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1// SPDX-License-Identifier: GPL-2.0-only
2#include <linux/err.h>
3#include <linux/module.h>
4#include <linux/reboot.h>
5#include <linux/jiffies.h>
6#include <linux/hwmon.h>
7#include <linux/hwmon-sysfs.h>
8
9#include <loongson.h>
10#include <boot_param.h>
11#include <loongson_hwmon.h>
12#include <loongson_regs.h>
13
14static int csr_temp_enable;
15
16/*
17 * Loongson-3 series cpu has two sensors inside,
18 * each of them from 0 to 255,
19 * if more than 127, that is dangerous.
20 * here only provide sensor1 data, because it always hot than sensor0
21 */
22int loongson3_cpu_temp(int cpu)
23{
24 u32 reg, prid_rev;
25
26 if (csr_temp_enable) {
27 reg = (csr_readl(LOONGSON_CSR_CPUTEMP) & 0xff);
28 goto out;
29 }
30
31 reg = LOONGSON_CHIPTEMP(cpu);
32 prid_rev = read_c0_prid() & PRID_REV_MASK;
33
34 switch (prid_rev) {
35 case PRID_REV_LOONGSON3A_R1:
36 reg = (reg >> 8) & 0xff;
37 break;
38 case PRID_REV_LOONGSON3B_R1:
39 case PRID_REV_LOONGSON3B_R2:
40 case PRID_REV_LOONGSON3A_R2_0:
41 case PRID_REV_LOONGSON3A_R2_1:
42 reg = ((reg >> 8) & 0xff) - 100;
43 break;
44 case PRID_REV_LOONGSON3A_R3_0:
45 case PRID_REV_LOONGSON3A_R3_1:
46 default:
47 reg = (reg & 0xffff) * 731 / 0x4000 - 273;
48 break;
49 }
50
51out:
52 return (int)reg * 1000;
53}
54
55static int nr_packages;
56static struct device *cpu_hwmon_dev;
57
58static SENSOR_DEVICE_ATTR(name, 0444, NULL, NULL, 0);
59
60static struct attribute *cpu_hwmon_attributes[] = {
61 &sensor_dev_attr_name.dev_attr.attr,
62 NULL
63};
64
65/* Hwmon device attribute group */
66static struct attribute_group cpu_hwmon_attribute_group = {
67 .attrs = cpu_hwmon_attributes,
68};
69
70static ssize_t get_cpu_temp(struct device *dev,
71 struct device_attribute *attr, char *buf);
72static ssize_t cpu_temp_label(struct device *dev,
73 struct device_attribute *attr, char *buf);
74
75static SENSOR_DEVICE_ATTR(temp1_input, 0444, get_cpu_temp, NULL, 1);
76static SENSOR_DEVICE_ATTR(temp1_label, 0444, cpu_temp_label, NULL, 1);
77static SENSOR_DEVICE_ATTR(temp2_input, 0444, get_cpu_temp, NULL, 2);
78static SENSOR_DEVICE_ATTR(temp2_label, 0444, cpu_temp_label, NULL, 2);
79static SENSOR_DEVICE_ATTR(temp3_input, 0444, get_cpu_temp, NULL, 3);
80static SENSOR_DEVICE_ATTR(temp3_label, 0444, cpu_temp_label, NULL, 3);
81static SENSOR_DEVICE_ATTR(temp4_input, 0444, get_cpu_temp, NULL, 4);
82static SENSOR_DEVICE_ATTR(temp4_label, 0444, cpu_temp_label, NULL, 4);
83
84static const struct attribute *hwmon_cputemp[4][3] = {
85 {
86 &sensor_dev_attr_temp1_input.dev_attr.attr,
87 &sensor_dev_attr_temp1_label.dev_attr.attr,
88 NULL
89 },
90 {
91 &sensor_dev_attr_temp2_input.dev_attr.attr,
92 &sensor_dev_attr_temp2_label.dev_attr.attr,
93 NULL
94 },
95 {
96 &sensor_dev_attr_temp3_input.dev_attr.attr,
97 &sensor_dev_attr_temp3_label.dev_attr.attr,
98 NULL
99 },
100 {
101 &sensor_dev_attr_temp4_input.dev_attr.attr,
102 &sensor_dev_attr_temp4_label.dev_attr.attr,
103 NULL
104 }
105};
106
107static ssize_t cpu_temp_label(struct device *dev,
108 struct device_attribute *attr, char *buf)
109{
110 int id = (to_sensor_dev_attr(attr))->index - 1;
111
