, SPDIF_CTRL,
+			SPDIF_TR_MODE, SPDIF_TR_MODE);
+
+		regmap_update_bits(spdif->regmap, SPDIF_CTRL,
+			SPDIF_MASK_FIFO, SPDIF_EMPTY_MASK | SPDIF_AEMPTY_MASK);
+	} else {
+		/* rx mode */
+		regmap_update_bits(spdif->regmap, SPDIF_CTRL,
+			SPDIF_TR_MODE, 0);
+
+		regmap_update_bits(spdif->regmap, SPDIF_CTRL,
+			SPDIF_MASK_FIFO, SPDIF_FULL_MASK | SPDIF_AFULL_MASK);
+	}
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_RESUME:
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		/* clock recovery form the SPDIF data stream  0:clk_enable */
+		regmap_update_bits(spdif->regmap, SPDIF_CTRL,
+			SPDIF_CLK_ENABLE, 0);
+
+		regmap_update_bits(spdif->regmap, SPDIF_CTRL,
+			SPDIF_ENABLE, SPDIF_ENABLE);
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+		/* clock recovery form the SPDIF data stream  1:power save mode */
+		regmap_update_bits(spdif->regmap, SPDIF_CTRL,
+			SPDIF_CLK_ENABLE, SPDIF_CLK_ENABLE);
+
+		regmap_update_bits(spdif->regmap, SPDIF_CTRL,
+			SPDIF_ENABLE, 0);
+		break;
+	default:
+		printk(KERN_ERR "%s L.%d cmd:%d\n", __func__, __LINE__, cmd);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int sf_spdif_hw_params(struct snd_pcm_substream *substream,
+	struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
+{
+	struct sf_spdif_dev *spdif = snd_soc_dai_get_drvdata(dai);
+	unsigned int channels;
+	unsigned int rate;
+	snd_pcm_format_t format;
+	unsigned int tsamplerate;
+
+	channels = params_channels(params);
+	rate = params_rate(params);
+	format = params_format(params);
+
+	switch (channels) {
+	case 2:
+		break;
+	default:
+		dev_err(dai->dev, "invalid channels number\n");
+		return -EINVAL;
+	}
+
+	switch (format) {
+	case SNDRV_PCM_FORMAT_S16_LE:
+	case SNDRV_PCM_FORMAT_S24_LE:
+	case SNDRV_PCM_FORMAT_S32_LE:
+		break;
+	default:
+		dev_err(spdif->dev, "invalid format\n");
+		return -EINVAL;
+	}
+
+	switch (rate) {
+	case 8000:
+	case 11025:
+	case 16000:
+	case 22050:
+		break;
+	default:
+		printk(KERN_ERR "channel:%d sample rate:%d\n", channels, rate);
+		return -EINVAL;
+	}
+
+	/* 12288000/128=96000 */
+	tsamplerate = (96000 + rate/2)/rate - 1;
+
+	if (rate < 3) {
+		return -EINVAL;
+	}
+
+	/* transmission sample rate */
+	regmap_update_bits(spdif->regmap, SPDIF_CTRL, 0xFF, tsamplerate);
+
+	return 0;
+}
+
+static int sf_spdif_dai_probe(struct snd_soc_dai *dai)
+{
+	struct sf_spdif_dev *spdif = snd_soc_dai_get_drvdata(dai);
+
+	#if 0
+	spdif->play_dma_data.addr = (dma_addr_t)spdif->spdif_base + SPDIF_FIFO_ADDR;
+	spdif->play_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+	spdif->play_dma_data.fifo_size = 16;
+	spdif->play_dma_data.maxburst = 16;
+	spdif->capture_dma_data.addr = (dma_addr_t)spdif->spdif_base + SPDIF_FIFO_ADDR;
+	spdif->capture_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+	spdif->capture_dma_data.fifo_size = 16;
+	spdif->capture_dma_data.maxburst = 16;
+	snd_soc_dai_init_dma_data(dai, &spdif->play_dma_data, &spdif->capture_dma_data);
+	snd_soc_dai_set_drvdata(dai, spdif);
+	#endif
+
+	/* reset */
+	regmap_update_bits(spdif->regmap, SPDIF_CTRL,
+		SPDIF_ENABLE | SPDIF_SFR_ENABLE | SPDIF_FIFO_ENABLE, 0);
+
+	/* clear irq */
+	regmap_update_bits(spdif->regmap, SPDIF_INT_REG,
+		SPDIF_INT_REG_BIT, 0);
+
+	/* power save mode */
+	regmap_update_bits(spdif->regmap, SPDIF_CTRL,
+		SPDIF_CLK_ENABLE, SPDIF_CLK_ENABLE);
+
+	/* power save mode */
+	regmap_update_bits(spdif->regmap, SPDIF_CTRL,
+		SPDIF_CLK_ENABLE, SPDIF_CLK_ENABLE);
+
+	regmap_update_bits(spdif->regmap, SPDIF_CTRL,
+		SPDIF_PARITCHECK|SPDIF_VALIDITYCHECK|SPDIF_DUPLICATE,
+		SPDIF_PARITCHECK|SPDIF_VALIDITYCHECK|SPDIF_DUPLICATE);
+
+	regmap_update_bits(spdif->regmap, SPDIF_CTRL,
+		SPDIF_SETPREAMBB, SPDIF_SETPREAMBB);
+
+	regmap_update_bits(spdif->regmap, SPDIF_INT_REG,
