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Subject: Re: [PATCH] adc: add adc driver for Hisilicon BVT SOCs
To: Allen Liu <liurenzhong@hisilicon.com>, <jic23@kernel.org>,
        <knaack.h@gmx.de>, <lars@metafoo.de>, <pmeerw@pmeerw.net>,
        <robh+dt@kernel.org>, <mark.rutland@arm.com>
References: <1482544497-136656-1-git-send-email-liurenzhong@hisilicon.com>
CC: <yanhaifeng@hisilicon.com>, <hermit.wangheming@hisilicon.com>,
        <akinobu.mita@gmail.com>, <ludovic.desroches@atmel.com>,
        <krzk@kernel.org>, <vilhelm.gray@gmail.com>,
        <ksenija.stanojevic@gmail.com>, <zhiyong.tao@mediatek.com>,
        <daniel.baluta@intel.com>, <leonard.crestez@intel.com>,
        <ray.jui@broadcom.com>, <raveendra.padasalagi@broadcom.com>,
        <mranostay@gmail.com>, <amsfield22@gmail.com>,
        <linux-iio@vger.kernel.org>, <devicetree@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>, <kevin.lixu@hisilicon.com>
From: Jiancheng Xue <xuejiancheng@hisilicon.com>
Message-ID: <ca1f0010-4ac7-9a0f-6fad-f1c55626400e@hisilicon.com>
Date: Sat, 24 Dec 2016 10:31:47 +0800
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On 2016/12/24 9:54, Allen Liu wrote:
> Add ADC driver for the ADC controller found on HiSilicon BVT SOCs, like Hi3516CV300, etc.
> The ADC controller is primarily in charge of detecting voltage.
> 
> Reviewed-by: Jiancheng Xue <xuejiancheng@hisilicon.com>
Hi

Sorry. I haven't reviewed this patch. Please remove this line. Thank you!

Regards,
Jiancheng

> Signed-off-by: Allen Liu <liurenzhong@hisilicon.com>
> ---
>  .../devicetree/bindings/iio/adc/hibvt-lsadc.txt    |  26 ++
>  drivers/iio/adc/Kconfig                            |  10 +
>  drivers/iio/adc/Makefile                           |   1 +
>  drivers/iio/adc/hibvt_lsadc.c                      | 344 +++++++++++++++++++++
>  4 files changed, 381 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/adc/hibvt-lsadc.txt
>  create mode 100644 drivers/iio/adc/hibvt_lsadc.c
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/hibvt-lsadc.txt b/Documentation/devicetree/bindings/iio/adc/hibvt-lsadc.txt
> new file mode 100644
> index 0000000..63de46e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/adc/hibvt-lsadc.txt
> @@ -0,0 +1,26 @@
> +Hisilicon BVT Low Speed (LS) A/D Converter bindings
> +
> +Required properties:
> +- compatible: should be "hisilicon,<name>-lsadc"
> +   - "hisilicon,hibvt-lsadc": for hi3516cv300
> +
> +- reg: physical base address of the controller and length of memory mapped
> +       region.
> +- interrupts: The interrupt number to the cpu. The interrupt specifier format
> +              depends on the interrupt controller.
> +- #io-channel-cells: Should be 1, see ../iio-bindings.txt
> +
> +Optional properties:
> +- resets: Must contain an entry for each entry in reset-names if need support
> +	  this option. See ../reset/reset.txt for details.
> +- reset-names: Must include the name "saradc-apb".
> +
> +Example:
> +	lsadc: hibvt-lsadc@120e0000 {
> +			compatible = "hisilicon,hibvt-lsadc";
> +			reg = <0x120e0000 0x1000>;
> +			interrupts = <19>;
> +			resets = <&crg 0x7c 3>;
> +			reset-names = "lsadc-crg";
> +			status = "disabled";
> +	};
> diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
> index 99c0514..0443f51 100644
> --- a/drivers/iio/adc/Kconfig
> +++ b/drivers/iio/adc/Kconfig
> @@ -225,6 +225,16 @@ config HI8435
>  	  This driver can also be built as a module. If so, the module will be
>  	  called hi8435.
>  
> +config HIBVT_LSADC
> +	tristate "HIBVT LSADC driver"
> +	depends on ARCH_HISI || COMPILE_TEST
> +	help
> +	  Say yes here to build support for the LSADC found in SoCs from
> +	  hisilicon BVT chip.
> +
> +	  To compile this driver as a module, choose M here: the
> +	  module will be called hibvt_lsadc.
