From patchwork Mon Aug 12 15:00:56 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Bonnefille X-Patchwork-Id: 13760776 Received: from relay9-d.mail.gandi.net (relay9-d.mail.gandi.net [217.70.183.199]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4614C4D112; Mon, 12 Aug 2024 15:01:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.70.183.199 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723474873; cv=none; b=XxBe87IDdKo9X6uY02Xyrl2nWTBeoZB10p32+LGq5v3oYijhv5EQrlSYdjoOuWwA7dVg9rqk3JLjvtJemT9D6Rq5NfYNC9BYz6SCF+IrqVy9NBzxOs0+PGJSw6SBupAje70RKLTju+GwWiwR4SVMBUayhIItVvHjtgu5Gji2SeE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723474873; c=relaxed/simple; bh=PQlPjVrDPUgRAPgwTm0B7JNP4tXrjTJ3OTkiPTB5e/w=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=nniSyyR4Z91Dx0szjRdC4KQuTBs6Dl1YTwfXxDLkBqsogcRRPply8dC8pkThg0ts85GRcqhE0SenLEg5MMHfaxKWMBhgtlpNFP/R6geAttVEmnobg6RYZxL7BpkC/Q8djga7Lu6y0IXsw+XNK05/r+mA0aDWbZd7hAiWzZTNrX8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com; spf=pass smtp.mailfrom=bootlin.com; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b=Bbhrdsta; arc=none smtp.client-ip=217.70.183.199 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bootlin.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b="Bbhrdsta" Received: by mail.gandi.net (Postfix) with ESMTPSA id B2FFCFF806; Mon, 12 Aug 2024 15:01:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1723474868; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=BExSz4iOskUobW1Wtu0GnWkPwUOzbXt3bldw+FebJAE=; b=BbhrdstaVAQv9urtLj+TvNjTyMPJuDNrxfIpcdEp8Qwk3c8hUfIhhC1+TVlRiBK77ZWhB5 8nSsoH8qFkU0ZzWEQOeG5OQjw4Zey6WU/zjJ4jWaThdtX32EuSHq4PVZOrPIP4SCNKCTaE PVH/+cBcKahB589fGzIELj7SjqzTXNiLSuUcIjLT6JmmXdYY8nO7HPD/yOm0O/ddAaWfWc wT5SlQyePeZVS3cJw3GKyZZRDqllDSchUVZHYDQ5rWthGMP7qD1ATKv3k8WdxA3XotD/mF 0/JRJzDBPfmNd+wkK5+fV6mUmkAc1s+LsmDMfDUg8JHh7iNSBEQky+nbVz+M+g== From: Thomas Bonnefille Date: Mon, 12 Aug 2024 17:00:56 +0200 Subject: [PATCH v4 2/3] iio: adc: sophgo-saradc: Add driver for Sophgo CV18XX series SARADC Precedence: bulk X-Mailing-List: linux-iio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240812-sg2002-adc-v4-2-599bdb67592f@bootlin.com> References: <20240812-sg2002-adc-v4-0-599bdb67592f@bootlin.com> In-Reply-To: <20240812-sg2002-adc-v4-0-599bdb67592f@bootlin.com> To: Jonathan Cameron , Lars-Peter Clausen , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Chen Wang , Inochi Amaoto , Paul Walmsley , Palmer Dabbelt , Albert Ou Cc: Thomas Petazzoni , =?utf-8?q?Miqu=C3=A8l_R?= =?utf-8?q?aynal?= , linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, Thomas Bonnefille X-Mailer: b4 0.14.1 X-GND-Sasl: thomas.bonnefille@bootlin.com This adds a driver for the common Sophgo SARADC. Signed-off-by: Thomas Bonnefille --- drivers/iio/adc/Kconfig | 10 ++ drivers/iio/adc/Makefile | 1 + drivers/iio/adc/sophgo-cv18xx-adc.c | 208 ++++++++++++++++++++++++++++++++++++ 3 files changed, 219 insertions(+) diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig index f60fe85a30d5..b10bf26d8e86 100644 --- a/drivers/iio/adc/Kconfig +++ b/drivers/iio/adc/Kconfig @@ -1156,6 +1156,16 @@ config SC27XX_ADC This driver can also be built as a module. If so, the module will