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Message-ID:
<SEYPR01MB4221611E6BB87C70B30999E5D7AC2@SEYPR01MB4221.apcprd01.prod.exchangelabs.com>
Date: Thu, 18 Jul 2024 06:49:05 +0000
From: Haylen Chu <heylenay@...look.com>
To: Inochi Amaoto <inochiama@...look.com>,
"Rafael J. Wysocki" <rafael@...nel.org>,
Daniel Lezcano <daniel.lezcano@...aro.org>,
Zhang Rui <rui.zhang@...el.com>, Lukasz Luba <lukasz.luba@....com>,
Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>,
Chen Wang <unicorn_wang@...look.com>,
Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>,
Albert Ou <aou@...s.berkeley.edu>,
Jisheng Zhang <jszhang@...nel.org>
Cc: linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v4 3/3] thermal: cv180x: Add cv180x thermal driver support
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@...look.com>
> > ---
> > 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@...look.com>
> > + */
> > +
> > +#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@...look.com>");
> > +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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