tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 = 0;
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 ssize_t get_hwmon_name(struct device *dev,
59 struct device_attribute *attr, char *buf);
60static SENSOR_DEVICE_ATTR(name, S_IRUGO, get_hwmon_name, NULL, 0);
61
62static struct attribute *cpu_hwmon_attributes[] = {
63 &sensor_dev_attr_name.dev_attr.attr,
64 NULL
65};
66
67/* Hwmon device attribute group */
68static struct attribute_group cpu_hwmon_attribute_group = {
69 .attrs = cpu_hwmon_attributes,
70};
71
72/* Hwmon device get name */
73static ssize_t get_hwmon_name(struct device *dev,
74 struct device_attribute *attr, char *buf)
75{
76 return sprintf(buf, "cpu-hwmon\n");
77}
78
79static ssize_t get_cpu_temp(struct device *dev,
80 struct device_attribute *attr, char *buf);
81static ssize_t cpu_temp_label(struct device *dev,
82 struct device_attribute *attr, char *buf);
83
84static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, get_cpu_temp, NULL, 1);
85static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, cpu_temp_label, NULL, 1);
86static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, get_cpu_temp, NULL, 2);
87static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, cpu_temp_label, NULL, 2);
88static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, get_cpu_temp, NULL, 3);
89static SENSOR_DEVICE_ATTR(temp3_label, S_IRUGO, cpu_temp_label, NULL, 3);
90static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, get_cpu_temp, NULL, 4);
91static SENSOR_DEVICE_ATTR(temp4_label, S_IRUGO, cpu_temp_label, NULL, 4);
92
93static const struct attribute *hwmon_cputemp[4][3] = {
94 {
95 &sensor_dev_attr_temp1_input.dev_attr.attr,
96 &sensor_dev_attr_temp1_label.dev_attr.attr,
97 NULL
98 },
99 {
100 &sensor_dev_attr_temp2_input.dev_attr.attr,
101 &sensor_dev_attr_temp2_label.dev_attr.attr,
102 NULL
103 },
104 {
105 &sensor_dev_attr_temp3_input.dev_attr.attr,
106 &sensor_dev_attr_temp3_label.dev_attr.attr,
107 NULL
108 },
109 {
110 &sensor_dev_attr_temp4_input.dev_attr.attr,
111 &sensor_dev_attr_temp4_label.dev_attr.attr,
112 NULL
113 }
114};
115
116static ssize_t cpu_temp_label(struct device *dev,
117 struct device_attribute *attr, char *buf)
118{
119 int id = (to_sensor_dev_attr(attr))->index - 1;
120 return sprintf(buf, "CPU %d Temperature\n", id);
121}
122
123static ssize_t get_cpu_temp(struct device *dev,
124 struct device_attribute *attr, char *buf)
125{
126 int id = (to_sensor_dev_attr(attr))->index - 1;
127 int value = loongson3_cpu_temp(id);
128 return sprintf(buf, "%d\n", value);
129}
130
131static int create_sysfs_cputemp_files(struct kobject *kobj)
132{
133 int i, ret = 0;
134
135 for (i=0; i<nr_packages; i++)
136 ret = sysfs_create_files(kobj, hwmon_cputemp[i]);
137
138 return ret;
139}
140
141static void remove_sysfs_cputemp_files(struct kobject *kobj)
142{
143 int i;
144
145 for (i=0; i<nr_packages; i++)
146 sysfs_remove_files(kobj, hwmon_cputemp[i]);
147}
148
149#define CPU_THERMAL_THRESHOLD 90000
150static struct delayed_work thermal_work;
151
152static void do_thermal_timer(struct work_struct *work)
153{
154 int i, value, temp_max = 0;
155
156 for (i=0; i<nr_packages; i++) {
157 value = loongson3_cpu_temp(i);
158 if (value > temp_max)
159 temp_max = value;
160 }
161
162 if (temp_max <= CPU_THERMAL_THRESHOLD)
163 schedule_delayed_work(&thermal_work, msecs_to_jiffies(5000));
164 else
165 orderly_poweroff(true);
166}
167
168static int __init loongson_hwmon_init(void)
169{
170 int ret;
171
172 pr_info("Loongson Hwmon Enter...\n");
173
174 if (cpu_has_csr())
175 csr_temp_enable = csr_readl(LOONGSON_CSR_FEATURES) & LOONGSON_CSRF_TEMP;
176
177 cpu_hwmon_dev = hwmon_device_register(NULL);
178 if (IS_ERR(cpu_hwmon_dev)) {
179 ret = PTR_ERR(cpu_hwmon_dev);
180 pr_err("hwmon_device_register fail!\n");
181 goto fail_hwmon_device_register;
182 }
183
184 nr_packages = loongson_sysconf.nr_cpus /
185 loongson_sysconf.cores_per_package;
186
187 ret = sysfs_create_group(&cpu_hwmon_dev->kobj,
188 &cpu_hwmon_attribute_group);
189 if (ret) {
190 pr_err("fail to create loongson hwmon!\n");
191 goto fail_sysfs_create_group_hwmon;
192 }
193
194 ret = create_sysfs_cputemp_files(&cpu_hwmon_dev->kobj);
195 if (ret) {
196 pr_err("fail to create cpu temperature interface!\n");
197 goto fail_create_sysfs_cputemp_files;
198 }
199
200 INIT_DEFERRABLE_WORK(&thermal_work, do_thermal_timer);
201 schedule_delayed_work(&thermal_work, msecs_to_jiffies(20000));
202
203 return ret;
204
205fail_create_sysfs_cputemp_files:
206 sysfs_remove_group(&cpu_hwmon_dev->kobj,
207 &cpu_hwmon_attribute_group);
208
209fail_sysfs_create_group_hwmon:
210 hwmon_device_unregister(cpu_hwmon_dev);
211
212fail_hwmon_device_register:
213 return ret;
214}
215
216static void __exit loongson_hwmon_exit(void)
217{
218 cancel_delayed_work_sync(&thermal_work);
219 remove_sysfs_cputemp_files(&cpu_hwmon_dev->kobj);
220 sysfs_remove_group(&cpu_hwmon_dev->kobj,
221 &cpu_hwmon_attribute_group);
222 hwmon_device_unregister(cpu_hwmon_dev);
223}
224
225module_init(loongson_hwmon_init);
226module_exit(loongson_hwmon_exit);
227
228MODULE_AUTHOR("Yu Xiang <xiangy@lemote.com>");
229MODULE_AUTHOR("Huacai Chen <chenhc@lemote.com>");
230MODULE_DESCRIPTION("Loongson CPU Hwmon driver");
231MODULE_LICENSE("GPL");