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