Message-Id: <20221114024709.7975-1-zhuyinbo@loongson.cn>
Date:   Mon, 14 Nov 2022 10:47:08 +0800
From:   Yinbo Zhu <zhuyinbo@...ngson.cn>
To:     "Rafael J . Wysocki" <rafael@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Amit Kucheria <amitk@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     zhanghongchen <zhanghongchen@...ngson.cn>,
        Liu Peibao <liupeibao@...ngson.cn>,
        Yinbo Zhu <zhuyinbo@...ngson.cn>
Subject: [PATCH v12 1/2] thermal: loongson-2: add thermal management support

This patch adds the support for Loongson-2 thermal sensor controller,
which can support maximum 4 sensors.

It's based on thermal of framework:
 - Trip points defined in device tree.
 - Cpufreq as cooling device registered in Loongson-2 cpufreq driver.
 - Pwm fan as cooling device registered in hwmon pwm-fan driver.

Signed-off-by: zhanghongchen <zhanghongchen@...ngson.cn>
Signed-off-by: Yinbo Zhu <zhuyinbo@...ngson.cn>
---
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             |  10 ++
 drivers/thermal/Makefile            |   1 +
 drivers/thermal/loongson2_thermal.c | 260 ++++++++++++++++++++++++++++
 4 files changed, 278 insertions(+)
 create mode 100644 drivers/thermal/loongson2_thermal.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 1b391ca7cf91..0d867573fe4c 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -12013,6 +12013,13 @@ F:	drivers/*/*loongarch*
 F:	Documentation/loongarch/
 F:	Documentation/translations/zh_CN/loongarch/
 
