1// SPDX-License-Identifier: GPL-2.0+
  2/*
  3 * Author: zhanghongchen <zhanghongchen@loongson.cn>
  4 *         Yinbo Zhu <zhuyinbo@loongson.cn>
  5 * Copyright (C) 2022-2023 Loongson Technology Corporation Limited
  6 */
  7
  8#include <linux/interrupt.h>
  9#include <linux/io.h>
 10#include <linux/minmax.h>
 11#include <linux/mod_devicetable.h>
 12#include <linux/module.h>
 13#include <linux/platform_device.h>
 14#include <linux/property.h>
 15#include <linux/thermal.h>
 16#include <linux/units.h>
 17#include "thermal_hwmon.h"
 18
 19#define LOONGSON2_MAX_SENSOR_SEL_NUM			3
 20
 21#define LOONGSON2_THSENS_CTRL_HI_REG			0x0
 22#define LOONGSON2_THSENS_CTRL_LOW_REG			0x8
 23#define LOONGSON2_THSENS_STATUS_REG			0x10
 24#define LOONGSON2_THSENS_OUT_REG			0x14
 25
 26#define LOONGSON2_THSENS_INT_LO				BIT(0)
 27#define LOONGSON2_THSENS_INT_HIGH			BIT(1)
 28#define LOONGSON2_THSENS_OUT_MASK			0xFF
 29
 30struct loongson2_thermal_chip_data {
 31	unsigned int	thermal_sensor_sel;
 32};
 33
 34struct loongson2_thermal_data {
 35	void __iomem	*regs;
 36	const struct loongson2_thermal_chip_data *chip_data;
 37};
 38
 39static int loongson2_thermal_set(struct loongson2_thermal_data *data,
 40					int low, int high, bool enable)
 41{
 42	u64 reg_ctrl = 0;
 43	int reg_off = data->chip_data->thermal_sensor_sel * 2;
 44
 45	low = clamp(-40, low, high);
 46	high = clamp(125, low, high);
 47
 48	low += HECTO;
 49	high += HECTO;
 50
 51	reg_ctrl = low;
 52	reg_ctrl |= enable ? 0x100 : 0;
 53	writew(reg_ctrl, data->regs + LOONGSON2_THSENS_CTRL_LOW_REG + reg_off);
 54
 55	reg_ctrl = high;
 56	reg_ctrl |= enable ? 0x100 : 0;
 57	writew(reg_ctrl, data->regs + LOONGSON2_THSENS_CTRL_HI_REG + reg_off);
 58
 59	return 0;
 60}
 61
 62static int loongson2_thermal_get_temp(struct thermal_zone_device *tz, int *temp)
 63{
 64	u32 reg_val;
 65	struct loongson2_thermal_data *data = thermal_zone_device_priv(tz);
 66
 67	reg_val = readl(data->regs + LOONGSON2_THSENS_OUT_REG);
 68	*temp = ((reg_val & LOONGSON2_THSENS_OUT_MASK) - HECTO) * KILO;
 69
 70	return 0;
 71}
 72
 73static irqreturn_t loongson2_thermal_irq_thread(int irq, void *dev)
 74{
 75	struct thermal_zone_device *tzd = dev;
 76	struct loongson2_thermal_data *data = thermal_zone_device_priv(tzd);
 77
 78	writeb(LOONGSON2_THSENS_INT_LO | LOONGSON2_THSENS_INT_HIGH, data->regs +
 79		LOONGSON2_THSENS_STATUS_REG);
 80
 81	thermal_zone_device_update(tzd, THERMAL_EVENT_UNSPECIFIED);
 82
 83	return IRQ_HANDLED;
 84}
 85
 86static int loongson2_thermal_set_trips(struct thermal_zone_device *tz, int low, int high)
 87{
 88	struct loongson2_thermal_data *data = thermal_zone_device_priv(tz);
 89
 90	return loongson2_thermal_set(data, low/MILLI, high/MILLI, true);
 91}
 92
 93static const struct thermal_zone_device_ops loongson2_of_thermal_ops = {
 94	.get_temp = loongson2_thermal_get_temp,
 95	.set_trips = loongson2_thermal_set_trips,
 96};
 97
 98static int loongson2_thermal_probe(struct platform_device *pdev)
 99{
100	struct device *dev = &pdev->dev;
101	struct loongson2_thermal_data *data;
102	struct thermal_zone_device *tzd;
103	int ret, irq, i;
104
105	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
106	if (!data)
107		return -ENOMEM;
108
109	data->chip_data = device_get_match_data(dev);
110
111	data->regs = devm_platform_ioremap_resource(pdev, 0);
112	if (IS_ERR(data->regs))
113		return PTR_ERR(data->regs);
114
115	irq = platform_get_irq(pdev, 0);
116	if (irq < 0)
117		return irq;
118
119	writeb(LOONGSON2_THSENS_INT_LO | LOONGSON2_THSENS_INT_HIGH, data->regs +
120		LOONGSON2_THSENS_STATUS_REG);
121
122	loongson2_thermal_set(data, 0, 0, false);
123
124	for (i = 0; i <= LOONGSON2_MAX_SENSOR_SEL_NUM; i++) {
125		tzd = devm_thermal_of_zone_register(dev, i, data,
126			&loongson2_of_thermal_ops);
127
128		if (!IS_ERR(tzd))
129			break;
130
131		if (PTR_ERR(tzd) != -ENODEV)
132			continue;
133
134		return dev_err_probe(dev, PTR_ERR(tzd), "failed to register");
135	}
136
137	ret = devm_request_threaded_irq(dev, irq, NULL, loongson2_thermal_irq_thread,
138			IRQF_ONESHOT, "loongson2_thermal", tzd);
139	if (ret < 0)
140		return dev_err_probe(dev, ret, "failed to request alarm irq\n");
141
142	devm_thermal_add_hwmon_sysfs(dev, tzd);
143
144	return 0;
145}
146
147static const struct loongson2_thermal_chip_data loongson2_thermal_ls2k1000_data = {
148	.thermal_sensor_sel = 0,
149};
150
151static const struct of_device_id of_loongson2_thermal_match[] = {
152	{
153		.compatible = "loongson,ls2k1000-thermal",
154		.data = &loongson2_thermal_ls2k1000_data,
155	},
156	{ /* end */ }
157};
158MODULE_DEVICE_TABLE(of, of_loongson2_thermal_match);
159
160static struct platform_driver loongson2_thermal_driver = {
161	.driver = {
162		.name		= "loongson2_thermal",
163		.of_match_table = of_loongson2_thermal_match,
164	},
165	.probe	= loongson2_thermal_probe,
166};
167module_platform_driver(loongson2_thermal_driver);
168
169MODULE_DESCRIPTION("Loongson2 thermal driver");
170MODULE_LICENSE("GPL");