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SubjectRe: [PATCH v13 1/2] thermal: loongson-2: add thermal management support
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Friendly ping ?

在 2023/2/21 下午5:53, Yinbo Zhu 写道:
> This patch adds the support for Loongson-2 thermal sensor controller,
> which can support maximum 4 sensors, each sensor contains a sampling
> register and a control register. The sampling register is used to obtain
> the temperature in real time, the control register GATE field is used to
> set the threshold of high or low temperature, when the input temperature
> is higher than the high temperature threshold or lower than the low
> temperature threshold, an interrupt will occur.
>
> Signed-off-by: zhanghongchen <zhanghongchen@loongson.cn>
> Signed-off-by: Yinbo Zhu <zhuyinbo@loongson.cn>
> ---
> Change in v13:
> 1. Add a description about that how works the sensor.
> 2. Drop the COMPILE_TEST.
> 3. Rework the help prograph in LOONGSON2_THERMAL Kconfig.
> 4. Drop the 'tzd' 'irq' and 'pdev' element in loongson2_thermal_data.
> 5. Drop the reset of variable in loongson2_thermal_set.
> 6. Drop the function loongson2_thermal_get_sensor_id.
> 7. Drop the function loongson2_thermal_alarm_irq.
> 8. Rework the devm_thermal_of_zone_register.
> 9. Pass 'tzd' instead of 'data' in devm_request_threaded_irq.
> 10. Drop the "data->tzd->tzp->no_hwmon = false".
> 11. Drop the loongson2_thermal_remove.
> 12. Add the sensor id in the of_device_id data field.
> 13. Drop the save and restore function.
> Change in v12:
> 1. Fixup it about min and max.
> 2. Use dev_err_probe replace dev_err in devm_request_threaded_irq context.
> Change in v11:
> 1. Add min() and max() to replace related code in function
> loongson2_thermal_set.
> 2. Add dev_err_probe to to replace related code for function
> return value use devm_thermal_of_zone_register.
> 3. Replace thermal_add_hwmon_sysfs with devm_thermal_add_hwmon_sysfs
> and use dev_warn replace dev_err in this context.
> Change in v10:
> 1. Add all history change log information.
> Change in v9:
> 1. Switch new API that use devm_thermal_of_zone_register
> to replace previous interfaces.
> 2. Add depend on LOONGARCH || COMPILE_TEST.
> Change in v8:
> 1. Replace string loongson2/Loongson2/LOONGSON2 with loongson-2/
> Loongson-2/LOONGSON-2 in Kconfig and commit log and MAINTAINERS
> files.
> Change in v7:
> 1. Split the modification of patch 3 and merge it into this patch.
> 2. Remove the unless code annotation to fix the compile warning
> when compile C code with W=1.
> Change in v6:
> 1. NO change, but other patch in this series of patches set has
> changes.
> Change in v5:
> 1. NO change, but other patch in this series of patches set has
> changes.
> Change in v4:
> 1. Fixup the compatible.
> Change in v3:
> 1. Add a function to gain sensor id an remove dts id.
> Change in v2:
> 1. Remove error msg printing when addr ioremap has error.
> 2. Make loongson2 thermal driver was built-in by default.
> 3. Replace ls2k with loongson2.
> 4. Remove CONFIG_PM_SLEEP and set pm function type was
> __maybe_unused.
