From b3eb755e2db07d85c30e8ff4043ffb9a14b4ece7 Mon Sep 17 00:00:00 2001 From: "Anton D. Stavinskii" Date: Tue, 20 Jan 2026 23:06:07 +0400 Subject: [PATCH] ASoC: sophgo: add CV1800B internal DAC codec driver Codec DAI endpoint for TXDAC. The codec does only a few things - set up decimation - enable codec and I2S output - ensures the driver doesn't have dac overwrite enabled. (unmute the output) Signed-off-by: Anton D. Stavinskii Link: https://patch.msgid.link/20260120-cv1800b-i2s-driver-v4-5-6ef787dc6426@gmail.com Signed-off-by: Mark Brown --- sound/soc/sophgo/Kconfig | 11 +- sound/soc/sophgo/Makefile | 1 + sound/soc/sophgo/cv1800b-sound-dac.c | 204 +++++++++++++++++++++++++++ 3 files changed, 215 insertions(+), 1 deletion(-) create mode 100644 sound/soc/sophgo/cv1800b-sound-dac.c diff --git a/sound/soc/sophgo/Kconfig b/sound/soc/sophgo/Kconfig index 12d1a57ea308..e4786f087589 100644 --- a/sound/soc/sophgo/Kconfig +++ b/sound/soc/sophgo/Kconfig @@ -28,10 +28,19 @@ config SND_SOC_CV1800B_ADC_CODEC help This driver provides an ASoC codec DAI for capture and basic control of the RXADC registers. - Say Y or M to build support for the Sophgo CV1800B internal analog ADC codec block (RXADC). The module will be called cv1800b-sound-adc +config SND_SOC_CV1800B_DAC_CODEC + tristate "Sophgo CV1800B/SG2002 internal DAC codec" + depends on SND_SOC + help + This driver provides an ASoC codec DAI for playback and basic + control of the TXDAC registers. + + Say Y or M to build support for the Sophgo CV1800B + internal analog DAC codec block (TXDAC). + The module will be called cv1800b-sound-dac endmenu diff --git a/sound/soc/sophgo/Makefile b/sound/soc/sophgo/Makefile index c654d6059cbd..ec8dd31efddd 100644 --- a/sound/soc/sophgo/Makefile +++ b/sound/soc/sophgo/Makefile @@ -2,3 +2,4 @@ # Sophgo Platform Support obj-$(CONFIG_SND_SOC_CV1800B_TDM) += cv1800b-tdm.o obj-$(CONFIG_SND_SOC_CV1800B_ADC_CODEC) += cv1800b-sound-adc.o +obj-$(CONFIG_SND_SOC_CV1800B_DAC_CODEC) += cv1800b-sound-dac.o diff --git a/sound/soc/sophgo/cv1800b-sound-dac.c b/sound/soc/sophgo/cv1800b-sound-dac.c new file mode 100644 index 000000000000..ccf386174639 --- /dev/null +++ b/sound/soc/sophgo/cv1800b-sound-dac.c @@ -0,0 +1,204 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Internal DAC codec for cv1800b based CPUs + */ + +#include +#include +#include +#include +#include +#include + +#define CV1800B_TXDAC_CTRL0 0x00 +#define CV1800B_TXDAC_CTRL1 0x04 +#define CV1800B_TXDAC_STATUS 0x08 +#define CV1800B_TXDAC_AFE0 0x0c +#define CV1800B_TXDAC_AFE1 0x10 +#define CV1800B_TXDAC_ANA0 0x20 +#define CV1800B_TXDAC_ANA1 0x24 +#define CV1800B_TXDAC_ANA2 0x28 + +/* cv1800b_TXDAC_CTRL0 */ +#define REG_TXDAC_EN GENMASK(0, 0) +#define REG_I2S_RX_EN GENMASK(1, 1) + +/* cv1800b_TXDAC_CTRL1 */ +#define REG_TXDAC_CIC_OPT GENMASK(1, 0) + +/* cv1800b_TXDAC_AFE0 */ +#define REG_TXDAC_INIT_DLY_CNT GENMASK(5, 0) + +/* cv1800b_TXDAC_ANA2 */ +#define TXDAC_OW_VAL_L_MASK GENMASK(7, 0) +#define TXDAC_OW_VAL_R_MASK GENMASK(15, 8) +#define TXDAC_OW_EN_L_MASK GENMASK(16, 16) +#define TXDAC_OW_EN_R_MASK GENMASK(17, 17) + +struct cv1800b_priv { + void __iomem *regs; + struct device *dev; +}; + +enum decimation_values { + DECIMATION_64 = 0, + DECIMATION_128, + DECIMATION_256, + DECIMATION_512, +}; + +static void cv1800b_dac_enable(struct cv1800b_priv *priv, bool enable) +{ + u32 val; + + val = readl(priv->regs + CV1800B_TXDAC_CTRL0); + val = u32_replace_bits(val, enable, REG_TXDAC_EN); + val = u32_replace_bits(val, enable, REG_I2S_RX_EN); + writel(val, priv->regs + CV1800B_TXDAC_CTRL0); +} + +static