Re: [PATCH v4 3/3] thermal: cv180x: Add cv180x thermal driver support

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On Wed, Jul 17, 2024 at 02:22:32PM +0800, Inochi Amaoto wrote:
> On Tue, Jul 16, 2024 at 09:42:35AM GMT, Haylen Chu wrote:
> > Add support for cv180x SoCs integrated thermal sensors.
> > 
> > Signed-off-by: Haylen Chu <heylenay@xxxxxxxxxxx>
> > ---
> >  drivers/thermal/Kconfig          |   6 +
> >  drivers/thermal/Makefile         |   1 +
> >  drivers/thermal/cv180x_thermal.c | 241 +++++++++++++++++++++++++++++++
> >  3 files changed, 248 insertions(+)
> >  create mode 100644 drivers/thermal/cv180x_thermal.c
> > 
> > diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
> > index 204ed89a3ec9..f53c973a361d 100644
> > --- a/drivers/thermal/Kconfig
> > +++ b/drivers/thermal/Kconfig
> > @@ -514,4 +514,10 @@ config LOONGSON2_THERMAL
> >  	  is higher than the high temperature threshold or lower than the low
> >  	  temperature threshold, the interrupt will occur.
> >  
> > +config CV180X_THERMAL
> > +	tristate "Temperature sensor driver for Sophgo CV180X"
> > +	help
> > +	  If you say yes here you get support for thermal sensor integrated in
> > +	  Sophgo CV180X SoCs.
> > +
> >  endif
> > diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
> > index 5cdf7d68687f..5b59bde8a579 100644
> > --- a/drivers/thermal/Makefile
> > +++ b/drivers/thermal/Makefile
> > @@ -65,3 +65,4 @@ obj-$(CONFIG_AMLOGIC_THERMAL)     += amlogic_thermal.o
> >  obj-$(CONFIG_SPRD_THERMAL)	+= sprd_thermal.o
> >  obj-$(CONFIG_KHADAS_MCU_FAN_THERMAL)	+= khadas_mcu_fan.o
> >  obj-$(CONFIG_LOONGSON2_THERMAL)	+= loongson2_thermal.o
> > +obj-$(CONFIG_CV180X_THERMAL)	+= cv180x_thermal.o
> > diff --git a/drivers/thermal/cv180x_thermal.c b/drivers/thermal/cv180x_thermal.c
> > new file mode 100644
> > index 000000000000..8b726c0ad848
> > --- /dev/null
> > +++ b/drivers/thermal/cv180x_thermal.c
> > @@ -0,0 +1,241 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Copyright (C) 2021 Sophgo Inc.
> > + * Copyright (C) 2024 Haylen Chu <heylenay@xxxxxxxxxxx>
> > + */
> > +
> > +#include <linux/bits.h>
> > +#include <linux/clk.h>
> > +#include <linux/io.h>
> > +#include <linux/module.h>
> > +#include <linux/of.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/thermal.h>
> > +
> > +#define TEMPSEN_VERSION					0x0
> > +#define TEMPSEN_CTRL					0x4
> > +#define  TEMPSEN_CTRL_EN				BIT(0)
> > +#define  TEMPSEN_CTRL_SEL_MASK				GENMASK(7, 4)
> > +#define  TEMPSEN_CTRL_SEL_OFFSET			4
> > +#define TEMPSEN_STATUS					0x8
> > +#define TEMPSEN_SET					0xc
> > +#define  TEMPSEN_SET_CHOPSEL_MASK			GENMASK(5, 4)
> > +#define  TEMPSEN_SET_CHOPSEL_OFFSET			4
> > +#define  TEMPSEN_SET_CHOPSEL_128T			0
> > +#define  TEMPSEN_SET_CHOPSEL_256T			1
> > +#define  TEMPSEN_SET_CHOPSEL_512T			2
> > +#define  TEMPSEN_SET_CHOPSEL_1024T			3
> > +#define  TEMPSEN_SET_ACCSEL_MASK			GENMASK(7, 6)
> > +#define  TEMPSEN_SET_ACCSEL_OFFSET			6
> > +#define  TEMPSEN_SET_ACCSEL_512T			0
> > +#define  TEMPSEN_SET_ACCSEL_1024T			1
> > +#define  TEMPSEN_SET_ACCSEL_2048T			2
> > +#define  TEMPSEN_SET_ACCSEL_4096T			3
> > +#define  TEMPSEN_SET_CYC_CLKDIV_MASK			GENMASK(15, 8)
> > +#define  TEMPSEN_SET_CYC_CLKDIV_OFFSET			8
> > +#define TEMPSEN_INTR_EN					0x10
> > +#define TEMPSEN_INTR_CLR				0x14
> > +#define TEMPSEN_INTR_STA				0x18
> > +#define TEMPSEN_INTR_RAW				0x1c