>
> MAINTAINERS | 7 ++
> drivers/thermal/Kconfig | 11 ++
> drivers/thermal/Makefile | 1 +
> drivers/thermal/loongson2_thermal.c | 167 ++++++++++++++++++++++++++++
> 4 files changed, 186 insertions(+)
> create mode 100644 drivers/thermal/loongson2_thermal.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 57d1d6ecb33d..54e63f51ae6d 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -12086,6 +12086,13 @@ S: Maintained
> F: Documentation/devicetree/bindings/pinctrl/loongson,ls2k-pinctrl.yaml
> F: drivers/pinctrl/pinctrl-loongson2.c
>
> +LOONGSON-2 SOC SERIES THERMAL DRIVER
> +M: zhanghongchen <zhanghongchen@loongson.cn>
> +M: Yinbo Zhu <zhuyinbo@loongson.cn>
> +L: linux-pm@vger.kernel.org
> +S: Maintained
> +F: drivers/thermal/loongson2_thermal.c
> +
> LSILOGIC MPT FUSION DRIVERS (FC/SAS/SPI)
> M: Sathya Prakash <sathya.prakash@broadcom.com>
> M: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
> diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
> index eaeb2b2ee6e9..d4b5ecead80e 100644
> --- a/drivers/thermal/Kconfig
> +++ b/drivers/thermal/Kconfig
> @@ -508,4 +508,15 @@ config KHADAS_MCU_FAN_THERMAL
> If you say yes here you get support for the FAN controlled
> by the Microcontroller found on the Khadas VIM boards.
>
> +config LOONGSON2_THERMAL
> + tristate "Loongson-2 SoC series thermal driver"
> + depends on LOONGARCH && OF
> + help
> + Support for Thermal driver found on Loongson-2 SoC series platforms.
> + The thermal driver realizes get_temp and set_trips function, which
> + are used to obtain the temperature of the current node and set the
> + temperature range to trigger the interrupt. When the input temperature
> + is higher than the high temperature threshold or lower than the low
> + temperature threshold, the interrupt will occur.
> +
> endif
> diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
> index b9b5dc86f5fd..bfc928f70f6d 100644
> --- a/drivers/thermal/Makefile
> +++ b/drivers/thermal/Makefile
> @@ -62,3 +62,4 @@ obj-$(CONFIG_UNIPHIER_THERMAL) += uniphier_thermal.o
> obj-$(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
> diff --git a/drivers/thermal/loongson2_thermal.c b/drivers/thermal/loongson2_thermal.c
> new file mode 100644
> index 000000000000..7d5f32f50c0c
> --- /dev/null
> +++ b/drivers/thermal/loongson2_thermal.c
> @@ -0,0 +1,167 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Author: zhanghongchen <zhanghongchen@loongson.cn>
> + * Yinbo Zhu <zhuyinbo@loongson.cn>
> + * Copyright (C) 2022-2023 Loongson Technology Corporation Limited
> + */
> +
> +#include <linux/cpufreq.h>
> +#include <linux/delay.h>
> +#include <linux/interrupt.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/io.h>
> +#include <linux/of_device.h>
> +#include <linux/thermal.h>
> +#include "thermal_hwmon.h"
> +
> +#define LOONGSON2_SOC_MAX_SENSOR_NUM 4
> +
> +#define LOONGSON2_TSENSOR_CTRL_HI 0x0
> +#define LOONGSON2_TSENSOR_CTRL_LO 0x8
> +#define LOONGSON2_TSENSOR_STATUS 0x10
> +#define LOONGSON2_TSENSOR_OUT 0x14
> +
> +struct loongson2_thermal_data {
> + int id;
> + void __iomem *regs;
> +};
> +
> +static int loongson2_thermal_set(struct loongson2_thermal_data *data,
> + int low, int high, bool enable)
> +{
> + u64 reg_ctrl = 0;
> + int reg_off = data->id * 2;
> +
> + if (low > high)
> + return -EINVAL;
> +
> + low = max(low, -40);
> + high = min(high, 125);
> +
> + low += 100;
> + high += 100;
> +
> + reg_ctrl = low;
> + reg_ctrl |= enable ? 0x100 : 0;
> + writew(reg_ctrl, data->regs + LOONGSON2_TSENSOR_CTRL_LO + reg_off);