+LOONGSON-2 SOC SERIES THERMAL DRIVER
+M:	zhanghongchen <zhanghongchen@...ngson.cn>
+M:	Yinbo Zhu <zhuyinbo@...ngson.cn>
+L:	linux-pm@...r.kernel.org
+S:	Maintained
+F:	drivers/thermal/loongson2_thermal.c
+
 LSILOGIC MPT FUSION DRIVERS (FC/SAS/SPI)
 M:	Sathya Prakash <sathya.prakash@...adcom.com>
 M:	Sreekanth Reddy <sreekanth.reddy@...adcom.com>
diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
index e052dae614eb..93d84bcb16dd 100644
--- a/drivers/thermal/Kconfig
+++ b/drivers/thermal/Kconfig
@@ -504,4 +504,14 @@ 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 || COMPILE_TEST
+	depends on OF
+	help
+	  Support for Thermal driver found on Loongson-2 SoC series platforms.
+	  It supports one critical trip point and one passive trip point. The
+	  cpufreq and the pwm fan is used as the cooling device to throttle
+	  CPUs when the passive trip is crossed.
+
 endif
diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
index 2506c6c8ca83..02f3db809858 100644
--- a/drivers/thermal/Makefile
+++ b/drivers/thermal/Makefile
@@ -61,3 +61,4 @@ 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..2d495469e8dd
--- /dev/null
+++ b/drivers/thermal/loongson2_thermal.c
@@ -0,0 +1,260 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Author: zhanghongchen <zhanghongchen@...ngson.cn>
+ *         Yinbo Zhu <zhuyinbo@...ngson.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 {
+	struct thermal_zone_device *tzd;
+	int irq;
+	int id;
+	void __iomem *regs;
+	struct platform_device *pdev;
+	u16 ctrl_low_val;
+	u16 ctrl_hi_val;
+};
+
+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, -100);
+	high = min(high, 155);
+
+	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 = 0;
+	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 int loongson2_thermal_get_sensor_id(void)
+{
+	int ret, id;
+	struct of_phandle_args sensor_specs;
+	struct device_node *np, *sensor_np;
+
+	np = of_find_node_by_name(NULL, "thermal-zones");
+	if (!np)
+		return -ENODEV;
+
+	sensor_np = of_get_next_child(np, NULL);
+	ret = of_parse_phandle_with_args(sensor_np, "thermal-sensors",
+			"#thermal-sensor-cells",
+			0, &sensor_specs);
+	if (ret) {
+		of_node_put(np);
+		of_node_put(sensor_np);
+		return ret;
+	}
+
+	if (sensor_specs.args_count >= 1) {
+		id = sensor_specs.args[0];
+		WARN(sensor_specs.args_count > 1,
+				"%s: too many cells in sensor specifier %d\n",
+				sensor_specs.np->name, sensor_specs.args_count);
+	} else {
+		id = 0;
+	}
+
+	of_node_put(np);
+	of_node_put(sensor_np);
+
+	return id;
+}
+
+static irqreturn_t loongson2_thermal_alarm_irq(int irq, void *dev)
+{
+	struct loongson2_thermal_data *data = dev;
+
+	/* clear interrupt */
+	writeb(0x3, data->regs + LOONGSON2_TSENSOR_STATUS);
+
+	disable_irq_nosync(irq);
+
+	return IRQ_WAKE_THREAD;
+}
+
+static irqreturn_t loongson2_thermal_irq_thread(int irq, void *dev)
+{
+	struct loongson2_thermal_data *data = dev;
+
+	thermal_zone_device_update(data->tzd,
+				   THERMAL_EVENT_UNSPECIFIED);
+	enable_irq(data->irq);
+
+	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;
+	int ret;
+
+	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	data->pdev = pdev;
+	platform_set_drvdata(pdev, data);
+
+	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 */
+	data->irq = platform_get_irq(pdev, 0);
+	if (data->irq < 0)
+		return data->irq;
+
+	/* get id */
+	data->id = loongson2_thermal_get_sensor_id();
+	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);
+
+	data->tzd = devm_thermal_of_zone_register(&pdev->dev, data->id, data,
+			&loongson2_of_thermal_ops);
+	if (IS_ERR(data->tzd))
+		return dev_err_probe(&pdev->dev, PTR_ERR(data->tzd),
+				"failed to register");
+
+	ret = devm_request_threaded_irq(dev, data->irq,
+			loongson2_thermal_alarm_irq, loongson2_thermal_irq_thread,
+			IRQF_ONESHOT, "loongson2_thermal", data);
+	if (ret < 0)
+		return dev_err_probe(dev, ret, "failed to request alarm irq\n");
+
+	/*
+	 * Thermal_zone doesn't enable hwmon as default,
+	 * enable it here
+	 */
+	data->tzd->tzp->no_hwmon = false;
+	if (devm_thermal_add_hwmon_sysfs(data->tzd))
+		dev_warn(&pdev->dev, "Failed to add hwmon sysfs attributes\n");
+
+	return 0;
+}
+
+static int loongson2_thermal_remove(struct platform_device *pdev)
+{
+	struct loongson2_thermal_data *data = platform_get_drvdata(pdev);
+	int reg_off = data->id * 2;
+
+	/* disable interrupt */
+	writew(0, data->regs + LOONGSON2_TSENSOR_CTRL_LO + reg_off);
+	writew(0, data->regs + LOONGSON2_TSENSOR_CTRL_HI + reg_off);
+
+	return 0;
+}
+
+static const struct of_device_id of_loongson2_thermal_match[] = {
+	{ .compatible = "loongson,ls2k-thermal",},
+	{ /* end */ }
+};
+MODULE_DEVICE_TABLE(of, of_loongson2_thermal_match);
+
+static int __maybe_unused loongson2_thermal_suspend(struct device *dev)
+{
+	struct loongson2_thermal_data *data = dev_get_drvdata(dev);
+	int reg_off = data->id * 2;
+
+	data->ctrl_low_val = readw(data->regs + LOONGSON2_TSENSOR_CTRL_LO + reg_off);
+	data->ctrl_hi_val = readw(data->regs + LOONGSON2_TSENSOR_CTRL_HI + reg_off);
+
+	writew(0, data->regs + LOONGSON2_TSENSOR_CTRL_LO + reg_off);
+	writew(0, data->regs + LOONGSON2_TSENSOR_CTRL_HI + reg_off);
+
+	return 0;
+}
+
+static int __maybe_unused loongson2_thermal_resume(struct device *dev)
+{
+	struct loongson2_thermal_data *data = dev_get_drvdata(dev);
+	int reg_off = data->id * 2;
+
+	writew(data->ctrl_low_val, data->regs + LOONGSON2_TSENSOR_CTRL_LO + reg_off);
+	writew(data->ctrl_hi_val, data->regs + LOONGSON2_TSENSOR_CTRL_HI + reg_off);
+
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(loongson2_thermal_pm_ops,
+			 loongson2_thermal_suspend, loongson2_thermal_resume);
+
+static struct platform_driver loongson2_thermal_driver = {
+	.driver = {
+		.name		= "loongson2_thermal",
+		.pm = &loongson2_thermal_pm_ops,
+		.of_match_table = of_loongson2_thermal_match,
+	},
+	.probe	= loongson2_thermal_probe,
+	.remove	= loongson2_thermal_remove,
+};
+module_platform_driver(loongson2_thermal_driver);
+
+MODULE_DESCRIPTION("Loongson2 thermal driver");
+MODULE_LICENSE("GPL");
-- 
2.31.1

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