+		0x1FFF<<SPDIF_PREAMBLEDEL, 0x3<<SPDIF_PREAMBLEDEL);
+
+	regmap_update_bits(spdif->regmap, SPDIF_FIFO_CTRL,
+		0xFFFFFFFF, 0x20|(0x20<<SPDIF_AFULL_THRESHOLD));
+
+	regmap_update_bits(spdif->regmap, SPDIF_CTRL,
+		SPDIF_PARITYGEN, SPDIF_PARITYGEN);
+
+	regmap_update_bits(spdif->regmap, SPDIF_CTRL,
+		SPDIF_MASK_ENABLE, SPDIF_MASK_ENABLE);
+
+	/* APB access to FIFO enable, disable if use DMA/FIFO */
+	regmap_update_bits(spdif->regmap, SPDIF_CTRL,
+		SPDIF_USE_FIFO_IF, 0);
+
+	/* two channel */
+	regmap_update_bits(spdif->regmap, SPDIF_CTRL,
+		SPDIF_CHANNEL_MODE, 0);
+
+	return 0;
+}
+
+static const struct snd_soc_dai_ops sf_spdif_dai_ops = {
+	.probe = sf_spdif_dai_probe,
+	.trigger = sf_spdif_trigger,
+	.hw_params = sf_spdif_hw_params,
+};
+
+#define SF_PCM_RATE_44100_192000  (SNDRV_PCM_RATE_44100 | \
+									SNDRV_PCM_RATE_48000 | \
+									SNDRV_PCM_RATE_96000 | \
+									SNDRV_PCM_RATE_192000)
+
+#define SF_PCM_RATE_8000_22050  (SNDRV_PCM_RATE_8000 | \
+									SNDRV_PCM_RATE_11025 | \
+									SNDRV_PCM_RATE_16000 | \
+									SNDRV_PCM_RATE_22050)
+
+static struct snd_soc_dai_driver sf_spdif_dai = {
+	.name = "spdif",
+	.id = 0,
+	.playback = {
+		.stream_name = "Playback",
+		.channels_min = 2,
+		.channels_max = 2,
+		.rates = SF_PCM_RATE_8000_22050,
+		.formats = SNDRV_PCM_FMTBIT_S16_LE \
+					|SNDRV_PCM_FMTBIT_S24_LE \
+					|SNDRV_PCM_FMTBIT_S32_LE,
+	},
+	.capture = {
+		.stream_name = "Capture",
+		.channels_min = 2,
+		.channels_max = 2,
+		.rates = SF_PCM_RATE_8000_22050,
+		.formats = SNDRV_PCM_FMTBIT_S16_LE \
+					|SNDRV_PCM_FMTBIT_S24_LE \
+					|SNDRV_PCM_FMTBIT_S32_LE,
+	},
+	.ops = &sf_spdif_dai_ops,
+	.symmetric_rate = 1,
+};
+
+static const struct snd_soc_component_driver sf_spdif_component = {
+	.name = "sf-spdif",
+};
+
+static const struct regmap_config sf_spdif_regmap_config = {
+	.reg_bits = 32,
+	.reg_stride = 4,
+	.val_bits = 32,
+	.max_register = 0x200,
+};
+
+static int sf_spdif_probe(struct platform_device *pdev)
+{
+	struct sf_spdif_dev *spdif;
+	struct resource *res;
+	void __iomem *base;
+	int ret;
+	int irq;
+
+	spdif = devm_kzalloc(&pdev->dev, sizeof(*spdif), GFP_KERNEL);
+	if (!spdif)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, spdif);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(base))
+		return PTR_ERR(base);
+
+	spdif->spdif_base = base;
+	spdif->regmap = devm_regmap_init_mmio(&pdev->dev, spdif->spdif_base,
+					&sf_spdif_regmap_config);
+	if (IS_ERR(spdif->regmap))
+		return PTR_ERR(spdif->regmap);
+
+	spdif->dev = &pdev->dev;
+	spdif->fifo_th = 16;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq >= 0) {
+		ret = devm_request_irq(&pdev->dev, irq, spdif_irq_handler, 0,
+				pdev->name, spdif);
+		if (ret < 0) {
+			dev_err(&pdev->dev, "failed to request irq\n");
+			return ret;
+		}
+	}
+
+	ret = devm_snd_soc_register_component(&pdev->dev, &sf_spdif_component,
+					 &sf_spdif_dai, 1);
+	if (ret)
+		goto err_clk_disable;
+
+	if (irq >= 0) {
+		ret = sf_spdif_pcm_register(pdev);
+		spdif->use_pio = true;
+	} else {
+		ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL,
+					0);
+		spdif->use_pio = false;
+	}
+
+	if (ret)
+		goto err_clk_disable;
+
+	return 0;
+
+err_clk_disable:
+	return ret;
+}
+
+static const struct of_device_id sf_spdif_of_match[] = {
+	{ .compatible = "starfive,sf-spdif", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, sf_spdif_of_match);
+
+static struct platform_driver sf_spdif_driver = {
+	.driver = {
+		.name = "sf-spdif",
+		.of_match_table = sf_spdif_of_match,
+	},
+	.probe = sf_spdif_probe,
+};
+module_platform_driver(sf_spdif_driver);
+
+MODULE_AUTHOR("michael.yan <michael.yan@starfive.com>");
+MODULE_DESCRIPTION("starfive SPDIF driver");
+MODULE_LICENSE("GPL v2");