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[94.59.215.181]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4804244c6cesm2005735e9.0.2026.01.20.11.06.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 20 Jan 2026 11:06:25 -0800 (PST) From: "Anton D. Stavinskii" Date: Tue, 20 Jan 2026 23:06:07 +0400 Subject: [PATCH v4 5/6] ASoC: sophgo: add CV1800B internal DAC codec driver Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260120-cv1800b-i2s-driver-v4-5-6ef787dc6426@gmail.com> References: <20260120-cv1800b-i2s-driver-v4-0-6ef787dc6426@gmail.com> In-Reply-To: <20260120-cv1800b-i2s-driver-v4-0-6ef787dc6426@gmail.com> To: Liam Girdwood , Mark Brown , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Chen Wang , Inochi Amaoto , Jaroslav Kysela , Takashi Iwai , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti Cc: linux-sound@vger.kernel.org, devicetree@vger.kernel.org, sophgo@lists.linux.dev, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, "Anton D. Stavinskii" X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=ed25519-sha256; t=1768935966; l=7443; i=stavinsky@gmail.com; s=20260115; h=from:subject:message-id; bh=8E5W83s8zZhlgtflURC3mkpser20n9zf1XMNgYJpTwc=; b=5SXa+MAtOSwv7YCD5OSx/FZfbU/cJTV6VZaWJato1ZDqTKCiWouC+1VTjWMT2wvVJaUxHsqkN Jy4eTqIbgvFA9lnCPCUtynB+HHXpKbS2heJS4xsZa6A1jVfaTOWMPNO X-Developer-Key: i=stavinsky@gmail.com; a=ed25519; pk=2WxGZ1zd1vQwSPFCSks6zrADqUDBUdtq39lElk4ZE7Q= 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 --- 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(-) 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 =20 +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 =20 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-$(CONFIG_SND_SOC_CV1800B_TDM) +=3D cv1800b-tdm.o obj-$(CONFIG_SND_SOC_CV1800B_ADC_CODEC) +=3D cv1800b-sound-adc.o +obj-$(CONFIG_SND_SOC_CV1800B_DAC_CODEC) +=3D cv1800b-sound-dac.o diff --git a/sound/soc/sophgo/cv1800b-sound-dac.c b/sound/soc/sophgo/cv1800= b-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 =3D 0, + DECIMATION_128, + DECIMATION_256, + DECIMATION_512, +}; + +static void cv1800b_dac_enable(struct cv1800b_priv *priv, bool enable) +{ + u32 val; + + val =3D readl(priv->regs + CV1800B_TXDAC_CTRL0); + val =3D u32_replace_bits(val, enable, REG_TXDAC_EN); + val =3D 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 =3D readl(priv->regs + CV1800B_TXDAC_ANA2); + val =3D u32_replace_bits(val, enable, TXDAC_OW_EN_L_MASK); + val =3D 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 =3D readl(priv->regs + CV1800B_TXDAC_CTRL1); + val =3D 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 =3D readl(priv->regs + CV1800B_TXDAC_AFE0); + val =3D 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 =3D snd_soc_dai_get_drvdata(dai); + int ret; + unsigned int rate =3D params_rate(params); + + if (rate !=3D 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 =3D cv1800b_dac_decimation(priv, DECIMATION_64); + if (ret) + return ret; + + /* value is taken from vendors driver 48kHz + * tested on sg2000 and sg2002. + */ + ret =3D cv1800b_dac_dly(priv, 0x19); + if (ret) + return ret; + + return 0; +} + +static int cv1800b_dac_dai_trigger(struct snd_pcm_substream *substream, in= t cmd, + struct snd_soc_dai *dai) +{ + struct cv1800b_priv *priv =3D 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 =3D { + .hw_params =3D cv1800b_dac_hw_params, + .trigger =3D cv1800b_dac_dai_trigger, +}; + +static struct snd_soc_dai_driver cv1800b_dac_dai =3D { + .name =3D "dac-hifi", + .playback =3D { .stream_name =3D "DAC Playback", + .channels_min =3D 2, + .channels_max =3D 2, + .rates =3D SNDRV_PCM_RATE_48000, + .formats =3D SNDRV_PCM_FMTBIT_S16_LE }, + .ops =3D &cv1800b_dac_dai_ops, +}; + +static const struct snd_soc_component_driver cv1800b_dac_component =3D { + .name =3D "cv1800b-dac-codec", +}; + +static int cv1800b_dac_probe(struct platform_device *pdev) +{ + struct device *dev =3D &pdev->dev; + struct cv1800b_priv *priv; + + priv =3D devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->dev =3D dev; + priv->regs =3D 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[] =3D { + { .compatible =3D "sophgo,cv1800b-sound-dac" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, cv1800b_dac_of_match); + +static struct platform_driver cv1800b_dac_driver =3D { + .probe =3D cv1800b_dac_probe, + .driver =3D { + .name =3D "cv1800b-dac-codec", + .of_match_table =3D cv1800b_dac_of_match, + }, +}; +module_platform_driver(cv1800b_dac_driver); + +MODULE_DESCRIPTION("DAC codec for CV1800B"); +MODULE_AUTHOR("Anton D. Stavinskii "); +MODULE_LICENSE("GPL"); --=20 2.43.0