112 return sprintf(buf, "CPU %d Temperature\n", id);
113}
114
115static ssize_t get_cpu_temp(struct device *dev,
116 struct device_attribute *attr, char *buf)
117{
118 int id = (to_sensor_dev_attr(attr))->index - 1;
119 int value = loongson3_cpu_temp(id);
120
121 return sprintf(buf, "%d\n", value);
122}
123
124static int create_sysfs_cputemp_files(struct kobject *kobj)
125{
126 int i, ret = 0;
127
128 for (i = 0; i < nr_packages; i++)
129 ret = sysfs_create_files(kobj, hwmon_cputemp[i]);
130
131 return ret;
132}
133
134static void remove_sysfs_cputemp_files(struct kobject *kobj)
135{
136 int i;
137
138 for (i = 0; i < nr_packages; i++)
139 sysfs_remove_files(kobj, hwmon_cputemp[i]);
140}
141
142#define CPU_THERMAL_THRESHOLD 90000
143static struct delayed_work thermal_work;
144
145static void do_thermal_timer(struct work_struct *work)
146{
147 int i, value;
148
149 for (i = 0; i < nr_packages; i++) {
150 value = loongson3_cpu_temp(i);
151 if (value > CPU_THERMAL_THRESHOLD) {
152 pr_emerg("Power off due to high temp: %d\n", value);
153 orderly_poweroff(true);
154 }
155 }
156
157 schedule_delayed_work(&thermal_work, msecs_to_jiffies(5000));
158}
159
160static int __init loongson_hwmon_init(void)
161{
162 int ret;
163
164 pr_info("Loongson Hwmon Enter...\n");
165
166 if (cpu_has_csr())
167 csr_temp_enable = csr_readl(LOONGSON_CSR_FEATURES) &
168 LOONGSON_CSRF_TEMP;
169
170 cpu_hwmon_dev = hwmon_device_register_with_info(NULL, "cpu_hwmon", NULL, NULL, NULL);
171 if (IS_ERR(cpu_hwmon_dev)) {
172 ret = PTR_ERR(cpu_hwmon_dev);
173 pr_err("hwmon_device_register fail!\n");
174 goto fail_hwmon_device_register;
175 }
176
177 nr_packages = loongson_sysconf.nr_cpus /
178 loongson_sysconf.cores_per_package;
179
180 ret = create_sysfs_cputemp_files(&cpu_hwmon_dev->kobj);
181 if (ret) {
182 pr_err("fail to create cpu temperature interface!\n");
183 goto fail_create_sysfs_cputemp_files;
184 }
185
186 INIT_DEFERRABLE_WORK(&thermal_work, do_thermal_timer);
187 schedule_delayed_work(&thermal_work, msecs_to_jiffies(20000));
188
189 return ret;
190
191fail_create_sysfs_cputemp_files:
192 sysfs_remove_group(&cpu_hwmon_dev->kobj,
193 &cpu_hwmon_attribute_group);
194 hwmon_device_unregister(cpu_hwmon_dev);
195
196fail_hwmon_device_register:
197 return ret;
198}
199
200static void __exit loongson_hwmon_exit(void)
201{
202 cancel_delayed_work_sync(&thermal_work);
203 remove_sysfs_cputemp_files(&cpu_hwmon_dev->kobj);
204 sysfs_remove_group(&cpu_hwmon_dev->kobj,
205 &cpu_hwmon_attribute_group);
206 hwmon_device_unregister(cpu_hwmon_dev);
207}
208
209module_init(loongson_hwmon_init);
210module_exit(loongson_hwmon_exit);
211
212MODULE_AUTHOR("Yu Xiang <xiangy@lemote.com>");
213MODULE_AUTHOR("Huacai Chen <chenhc@lemote.com>");
214MODULE_DESCRIPTION("Loongson CPU Hwmon driver");
215MODULE_LICENSE("GPL");
1#include <linux/err.h>
2#include <linux/module.h>
3#include <linux/reboot.h>
4#include <linux/jiffies.h>
5#include <linux/hwmon.h>
6#include <linux/hwmon-sysfs.h>
7
8#include <loongson.h>
9#include <boot_param.h>
10#include <loongson_hwmon.h>
11
12/*
13 * Loongson-3 series cpu has two sensors inside,
14 * each of them from 0 to 255,
15 * if more than 127, that is dangerous.