> +
>  config INA2XX_ADC
>  	tristate "Texas Instruments INA2xx Power Monitors IIO driver"
>  	depends on I2C && !SENSORS_INA2XX
> diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
> index 7a40c04..6554d92 100644
> --- a/drivers/iio/adc/Makefile
> +++ b/drivers/iio/adc/Makefile
> @@ -23,6 +23,7 @@ obj-$(CONFIG_DA9150_GPADC) += da9150-gpadc.o
>  obj-$(CONFIG_EXYNOS_ADC) += exynos_adc.o
>  obj-$(CONFIG_FSL_MX25_ADC) += fsl-imx25-gcq.o
>  obj-$(CONFIG_HI8435) += hi8435.o
> +obj-$(CONFIG_HIBVT_LSADC) += hibvt_lsadc.o
>  obj-$(CONFIG_IMX7D_ADC) += imx7d_adc.o
>  obj-$(CONFIG_INA2XX_ADC) += ina2xx-adc.o
>  obj-$(CONFIG_LP8788_ADC) += lp8788_adc.o
> diff --git a/drivers/iio/adc/hibvt_lsadc.c b/drivers/iio/adc/hibvt_lsadc.c
> new file mode 100644
> index 0000000..a20afe8
> --- /dev/null
> +++ b/drivers/iio/adc/hibvt_lsadc.c
> @@ -0,0 +1,344 @@
> +/*
> + * Hisilicon BVT Low Speed (LS) A/D Converter
> + * Copyright (C) 2016 HiSilicon Technologies Co., Ltd.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/interrupt.h>
> +#include <linux/io.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +#include <linux/clk.h>
> +#include <linux/completion.h>
> +#include <linux/delay.h>
> +#include <linux/reset.h>
> +#include <linux/regulator/consumer.h>
> +#include <linux/iio/iio.h>
> +
> +/* hisilicon bvt adc registers definitions */
> +#define LSADC_CONFIG		0x00
> +#define CONFIG_DEGLITCH		BIT(17)
> +#define CONFIG_RESET		BIT(15)
> +#define CONFIG_POWERDOWN	BIT(14)
> +#define CONFIG_MODE			BIT(13)
> +#define CONFIG_CHC_VALID	BIT(10)
> +#define CONFIG_CHB_VALID	BIT(9)
> +#define CONFIG_CHA_VALID	BIT(8)
> +
> +#define LSADC_TIMESCAN		0x08
> +#define LSADC_INTEN			0x10
> +#define LSADC_INTSTATUS		0x14
> +#define LSADC_INTCLR		0x18
> +#define LSADC_START			0x1C
> +#define LSADC_STOP			0x20
> +#define LSADC_ACTBIT		0x24
> +#define LSADC_CHNDATA		0x2C
> +
> +#define ADC_CON_EN			(1u << 0)
> +#define ADC_CON_DEN			(0u << 0)
> +
> +#define ADC_NUM_BITS		10
> +
> +/* fix clk:3000000, default tscan set 10ms */
> +#define DEF_ADC_TSCAN_MS	(10*3000)
> +
> +#define LSADC_CHN_MASK		0x7
> +
> +#define LSADC_TIMEOUT		msecs_to_jiffies(100)
> +
> +/* default voltage scale for every channel <mv> */
> +static int g_voltage[] = {
> +	3300, 3300, 3300
> +};
> +
> +struct hibvt_lsadc {
> +	void __iomem		*regs;
> +	struct completion	completion;
> +	struct reset_control	*reset;
> +	const struct hibvt_lsadc_data	*data;
> +	unsigned int		cur_chn;
> +	unsigned int		value;
> +};
> +
> +struct hibvt_lsadc_data {
> +	int				num_bits;
> +	const struct iio_chan_spec	*channels;
> +	int				num_channels;
> +
> +	void (*clear_irq)(struct hibvt_lsadc *info, int mask);
> +	void (*start_conv)(struct hibvt_lsadc *info);
> +	void (*stop_conv)(struct hibvt_lsadc *info);
> +};
> +
> +static int hibvt_lsadc_read_raw(struct iio_dev *indio_dev,
> +				    struct iio_chan_spec const *chan,
> +				    int *val, int *val2, long mask)
> +{
> +	struct hibvt_lsadc *info = iio_priv(indio_dev);
> +
> +	switch (mask) {
> +	case IIO_CHAN_INFO_RAW:
> +		mutex_lock(&indio_dev->mlock);
> +
> +		reinit_completion(&info->completion);
> +
> +		/* Select the channel to be used */
> +		info->cur_chn = chan->channel;
> +
> +		if (info->data->start_conv)
> +			info->data->start_conv(info);
> +
> +		if (!wait_for_completion_timeout(&info->completion,
> +							LSADC_TIMEOUT)) {
> +			if (info->data->stop_conv)
> +				info->data->stop_conv(info);
> +			mutex_unlock(&indio_dev->mlock);