> +
> + reg_ctrl = high;
> + reg_ctrl |= enable ? 0x100 : 0;
> + writew(reg_ctrl, data->regs + LOONGSON2_TSENSOR_CTRL_HI + reg_off);
> +
> + return 0;
> +}
> +
> +static int loongson2_thermal_get_temp(struct thermal_zone_device *tz, int *temp)
> +{
> + u32 reg_val;
> + struct loongson2_thermal_data *data = tz->devdata;
> +
> + reg_val = readl(data->regs + LOONGSON2_TSENSOR_OUT);
> + *temp = ((reg_val & 0xff) - 100) * 1000;
> +
> + return 0;
> +}
> +
> +static irqreturn_t loongson2_thermal_irq_thread(int irq, void *dev)
> +{
> + struct thermal_zone_device *tzd = dev;
> + struct loongson2_thermal_data *data = tzd->devdata;
> +
> + /* clear interrupt */
> + writeb(0x3, data->regs + LOONGSON2_TSENSOR_STATUS);
> +
> + thermal_zone_device_update(tzd, THERMAL_EVENT_UNSPECIFIED);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static int loongson2_thermal_set_trips(struct thermal_zone_device *tz, int low, int high)
> +{
> + struct loongson2_thermal_data *data = tz->devdata;
> +
> + return loongson2_thermal_set(data, low/1000, high/1000, true);
> +}
> +
> +static const struct thermal_zone_device_ops loongson2_of_thermal_ops = {
> + .get_temp = loongson2_thermal_get_temp,
> + .set_trips = loongson2_thermal_set_trips,
> +};
> +
> +static int loongson2_thermal_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct resource *res;
> + struct loongson2_thermal_data *data;
> + struct thermal_zone_device *tzd;
> + int ret, irq, i;
> +
> + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
> + if (!data)
> + return -ENOMEM;
> +
> + data->id = (uintptr_t)device_get_match_data(dev);
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + data->regs = devm_ioremap(dev, res->start, resource_size(res));
> + if (IS_ERR(data->regs))
> + return PTR_ERR(data->regs);
> +
> + /* get irq */
> + irq = platform_get_irq(pdev, 0);
> + if (irq < 0)
> + return irq;
> +
> + if (data->id > LOONGSON2_SOC_MAX_SENSOR_NUM - 1 || data->id < 0) {
> + dev_err(dev, "sensor id error,must be in <0 ~ %d>\n",
> + LOONGSON2_SOC_MAX_SENSOR_NUM - 1);
> + return -EINVAL;
> + }
> +
> + writeb(0xff, data->regs + LOONGSON2_TSENSOR_STATUS);
> +
> + loongson2_thermal_set(data, 0, 0, false);
> +
> + for (i = 0; i < LOONGSON2_SOC_MAX_SENSOR_NUM; i++) {
> + tzd = devm_thermal_of_zone_register(&pdev->dev, i,
> + data, &loongson2_of_thermal_ops);
> +
> + if (!IS_ERR(tzd))
> + break;
> +
> + if (PTR_ERR(tzd) != ENODEV)
> + continue;
> +
> + return dev_err_probe(&pdev->dev, PTR_ERR(tzd),
> + "failed to register");
> + }
> +
> + ret = devm_request_threaded_irq(dev, irq, NULL, loongson2_thermal_irq_thread,
> + IRQF_ONESHOT, "loongson2_thermal", tzd);
> + if (ret < 0)
> + return dev_err_probe(dev, ret, "failed to request alarm irq\n");
> +
> + if (devm_thermal_add_hwmon_sysfs(tzd))
> + dev_warn(&pdev->dev, "Failed to add hwmon sysfs attributes\n");
> +
> + return 0;
> +}
> +
> +static const struct of_device_id of_loongson2_thermal_match[] = {
> + { .compatible = "loongson,ls2k-thermal", .data = (const void *)0},
> + { /* end */ }
> +};
> +MODULE_DEVICE_TABLE(of, of_loongson2_thermal_match);
> +
> +static struct platform_driver loongson2_thermal_driver = {
> + .driver = {
> + .name = "loongson2_thermal",
> + .of_match_table = of_loongson2_thermal_match,
> + },
> + .probe = loongson2_thermal_probe,
> +};
> +module_platform_driver(loongson2_thermal_driver);
> +
> +MODULE_DESCRIPTION("Loongson2 thermal driver");
> +MODULE_LICENSE("GPL");

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