16 * here only provide sensor1 data, because it always hot than sensor0
17 */
18int loongson3_cpu_temp(int cpu)
19{
20 u32 reg;
21
22 reg = LOONGSON_CHIPTEMP(cpu);
23 if (loongson_sysconf.cputype == Loongson_3A)
24 reg = (reg >> 8) & 0xff;
25 else if (loongson_sysconf.cputype == Loongson_3B)
26 reg = ((reg >> 8) & 0xff) - 100;
27
28 return (int)reg * 1000;
29}
30
31static struct device *cpu_hwmon_dev;
32
33static ssize_t get_hwmon_name(struct device *dev,
34 struct device_attribute *attr, char *buf);
35static SENSOR_DEVICE_ATTR(name, S_IRUGO, get_hwmon_name, NULL, 0);
36
37static struct attribute *cpu_hwmon_attributes[] = {
38 &sensor_dev_attr_name.dev_attr.attr,
39 NULL
40};
41
42/* Hwmon device attribute group */
43static struct attribute_group cpu_hwmon_attribute_group = {
44 .attrs = cpu_hwmon_attributes,
45};
46
47/* Hwmon device get name */
48static ssize_t get_hwmon_name(struct device *dev,
49 struct device_attribute *attr, char *buf)
50{
51 return sprintf(buf, "cpu-hwmon\n");
52}
53
54static ssize_t get_cpu0_temp(struct device *dev,
55 struct device_attribute *attr, char *buf);
56static ssize_t get_cpu1_temp(struct device *dev,
57 struct device_attribute *attr, char *buf);
58static ssize_t cpu0_temp_label(struct device *dev,
59 struct device_attribute *attr, char *buf);
60static ssize_t cpu1_temp_label(struct device *dev,
61 struct device_attribute *attr, char *buf);
62
63static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, get_cpu0_temp, NULL, 1);
64static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, cpu0_temp_label, NULL, 1);
65static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, get_cpu1_temp, NULL, 2);
66static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, cpu1_temp_label, NULL, 2);
67
68static const struct attribute *hwmon_cputemp1[] = {
69 &sensor_dev_attr_temp1_input.dev_attr.attr,
70 &sensor_dev_attr_temp1_label.dev_attr.attr,
71 NULL
72};
73
74static const struct attribute *hwmon_cputemp2[] = {
75 &sensor_dev_attr_temp2_input.dev_attr.attr,
76 &sensor_dev_attr_temp2_label.dev_attr.attr,
77 NULL
78};
79
80static ssize_t cpu0_temp_label(struct device *dev,
81 struct device_attribute *attr, char *buf)
82{
83 return sprintf(buf, "CPU 0 Temprature\n");
84}
85
86static ssize_t cpu1_temp_label(struct device *dev,
87 struct device_attribute *attr, char *buf)
88{
89 return sprintf(buf, "CPU 1 Temprature\n");
90}
91
92static ssize_t get_cpu0_temp(struct device *dev,
93 struct device_attribute *attr, char *buf)
94{
95 int value = loongson3_cpu_temp(0);
96 return sprintf(buf, "%d\n", value);
97}
98
99static ssize_t get_cpu1_temp(struct device *dev,
100 struct device_attribute *attr, char *buf)
101{
102 int value = loongson3_cpu_temp(1);
103 return sprintf(buf, "%d\n", value);
104}
105