be called sc27xx_adc. +config SOPHGO_CV18XX_ADC + tristate "Sophgo CV18XX series SARADC" + depends on ARCH_SOPHGO || COMPILE_TEST + help + Say yes here to build support for the SARADC integrated inside + the Sophgo CV18XX series SoCs. + + This driver can also be built as a module. If so, the module + will be called sophgo_cv18xx_adc. + config SPEAR_ADC tristate "ST SPEAr ADC" depends on PLAT_SPEAR || COMPILE_TEST diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile index d370e066544e..24c241b12ef0 100644 --- a/drivers/iio/adc/Makefile +++ b/drivers/iio/adc/Makefile @@ -105,6 +105,7 @@ obj-$(CONFIG_ROCKCHIP_SARADC) += rockchip_saradc.o obj-$(CONFIG_RZG2L_ADC) += rzg2l_adc.o obj-$(CONFIG_SC27XX_ADC) += sc27xx_adc.o obj-$(CONFIG_SD_ADC_MODULATOR) += sd_adc_modulator.o +obj-$(CONFIG_SOPHGO_CV18XX_ADC) += sophgo-cv18xx-adc.o obj-$(CONFIG_SPEAR_ADC) += spear_adc.o obj-$(CONFIG_STM32_ADC_CORE) += stm32-adc-core.o obj-$(CONFIG_STM32_ADC) += stm32-adc.o diff --git a/drivers/iio/adc/sophgo-cv18xx-adc.c b/drivers/iio/adc/sophgo-cv18xx-adc.c new file mode 100644 index 000000000000..ab7ee0f482cc --- /dev/null +++ b/drivers/iio/adc/sophgo-cv18xx-adc.c @@ -0,0 +1,208 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Sophgo CV18XX series SARADC Driver + * + * Copyright (C) Bootlin 2024 + * Author: Thomas Bonnefille + */ + +#include "linux/err.h" +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define CV18XX_ADC_CTRL_REG 0x04 +#define CV18XX_ADC_EN BIT(0) +#define CV18XX_ADC_SEL(x) BIT((x) + 5) +#define CV18XX_ADC_STATUS_REG 0x08 +#define CV18XX_ADC_BUSY BIT(0) +#define CV18XX_ADC_CYC_SET_REG 0x0C +/* The default cycle configuration is set to maximize the accuracy */ +#define CV18XX_ADC_DEF_STARTUP_CYCLE_MASK 0x1F +#define CV18XX_ADC_DEF_SAMPLE_WINDOW_MASK 0xF00 +#define CV18XX_ADC_DEF_CLOCK_DIVIDER_MASK 0xF000 +#define CV18XX_ADC_DEF_COMPARE_CYCLE_MASK 0xF0000 +#define CV18XX_ADC_CH_RESULT_REG(x) (0x14 + 4 * (x)) +#define CV18XX_ADC_CH_RESULT GENMASK(11, 0) +#define CV18XX_ADC_CH_VALID BIT(15) +#define CV18XX_ADC_INTR_EN_REG 0x20 +#define CV18XX_ADC_INTR_CLR_REG 0x24 +#define CV18XX_ADC_INTR_CLR_BIT BIT(0) +#define CV18XX_ADC_INTR_STA_REG 0x28 +#define CV18XX_ADC_INTR_STA_BIT BIT(0) + +#define CV18XX_ADC_CHANNEL(index) \ + { \ + .type = IIO_VOLTAGE, \ + .indexed = 1, \ + .channel = index, \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ + .scan_index = index, \ + } + +struct cv18xx_adc { + struct completion completion; + void __iomem *regs; + struct mutex lock; /* ADC Control and Result register */ + int irq; +}; + +static const struct iio_chan_spec sophgo_channels[] = { + CV18XX_ADC_CHANNEL(0), + CV18XX_ADC_CHANNEL(1), + CV18XX_ADC_CHANNEL(2), +}; + +static void cv18xx_adc_start_measurement(struct cv18xx_adc *saradc, + int channel) +{ + writel(0, saradc->regs + CV18XX_ADC_CTRL_REG); + writel(CV18XX_ADC_SEL(channel) | CV18XX_ADC_EN, + saradc->regs + CV18XX_ADC_CTRL_REG); +} + +static int cv18xx_adc_wait(struct cv18xx_adc *saradc) +{ + if (saradc->irq < 0) { + u32 reg; + + return readl_poll_timeout(saradc->regs + CV18XX_ADC_STATUS_REG, + reg, !(reg & CV18XX_ADC_BUSY), + 500, 1000000); + } + return wait_for_completion_timeout(&saradc->completion, + msecs_to_jiffies(1000)) > 0 + ? 