Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 169 insertions, 0 deletions

diff --git a/drivers/thermal/loongson2_thermal.c b/drivers/thermal/loongson2_thermal.c
new file mode 100644
index 0000000000..99ca0c7bc4
--- /dev/null
+++ b/drivers/thermal/loongson2_thermal.c
@@ -0,0 +1,169 @@
+// 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/interrupt.h>
+#include <linux/io.h>
+#include <linux/minmax.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/thermal.h>
+#include <linux/units.h>
+#include "thermal_hwmon.h"
+
+#define LOONGSON2_MAX_SENSOR_SEL_NUM			3
+
+#define LOONGSON2_THSENS_CTRL_HI_REG			0x0
+#define LOONGSON2_THSENS_CTRL_LOW_REG			0x8
+#define LOONGSON2_THSENS_STATUS_REG			0x10
+#define LOONGSON2_THSENS_OUT_REG			0x14
+
+#define LOONGSON2_THSENS_INT_LO				BIT(0)
+#define LOONGSON2_THSENS_INT_HIGH			BIT(1)
+#define LOONGSON2_THSENS_OUT_MASK			0xFF
+
+struct loongson2_thermal_chip_data {
+	unsigned int	thermal_sensor_sel;
+};
+
+struct loongson2_thermal_data {
+	void __iomem	*regs;
+	const struct loongson2_thermal_chip_data *chip_data;
+};
+
+static int loongson2_thermal_set(struct loongson2_thermal_data *data,
+					int low, int high, bool enable)
+{
+	u64 reg_ctrl = 0;
+	int reg_off = data->chip_data->thermal_sensor_sel * 2;
+
+	low = clamp(-40, low, high);
+	high = clamp(125, low, high);
+
+	low += HECTO;
+	high += HECTO;
+
+	reg_ctrl = low;
+	reg_ctrl |= enable ? 0x100 : 0;
+	writew(reg_ctrl, data->regs + LOONGSON2_THSENS_CTRL_LOW_REG + reg_off);
+
+	reg_ctrl = high;
+	reg_ctrl |= enable ? 0x100 : 0;
+	writew(reg_ctrl, data->regs + LOONGSON2_THSENS_CTRL_HI_REG + 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 = thermal_zone_device_priv(tz);
+
+	reg_val = readl(data->regs + LOONGSON2_THSENS_OUT_REG);
+	*temp = ((reg_val & LOONGSON2_THSENS_OUT_MASK) - HECTO) * KILO;
+
+	return 0;
+}
+
+static irqreturn_t loongson2_thermal_irq_thread(int irq, void *dev)
+{
+	struct thermal_zone_device *tzd = dev;
+	struct loongson2_thermal_data *data = thermal_zone_device_priv(tzd);
+
+	writeb(LOONGSON2_THSENS_INT_LO | LOONGSON2_THSENS_INT_HIGH, data->regs +
+		LOONGSON2_THSENS_STATUS_REG);
+
+	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 = thermal_zone_device_priv(tz);
+
+	return loongson2_thermal_set(data, low/MILLI, high/MILLI, 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 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->chip_data = device_get_match_data(dev);
+
+	data->regs = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(data->regs))
+		return PTR_ERR(data->regs);
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return irq;
+
+	writeb(LOONGSON2_THSENS_INT_LO | LOONGSON2_THSENS_INT_HIGH, data->regs +
+		LOONGSON2_THSENS_STATUS_REG);
+
+	loongson2_thermal_set(data, 0, 0, false);
+
+	for (i = 0; i <= LOONGSON2_MAX_SENSOR_SEL_NUM; i++) {
+		tzd = devm_thermal_of_zone_register(dev, i, data,
+			&loongson2_of_thermal_ops);
+
+		if (!IS_ERR(tzd))
+			break;
+
+		if (PTR_ERR(tzd) != -ENODEV)
+			continue;
+
+		return dev_err_probe(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");
+
+	devm_thermal_add_hwmon_sysfs(dev, tzd);
+
+	return 0;
+}
+
+static const struct loongson2_thermal_chip_data loongson2_thermal_ls2k1000_data = {
+	.thermal_sensor_sel = 0,
+};
+
+static const struct of_device_id of_loongson2_thermal_match[] = {
+	{
+		.compatible = "loongson,ls2k1000-thermal",
+		.data = &loongson2_thermal_ls2k1000_data,
+	},
+	{ /* 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");