106static int create_sysfs_cputemp_files(struct kobject *kobj)
107{
108 int ret;
109
110 ret = sysfs_create_files(kobj, hwmon_cputemp1);
111 if (ret)
112 goto sysfs_create_temp1_fail;
113
114 if (loongson_sysconf.nr_cpus <= loongson_sysconf.cores_per_package)
115 return 0;
116
117 ret = sysfs_create_files(kobj, hwmon_cputemp2);
118 if (ret)
119 goto sysfs_create_temp2_fail;
120
121 return 0;
122
123sysfs_create_temp2_fail:
124 sysfs_remove_files(kobj, hwmon_cputemp1);
125
126sysfs_create_temp1_fail:
127 return -1;
128}
129
130static void remove_sysfs_cputemp_files(struct kobject *kobj)
131{
132 sysfs_remove_files(&cpu_hwmon_dev->kobj, hwmon_cputemp1);
133
134 if (loongson_sysconf.nr_cpus > loongson_sysconf.cores_per_package)
135 sysfs_remove_files(&cpu_hwmon_dev->kobj, hwmon_cputemp2);
136}
137
138#define CPU_THERMAL_THRESHOLD 90000
139static struct delayed_work thermal_work;
140
141static void do_thermal_timer(struct work_struct *work)
142{
143 int value = loongson3_cpu_temp(0);
144 if (value <= CPU_THERMAL_THRESHOLD)
145 schedule_delayed_work(&thermal_work, msecs_to_jiffies(5000));
146 else
147 orderly_poweroff(true);
148}
149
150static int __init loongson_hwmon_init(void)
151{
152 int ret;
153
154 pr_info("Loongson Hwmon Enter...\n");
155
156 cpu_hwmon_dev = hwmon_device_register(NULL);
157 if (IS_ERR(cpu_hwmon_dev)) {
158 ret = -ENOMEM;
159 pr_err("hwmon_device_register fail!\n");
160 goto fail_hwmon_device_register;
161 }
162
163 ret = sysfs_create_group(&cpu_hwmon_dev->kobj,
164 &cpu_hwmon_attribute_group);
165 if (ret) {
166 pr_err("fail to create loongson hwmon!\n");
167 goto fail_sysfs_create_group_hwmon;
168 }
169
170 ret = create_sysfs_cputemp_files(&cpu_hwmon_dev->kobj);
171 if (ret) {
172 pr_err("fail to create cpu temprature interface!\n");
173 goto fail_create_sysfs_cputemp_files;
174 }
175
176 INIT_DEFERRABLE_WORK(&thermal_work, do_thermal_timer);
177 schedule_delayed_work(&thermal_work, msecs_to_jiffies(20000));
178
179 return ret;
180
181fail_create_sysfs_cputemp_files:
182 sysfs_remove_group(&cpu_hwmon_dev->kobj,
183 &cpu_hwmon_attribute_group);
184
185fail_sysfs_create_group_hwmon:
186 hwmon_device_unregister(cpu_hwmon_dev);
187
188fail_hwmon_device_register:
189 return ret;
190}
191
192static void __exit loongson_hwmon_exit(void)
193{
194 cancel_delayed_work_sync(&thermal_work);
195 remove_sysfs_cputemp_files(&cpu_hwmon_dev->kobj);
196 sysfs_remove_group(&cpu_hwmon_dev->kobj,
197 &cpu_hwmon_attribute_group);
198 hwmon_device_unregister(cpu_hwmon_dev);
199}
200
201module_init(loongson_hwmon_init);
202module_exit(loongson_hwmon_exit);
203
204MODULE_AUTHOR("Yu Xiang <xiangy@lemote.com>");
205MODULE_AUTHOR("Huacai Chen <chenhc@lemote.com>");
206MODULE_DESCRIPTION("Loongson CPU Hwmon driver");
207MODULE_LICENSE("GPL");