void cv1800b_dac_mute(struct cv1800b_priv *priv, bool enable) +{ + u32 val; + + val = readl(priv->regs + CV1800B_TXDAC_ANA2); + val = u32_replace_bits(val, enable, TXDAC_OW_EN_L_MASK); + val = u32_replace_bits(val, enable, TXDAC_OW_EN_R_MASK); + writel(val, priv->regs + CV1800B_TXDAC_ANA2); +} + +static int cv1800b_dac_decimation(struct cv1800b_priv *priv, u8 dec) +{ + u32 val; + + if (dec > 3) + return -EINVAL; + + val = readl(priv->regs + CV1800B_TXDAC_CTRL1); + val = u32_replace_bits(val, dec, REG_TXDAC_CIC_OPT); + writel(val, priv->regs + CV1800B_TXDAC_CTRL1); + return 0; +} + +static int cv1800b_dac_dly(struct cv1800b_priv *priv, u32 dly) +{ + u32 val; + + if (dly > 63) + return -EINVAL; + + val = readl(priv->regs + CV1800B_TXDAC_AFE0); + val = u32_replace_bits(val, dly, REG_TXDAC_INIT_DLY_CNT); + writel(val, priv->regs + CV1800B_TXDAC_AFE0); + return 0; +} + +static int cv1800b_dac_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params, + struct snd_soc_dai *dai) +{ + struct cv1800b_priv *priv = snd_soc_dai_get_drvdata(dai); + int ret; + unsigned int rate = params_rate(params); + + if (rate != 48000) { + dev_err(priv->dev, "rate %u is not supported\n", rate); + return -EINVAL; + } + + cv1800b_dac_mute(priv, false); + /* minimal decimation for 48kHz is 64*/ + ret = cv1800b_dac_decimation(priv, DECIMATION_64); + if (ret) + return ret; + + /* value is taken from vendors driver 48kHz + * tested on sg2000 and sg2002. + */ + ret = cv1800b_dac_dly(priv, 0x19); + if (ret) + return ret; + + return 0; +} + +static int cv1800b_dac_dai_trigger(struct snd_pcm_substream *substream, int cmd, + struct snd_soc_dai *dai) +{ + struct cv1800b_priv *priv = snd_soc_dai_get_drvdata(dai); + + switch (cmd) { + case SNDRV_PCM_TRIGGER_START: + case SNDRV_PCM_TRIGGER_RESUME: + case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: + cv1800b_dac_enable(priv, true); + break; + case SNDRV_PCM_TRIGGER_STOP: + case SNDRV_PCM_TRIGGER_SUSPEND: + case SNDRV_PCM_TRIGGER_PAUSE_PUSH: + cv1800b_dac_enable(priv, false); + break; + default: + return -EINVAL; + } + + return 0; +} + +static const struct snd_soc_dai_ops cv1800b_dac_dai_ops = { + .hw_params = cv1800b_dac_hw_params, + .trigger = cv1800b_dac_dai_trigger, +}; + +static struct snd_soc_dai_driver cv1800b_dac_dai = { + .name = "dac-hifi", + .playback = { .stream_name = "DAC Playback", + .channels_min = 2, + .channels_max = 2, + .rates = SNDRV_PCM_RATE_48000, + .formats = SNDRV_PCM_FMTBIT_S16_LE }, + .ops = &cv1800b_dac_dai_ops, +}; + +static const struct snd_soc_component_driver cv1800b_dac_component = { + .name = "cv1800b-dac-codec", +}; + +static int cv1800b_dac_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct cv1800b_priv *priv; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->dev = dev; + priv->regs = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(priv->regs)) + return PTR_ERR(priv->regs); + + platform_set_drvdata(pdev, priv); + return devm_snd_soc_register_component(&pdev->dev, + &cv1800b_dac_component, + &cv1800b_dac_dai, 1); +} + +static const struct of_device_id cv1800b_dac_of_match[] = { + { .compatible = "sophgo,cv1800b-sound-dac" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, cv1800b_dac_of_match); + +static struct platform_driver cv1800b_dac_driver = { + .probe = cv1800b_dac_probe, + .driver = { + .name = "cv1800b-dac-codec", + .of_match_table = cv1800b_dac_of_match, + }, +}; +module_platform_driver(cv1800b_dac_driver); + +MODULE_DESCRIPTION("DAC codec for CV1800B"); +MODULE_AUTHOR("Anton D. Stavinskii "); +MODULE_LICENSE("GPL"); -- 2.47.3