> +			return -ETIMEDOUT;
> +		}
> +
> +		*val = info->value;
> +		mutex_unlock(&indio_dev->mlock);
> +		return IIO_VAL_INT;
> +	case IIO_CHAN_INFO_SCALE:
> +		*val = g_voltage[chan->channel];
> +		*val2 = info->data->num_bits;
> +		return IIO_VAL_FRACTIONAL_LOG2;
> +	default:
> +		return -EINVAL;
> +	}
> +}
> +
> +static irqreturn_t hibvt_lsadc_isr(int irq, void *dev_id)
> +{
> +	struct hibvt_lsadc *info = (struct hibvt_lsadc *)dev_id;
> +	int mask;
> +
> +	mask = readl(info->regs + LSADC_INTSTATUS);
> +	mask &= LSADC_CHN_MASK;
> +
> +	/* Clear irq */
> +	if (info->data->clear_irq)
> +		info->data->clear_irq(info, mask);
> +
> +	/* Read value */
> +	info->value = readl(info->regs + LSADC_CHNDATA + (info->cur_chn << 2));
> +	info->value &= GENMASK(info->data->num_bits - 1, 0);
> +
> +	/* stop adc */
> +	if (info->data->stop_conv)
> +		info->data->stop_conv(info);
> +
> +	complete(&info->completion);
> +
> +	return IRQ_HANDLED;
> +}
> +
> +static const struct iio_info hibvt_lsadc_iio_info = {
> +	.read_raw = hibvt_lsadc_read_raw,
> +	.driver_module = THIS_MODULE,
> +};
> +
> +#define ADC_CHANNEL(_index, _id) {      \
> +	.type = IIO_VOLTAGE,                \
> +	.indexed = 1,						\
> +	.channel = _index,					\
> +	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |  \
> +			BIT(IIO_CHAN_INFO_SCALE),   \
> +	.datasheet_name = _id,              \
> +}
> +
> +static const struct iio_chan_spec hibvt_lsadc_iio_channels[] = {
> +	ADC_CHANNEL(0, "adc0"),
> +	ADC_CHANNEL(1, "adc1"),
> +	ADC_CHANNEL(2, "adc2"),
> +};
> +
> +static void hibvt_lsadc_clear_irq(struct hibvt_lsadc *info, int mask)
> +{
> +	writel(mask, info->regs + LSADC_INTCLR);
> +}
> +
> +static void hibvt_lsadc_start_conv(struct hibvt_lsadc *info)
> +{
> +	unsigned int con;
> +
> +	/* set number bit */
> +	con = GENMASK(info->data->num_bits - 1, 0);
> +	writel(con, (info->regs + LSADC_ACTBIT));
> +
> +    /* config */
> +	con = readl(info->regs + LSADC_CONFIG);
> +	con &= ~CONFIG_RESET;
> +	con |= (CONFIG_POWERDOWN | CONFIG_DEGLITCH | CONFIG_MODE);
> +	con &= ~(CONFIG_CHA_VALID | CONFIG_CHB_VALID | CONFIG_CHC_VALID);
> +	con |= (CONFIG_CHA_VALID << info->cur_chn);
> +	writel(con, (info->regs + LSADC_CONFIG));
> +
> +	/* set timescan */
> +	writel(DEF_ADC_TSCAN_MS, (info->regs + LSADC_TIMESCAN));
> +
> +	/* clear interrupt */
> +	writel(LSADC_CHN_MASK, info->regs + LSADC_INTCLR);
> +
> +	/* enable interrupt */
> +	writel(ADC_CON_EN, (info->regs + LSADC_INTEN));
> +
> +	/* start scan */
> +	writel(ADC_CON_EN, (info->regs + LSADC_START));
> +}
> +
> +static void hibvt_lsadc_stop_conv(struct hibvt_lsadc *info)
> +{
> +	/* reset the timescan */
> +	writel(ADC_CON_DEN, (info->regs + LSADC_TIMESCAN));
> +
> +	/* disable interrupt */
> +	writel(ADC_CON_DEN, (info->regs + LSADC_INTEN));
> +
> +	/* stop scan */
> +	writel(ADC_CON_EN, (info->regs + LSADC_STOP));
> +}
> +
> +static const struct hibvt_lsadc_data lsadc_data = {
> +	.num_bits = ADC_NUM_BITS,
> +	.channels = hibvt_lsadc_iio_channels,
> +	.num_channels = ARRAY_SIZE(hibvt_lsadc_iio_channels),
> +
> +	.clear_irq	= hibvt_lsadc_clear_irq,
> +	.start_conv	= hibvt_lsadc_start_conv,
> +	.stop_conv = hibvt_lsadc_stop_conv,
> +};
> +
> +static const struct of_device_id hibvt_lsadc_match[] = {
> +	{
> +		.compatible = "hisilicon,hibvt-lsadc",
> +		.data = &lsadc_data,
> +	},
> +	{},
> +};
> +MODULE_DEVICE_TABLE(of, hibvt_lsadc_match);
> +
> +/**
> + * Reset LSADC Controller.
