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
18 #include "thermal_hwmon.h"
19
20 #define LOONGSON2_MAX_SENSOR_SEL_NUM 3
21
22 #define LOONGSON2_THSENS_CTRL_HI_REG 0x0
23 #define LOONGSON2_THSENS_CTRL_LOW_REG 0x8
24 #define LOONGSON2_THSENS_STATUS_REG 0x10
25 #define LOONGSON2_THSENS_OUT_REG 0x14
26
27 #define LOONGSON2_THSENS_INT_LO BIT(0)
28 #define LOONGSON2_THSENS_INT_HIGH BIT(1)
29 #define LOONGSON2_THSENS_INT_EN (LOONGSON2_THSENS_INT_LO | \
30 LOONGSON2_THSENS_INT_HIGH)
31 #define LOONGSON2_THSENS_OUT_MASK 0xFF
32
33 /*
34 * This flag is used to indicate the temperature reading
35 * method of the Loongson-2K2000
36 */
37 #define LS2K2000_THSENS_OUT_FLAG BIT(0)
38
39 struct loongson2_thermal_chip_data {
40 unsigned int thermal_sensor_sel;
41 unsigned int flags;
42 };
43
44 struct loongson2_thermal_data {
45 void __iomem *ctrl_reg;
46 void __iomem *temp_reg;
47 const struct loongson2_thermal_chip_data *chip_data;
48 };
49
loongson2_set_ctrl_regs(struct loongson2_thermal_data * data,int ctrl_data,bool low,bool enable)50 static void loongson2_set_ctrl_regs(struct loongson2_thermal_data *data,
51 int ctrl_data, bool low, bool enable)
52 {
53 int reg_ctrl = 0;
54 int reg_off = data->chip_data->thermal_sensor_sel * 2;
55 int ctrl_reg = low ? LOONGSON2_THSENS_CTRL_LOW_REG : LOONGSON2_THSENS_CTRL_HI_REG;
56
57 reg_ctrl = ctrl_data + HECTO;
58 reg_ctrl |= enable ? 0x100 : 0;
59 writew(reg_ctrl, data->ctrl_reg + ctrl_reg + reg_off);
60 }
61
loongson2_thermal_set(struct loongson2_thermal_data * data,int low,int high,bool enable)62 static int loongson2_thermal_set(struct loongson2_thermal_data *data,
63 int low, int high, bool enable)
64 {
65 /* Set low temperature threshold */
66 loongson2_set_ctrl_regs(data, clamp(-40, low, high), true, enable);
67
68 /* Set high temperature threshold */
69 loongson2_set_ctrl_regs(data, clamp(125, low, high), false, enable);
70
71 return 0;
72 }
73
loongson2_2k1000_get_temp(struct thermal_zone_device * tz,int * temp)74 static int loongson2_2k1000_get_temp(struct thermal_zone_device *tz, int *temp)
75 {
76 int val;
77 struct loongson2_thermal_data *data = thermal_zone_device_priv(tz);
78
79 val = readl(data->ctrl_reg + LOONGSON2_THSENS_OUT_REG);
80 *temp = ((val & LOONGSON2_THSENS_OUT_MASK) - HECTO) * KILO;
81
82 return 0;
83 }
84
loongson2_2k2000_get_temp(struct thermal_zone_device * tz,int * temp)85 static int loongson2_2k2000_get_temp(struct thermal_zone_device *tz, int *temp)
86 {
87 int val;
88 struct loongson2_thermal_data *data = thermal_zone_device_priv(tz);
89
90 val = readl(data->temp_reg);
91 *temp = ((val & 0xffff) * 820 / 0x4000 - 311) * KILO;
92
93 return 0;
94 }
95
loongson2_thermal_irq_thread(int irq,void * dev)96 static irqreturn_t loongson2_thermal_irq_thread(int irq, void *dev)
97 {
98 struct thermal_zone_device *tzd = dev;
99 struct loongson2_thermal_data *data = thermal_zone_device_priv(tzd);
100
101 writeb(LOONGSON2_THSENS_INT_EN, data->ctrl_reg + LOONGSON2_THSENS_STATUS_REG);
102
103 thermal_zone_device_update(tzd, THERMAL_EVENT_UNSPECIFIED);
104
105 return IRQ_HANDLED;
106 }
107
loongson2_thermal_set_trips(struct thermal_zone_device * tz,int low,int high)108 static int loongson2_thermal_set_trips(struct thermal_zone_device *tz, int low, int high)