0 : -ETIMEDOUT; +} + +static int cv18xx_adc_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + + switch (mask) { + case IIO_CHAN_INFO_RAW:{ + struct cv18xx_adc *saradc = iio_priv(indio_dev); + u32 sample; + + scoped_guard(mutex, &saradc->lock) { + int ret; + + cv18xx_adc_start_measurement(saradc, chan->scan_index); + ret = cv18xx_adc_wait(saradc); + if (ret < 0) + return ret; + + sample = readl(saradc->regs + CV18XX_ADC_CH_RESULT_REG(chan->scan_index)); + } + if (!(sample & CV18XX_ADC_CH_VALID)) + return -ENODATA; + + *val = sample & CV18XX_ADC_CH_RESULT; + return IIO_VAL_INT; + } + case IIO_CHAN_INFO_SCALE: + *val = 3300; + *val2 = 12; + return IIO_VAL_FRACTIONAL_LOG2; + default: + return -EINVAL; + } +} + +static irqreturn_t cv18xx_adc_interrupt_handler(int irq, void *private) +{ + struct cv18xx_adc *saradc = private; + + if (!(FIELD_GET(CV18XX_ADC_INTR_STA_BIT, + readl(saradc->regs + CV18XX_ADC_INTR_STA_REG)))) + return IRQ_NONE; + + writel(CV18XX_ADC_INTR_CLR_BIT, saradc->regs + CV18XX_ADC_INTR_CLR_REG); + complete(&saradc->completion); + return IRQ_HANDLED; +} + +static const struct iio_info cv18xx_adc_info = { + .read_raw = &cv18xx_adc_read_raw, +}; + +static int cv18xx_adc_probe(struct platform_device *pdev) +{ + struct cv18xx_adc *saradc; + struct iio_dev *indio_dev; + struct clk *clk; + int ret; + + indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*saradc)); + if (!indio_dev) + return -ENOMEM; + + saradc = iio_priv(indio_dev); + indio_dev->name = "sophgo-cv18xx-adc"; + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->info = &cv18xx_adc_info; + indio_dev->num_channels = ARRAY_SIZE(sophgo_channels); + indio_dev->channels = sophgo_channels; + + clk = devm_clk_get_enabled(&pdev->dev, NULL); + if (IS_ERR(clk)) + return PTR_ERR(clk); + + saradc->regs = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(saradc->regs)) + return PTR_ERR(saradc->regs); + + saradc->irq = platform_get_irq_optional(pdev, 0); + if (saradc->irq >= 0) { + init_completion(&saradc->completion); + ret = devm_request_irq(&pdev->dev, saradc->irq, + cv18xx_adc_interrupt_handler, 0, + dev_name(&pdev->dev), saradc); + if (ret) + return ret; + + writel(1, saradc->regs + CV18XX_ADC_INTR_EN_REG); + } + + ret = devm_mutex_init(&pdev->dev, &saradc->lock); + if (ret) + return ret; + + platform_set_drvdata(pdev, indio_dev); + writel(FIELD_PREP(CV18XX_ADC_DEF_STARTUP_CYCLE_MASK, 0xF) | + FIELD_PREP(CV18XX_ADC_DEF_SAMPLE_WINDOW_MASK, 0xF) | + FIELD_PREP(CV18XX_ADC_DEF_CLOCK_DIVIDER_MASK, 0x1) | + FIELD_PREP(CV18XX_ADC_DEF_COMPARE_CYCLE_MASK, 0xF), + saradc->regs + CV18XX_ADC_CYC_SET_REG); + + return devm_iio_device_register(&pdev->dev, indio_dev); +} + +static const struct of_device_id cv18xx_adc_match[] = { + { .compatible = "sophgo,cv1800b-saradc", }, + { } +}; +MODULE_DEVICE_TABLE(of, cv18xx_adc_match); + +static struct platform_driver cv18xx_adc_driver = { + .driver = { + .name = "sophgo-cv18xx-saradc", + .of_match_table = cv18xx_adc_match, + }, + .probe = cv18xx_adc_probe, +}; +module_platform_driver(cv18xx_adc_driver); + +MODULE_AUTHOR("Thomas Bonnefille "); +MODULE_DESCRIPTION("Sophgo CV18XX series SARADC driver"); +MODULE_LICENSE("GPL");