> > +#define TEMPSEN_RESULT(n)				(0x20 + (n) * 4)
> > +#define  TEMPSEN_RESULT_RESULT_MASK			GENMASK(12, 0)
> > +#define  TEMPSEN_RESULT_MAX_RESULT_MASK			GENMASK(28, 16)
> > +#define  TEMPSEN_RESULT_CLR_MAX_RESULT			BIT(31)
> > +#define TEMPSEN_AUTO_PERIOD				0x64
> > +#define  TEMPSEN_AUTO_PERIOD_AUTO_CYCLE_MASK		GENMASK(23, 0)
> > +#define  TEMPSEN_AUTO_PERIOD_AUTO_CYCLE_OFFSET		0
> > +
> > +struct cv180x_thermal_zone {
> > +	struct device *dev;
> > +	void __iomem *base;
> > +	struct clk *clk_tempsen;
> > +	u32 sample_cycle;
> > +};
> > +
> > +static void cv180x_thermal_init(struct cv180x_thermal_zone *ctz)
> > +{
> > +	void __iomem *base = ctz->base;
> > +	u32 regval;
> > +
> > +	writel(readl(base + TEMPSEN_INTR_RAW), base + TEMPSEN_INTR_CLR);
> > +	writel(TEMPSEN_RESULT_CLR_MAX_RESULT, base + TEMPSEN_RESULT(0));
> > +
> > +	regval = readl(base + TEMPSEN_SET);
> > +	regval &= ~TEMPSEN_SET_CHOPSEL_MASK;
> > +	regval &= ~TEMPSEN_SET_ACCSEL_MASK;
> > +	regval &= ~TEMPSEN_SET_CYC_CLKDIV_MASK;
> > +	regval |= TEMPSEN_SET_CHOPSEL_1024T << TEMPSEN_SET_CHOPSEL_OFFSET;
> > +	regval |= TEMPSEN_SET_ACCSEL_2048T << TEMPSEN_SET_ACCSEL_OFFSET;
> > +	regval |= 0x31 << TEMPSEN_SET_CYC_CLKDIV_OFFSET;
> > +	writel(regval, base + TEMPSEN_SET);
> > +
> > +	regval = readl(base + TEMPSEN_AUTO_PERIOD);
> > +	regval &= ~TEMPSEN_AUTO_PERIOD_AUTO_CYCLE_MASK;
> > +	regval |= ctz->sample_cycle << TEMPSEN_AUTO_PERIOD_AUTO_CYCLE_OFFSET;
> > +	writel(regval, base + TEMPSEN_AUTO_PERIOD);
> > +
> > +	regval = readl(base + TEMPSEN_CTRL);
> > +	regval &= ~TEMPSEN_CTRL_SEL_MASK;
> > +	regval |= 1 << TEMPSEN_CTRL_SEL_OFFSET;
> > +	regval |= TEMPSEN_CTRL_EN;
> > +	writel(regval, base + TEMPSEN_CTRL);
> > +}
> > +
> > +static void cv180x_thermal_deinit(struct cv180x_thermal_zone *ct)
> > +{
> > +	void __iomem *base = ct->base;
> > +	u32 regval;
> > +
> > +	regval = readl(base + TEMPSEN_CTRL);
> > +	regval &= ~(TEMPSEN_CTRL_SEL_MASK | TEMPSEN_CTRL_EN);
> > +	writel(regval, base + TEMPSEN_CTRL);
> > +
> > +	writel(readl(base + TEMPSEN_INTR_RAW), base + TEMPSEN_INTR_CLR);
> > +}
> > +
> > +/*
> > + *	Raw register value to temperature (mC) formula:
> > + *
> > + *		       read_val * 1000 * 716
> > + *	Temperature = ----------------------- - 273000
> > + *				divider
> > + *
> > + *	where divider should be ticks number of accumulation period,
> > + *	e.g. 2048 for TEMPSEN_CTRL_ACCSEL_2048T
> > + */
> > +static int cv180x_calc_temp(struct cv180x_thermal_zone *ctz, u32 result)
> > +{
> > +	return (result * 1000) * 716 / 2048 - 273000;
> > +}
> > +
> > +static int cv180x_get_temp(struct thermal_zone_device *tdev, int *temperature)
> > +{
> > +	struct cv180x_thermal_zone *ctz = thermal_zone_device_priv(tdev);
> > +	void __iomem *base = ctz->base;
> > +	u32 result;
> > +
> > +	result = readl(base + TEMPSEN_RESULT(0)) & TEMPSEN_RESULT_RESULT_MASK;
> > +	*temperature = cv180x_calc_temp(ctz, result);
> > +
> > +	return 0;
> > +}
> > +
> > +static const struct thermal_zone_device_ops cv180x_thermal_ops = {
> > +	.get_temp = cv180x_get_temp,
> > +};
> > +
> > +static const struct of_device_id cv180x_thermal_of_match[] = {
> > +	{ .compatible = "sophgo,cv1800-thermal" },
> > +	{},
> > +};
> > +MODULE_DEVICE_TABLE(of, cv180x_thermal_of_match);
> > +
> > +static int
> > +cv180x_parse_dt(struct cv180x_thermal_zone *ctz)
> > +{