> + */
> +static void hibvt_lsadc_reset_controller(struct reset_control *reset)
> +{
> +	reset_control_assert(reset);
> +	usleep_range(10, 20);
> +	reset_control_deassert(reset);
> +}
> +
> +static int hibvt_lsadc_probe(struct platform_device *pdev)
> +{
> +	struct hibvt_lsadc *info = NULL;
> +	struct device_node *np = pdev->dev.of_node;
> +	struct iio_dev *indio_dev = NULL;
> +	struct resource	*mem;
> +	const struct of_device_id *match;
> +	int ret;
> +	int irq;
> +
> +	if (!np)
> +		return -ENODEV;
> +
> +	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*info));
> +	if (!indio_dev) {
> +		dev_err(&pdev->dev, "failed allocating iio device\n");
> +		return -ENOMEM;
> +	}
> +	info = iio_priv(indio_dev);
> +
> +	match = of_match_device(hibvt_lsadc_match, &pdev->dev);
> +	info->data = match->data;
> +
> +	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	info->regs = devm_ioremap_resource(&pdev->dev, mem);
> +	if (IS_ERR(info->regs))
> +		return PTR_ERR(info->regs);
> +
> +	/*
> +	 * The reset should be an optional property, as it should work
> +	 * with old devicetrees as well
> +	 */
> +	info->reset = devm_reset_control_get(&pdev->dev, "lsadc-crg");
> +	if (IS_ERR(info->reset)) {
> +		ret = PTR_ERR(info->reset);
> +		if (ret != -ENOENT)
> +			return ret;
> +
> +		dev_dbg(&pdev->dev, "no reset control found\n");
> +		info->reset = NULL;
> +	}
> +
> +	init_completion(&info->completion);
> +
> +	irq = platform_get_irq(pdev, 0);
> +	if (irq < 0) {
> +		dev_err(&pdev->dev, "no irq resource?\n");
> +		return irq;
> +	}
> +
> +	ret = devm_request_irq(&pdev->dev, irq, hibvt_lsadc_isr,
> +			       0, dev_name(&pdev->dev), info);
> +	if (ret < 0) {
> +		dev_err(&pdev->dev, "failed requesting irq %d\n", irq);
> +		return ret;
> +	}
> +
> +	if (info->reset)
> +		hibvt_lsadc_reset_controller(info->reset);
> +
> +	platform_set_drvdata(pdev, indio_dev);
> +
> +	indio_dev->name = dev_name(&pdev->dev);
> +	indio_dev->dev.parent = &pdev->dev;
> +	indio_dev->dev.of_node = pdev->dev.of_node;
> +	indio_dev->info = &hibvt_lsadc_iio_info;
> +	indio_dev->modes = INDIO_DIRECT_MODE;
> +
> +	indio_dev->channels = info->data->channels;
> +	indio_dev->num_channels = info->data->num_channels;
> +
> +	ret = iio_device_register(indio_dev);
> +	if (ret < 0) {
> +		dev_err(&pdev->dev, "failed register iio device\n");
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static int hibvt_lsadc_remove(struct platform_device *pdev)
> +{
> +	struct iio_dev *indio_dev = platform_get_drvdata(pdev);
> +
> +	iio_device_unregister(indio_dev);
> +
> +	return 0;
> +}
> +
> +static struct platform_driver hibvt_lsadc_driver = {
> +	.probe		= hibvt_lsadc_probe,
> +	.remove		= hibvt_lsadc_remove,
> +	.driver		= {
> +		.name	= "hibvt-lsadc",
> +		.of_match_table = hibvt_lsadc_match,
> +	},
> +};
> +
> +module_platform_driver(hibvt_lsadc_driver);
> +
> +MODULE_AUTHOR("Allen Liu <liurenzhong@hisilicon.com>");
> +MODULE_DESCRIPTION("hisilicon BVT LSADC driver");
> +MODULE_LICENSE("GPL v2");
>