109 {
110 struct loongson2_thermal_data *data = thermal_zone_device_priv(tz);
111
112 return loongson2_thermal_set(data, low/MILLI, high/MILLI, true);
113 }
114
115 static struct thermal_zone_device_ops loongson2_of_thermal_ops = {
116 .get_temp = loongson2_2k1000_get_temp,
117 .set_trips = loongson2_thermal_set_trips,
118 };
119
loongson2_thermal_probe(struct platform_device * pdev)120 static int loongson2_thermal_probe(struct platform_device *pdev)
121 {
122 struct device *dev = &pdev->dev;
123 struct loongson2_thermal_data *data;
124 struct thermal_zone_device *tzd;
125 int ret, irq, i;
126
127 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
128 if (!data)
129 return -ENOMEM;
130
131 data->chip_data = device_get_match_data(dev);
132
133 data->ctrl_reg = devm_platform_ioremap_resource(pdev, 0);
134 if (IS_ERR(data->ctrl_reg))
135 return PTR_ERR(data->ctrl_reg);
136
137 /* The temperature output register is separate for Loongson-2K2000 */
138 if (data->chip_data->flags & LS2K2000_THSENS_OUT_FLAG) {
139 data->temp_reg = devm_platform_ioremap_resource(pdev, 1);
140 if (IS_ERR(data->temp_reg))
141 return PTR_ERR(data->temp_reg);
142
143 loongson2_of_thermal_ops.get_temp = loongson2_2k2000_get_temp;
144 }
145
146 irq = platform_get_irq(pdev, 0);
147 if (irq < 0)
148 return irq;
149
150 writeb(LOONGSON2_THSENS_INT_EN, data->ctrl_reg + LOONGSON2_THSENS_STATUS_REG);
151
152 loongson2_thermal_set(data, 0, 0, false);
153
154 for (i = 0; i <= LOONGSON2_MAX_SENSOR_SEL_NUM; i++) {
155 tzd = devm_thermal_of_zone_register(dev, i, data,
156 &loongson2_of_thermal_ops);
157
158 if (!IS_ERR(tzd))
159 break;
160
161 if (PTR_ERR(tzd) != -ENODEV)
162 continue;
163
164 return dev_err_probe(dev, PTR_ERR(tzd), "failed to register");
165 }
166
167 ret = devm_request_threaded_irq(dev, irq, NULL, loongson2_thermal_irq_thread,
168 IRQF_ONESHOT, "loongson2_thermal", tzd);
169 if (ret < 0)
170 return dev_err_probe(dev, ret, "failed to request alarm irq\n");
171
172 devm_thermal_add_hwmon_sysfs(dev, tzd);
173
174 return 0;
175 }
176
177 static const struct loongson2_thermal_chip_data loongson2_thermal_ls2k1000_data = {
178 .thermal_sensor_sel = 0,
179 .flags = 0,
180 };
181
182 static const struct loongson2_thermal_chip_data loongson2_thermal_ls2k2000_data = {
183 .thermal_sensor_sel = 0,
184 .flags = LS2K2000_THSENS_OUT_FLAG,
185 };
186
187 static const struct of_device_id of_loongson2_thermal_match[] = {
188 {
189 .compatible = "loongson,ls2k1000-thermal",
190 .data = &loongson2_thermal_ls2k1000_data,
191 },
192 {
193 .compatible = "loongson,ls2k2000-thermal",
194 .data = &loongson2_thermal_ls2k2000_data,
195 },
196 { /* end */ }
197 };
198 MODULE_DEVICE_TABLE(of, of_loongson2_thermal_match);
199
200 static struct platform_driver loongson2_thermal_driver = {
201 .driver = {
202 .name = "loongson2_thermal",
203 .of_match_table = of_loongson2_thermal_match,
204 },
205 .probe = loongson2_thermal_probe,
206 };
207 module_platform_driver(loongson2_thermal_driver);
208
209 MODULE_DESCRIPTION("Loongson2 thermal driver");
210 MODULE_AUTHOR("Loongson Technology Corporation Limited");
211 MODULE_LICENSE("GPL");
212