> > +	struct device_node *np = ctz->dev->of_node;
> > +	u32 tmp;
> > +
> > +	if (of_property_read_u32(np, "sample-rate-hz", &tmp)) {
> > +		ctz->sample_cycle = 1000000;
> > +	} else {
> > +		/* sample cycle should be at least 524us */
> > +		if (tmp > 1000000 / 524) {
> > +			dev_err(ctz->dev, "invalid sample rate %d\n", tmp);
> > +			return -EINVAL;
> > +		}
> > +
> > +		ctz->sample_cycle = 1000000 / tmp;
> > +	}
> > +
> > +	return 0;
> > +}
> > +
> > +static int cv180x_thermal_probe(struct platform_device *pdev)
> > +{
> > +	struct cv180x_thermal_zone *ctz;
> > +	struct thermal_zone_device *tz;
> > +	struct resource *res;
> > +	int ret;
> > +
> > +	ctz = devm_kzalloc(&pdev->dev, sizeof(*ctz), GFP_KERNEL);
> > +	if (!ctz)
> > +		return -ENOMEM;
> > +
> > +	ctz->dev = &pdev->dev;
> > +
> > +	ret = cv180x_parse_dt(ctz);
> > +	if (ret)
> > +		return dev_err_probe(&pdev->dev, ret, "failed to parse dt\n");
> > +
> > +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > +	ctz->base = devm_ioremap_resource(&pdev->dev, res);
> > +	if (IS_ERR(ctz->base))
> > +		return dev_err_probe(&pdev->dev, PTR_ERR(ctz->base),
> > +				     "failed to map tempsen registers\n");
> > +
> > +	ctz->clk_tempsen = devm_clk_get_enabled(&pdev->dev, NULL);
> > +	if (IS_ERR(ctz->clk_tempsen))
> > +		return dev_err_probe(&pdev->dev, PTR_ERR(ctz->clk_tempsen),
> > +				     "failed to get clk_tempsen\n");
> > +
> > +	cv180x_thermal_init(ctz);
> > +
> > +	tz = devm_thermal_of_zone_register(&pdev->dev, 0, ctz,
> > +					   &cv180x_thermal_ops);
> > +	if (IS_ERR(tz))
> > +		return dev_err_probe(&pdev->dev, PTR_ERR(tz),
> > +				     "failed to register thermal zone\n");
> > +
> > +	platform_set_drvdata(pdev, ctz);
> > +
> > +	return 0;
> > +}
> > +
> > +static int cv180x_thermal_remove(struct platform_device *pdev)
> > +{
> > +	struct cv180x_thermal_zone *ctz = platform_get_drvdata(pdev);
> > +
> > +	cv180x_thermal_deinit(ctz);
> > +
> > +	return 0;
> > +}
> > +
> > +static int __maybe_unused cv180x_thermal_suspend(struct device *dev)
> > +{
> > +	struct cv180x_thermal_zone *ctz = dev_get_drvdata(dev);
> > +
> > +	cv180x_thermal_deinit(ctz);
> > +	clk_disable_unprepare(ctz->clk_tempsen);
> > +
> > +	return 0;
> > +}
> > +
> > +static int __maybe_unused cv180x_thermal_resume(struct device *dev)
> > +{
> > +	struct cv180x_thermal_zone *ctz = dev_get_drvdata(dev);
> > +
> > +	clk_prepare_enable(ctz->clk_tempsen);
> > +	cv180x_thermal_init(ctz);
> > +
> > +	return 0;
> > +}
> > +
> > +static SIMPLE_DEV_PM_OPS(cv180x_thermal_pm_ops,
> > +			 cv180x_thermal_suspend, cv180x_thermal_resume);
> > +
> > +static struct platform_driver cv180x_thermal_driver = {
> > +	.probe = cv180x_thermal_probe,
> > +	.remove = cv180x_thermal_remove,
> > +	.driver = {
> > +		.name = "cv180x-thermal",
> > +		.pm = &cv180x_thermal_pm_ops,
> > +		.of_match_table = cv180x_thermal_of_match,
> > +	},
> > +};
> > +
> > +module_platform_driver(cv180x_thermal_driver);
> > +
> > +MODULE_DESCRIPTION("Sophgo CV180x thermal driver");
> > +MODULE_AUTHOR("Haylen Chu <heylenay@xxxxxxxxxxx>");
> > +MODULE_LICENSE("GPL");
> > -- 
> > 2.45.2
> > 
> 
> Where is interrupt handler? I see nothing about it.
> 
> Regards,
> Inochi

Interrupts are not used. This driver implements only polling the
temperature.

Best regards,
Haylen Chu




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