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 | |
14 | static 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 | */ |
22 | int 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 | |
51 | out: |
52 | return (int)reg * 1000; |
53 | } |
54 | |
55 | static int nr_packages; |
56 | static struct device *cpu_hwmon_dev; |
57 | |
58 | static ssize_t cpu_temp_label(struct device *dev, |
59 | struct device_attribute *attr, char *buf) |
60 | { |
61 | int id = (to_sensor_dev_attr(attr))->index - 1; |
62 | |
63 | return sprintf(buf, fmt: "CPU %d Temperature\n" , id); |
64 | } |
65 | |
66 | static ssize_t get_cpu_temp(struct device *dev, |
67 | struct device_attribute *attr, char *buf) |
68 | { |
69 | int id = (to_sensor_dev_attr(attr))->index - 1; |
70 | int value = loongson3_cpu_temp(cpu: id); |
71 | |
72 | return sprintf(buf, fmt: "%d\n" , value); |
73 | } |
74 | |
75 | static SENSOR_DEVICE_ATTR(temp1_input, 0444, get_cpu_temp, NULL, 1); |
76 | static SENSOR_DEVICE_ATTR(temp1_label, 0444, cpu_temp_label, NULL, 1); |
77 | static SENSOR_DEVICE_ATTR(temp2_input, 0444, get_cpu_temp, NULL, 2); |
78 | static SENSOR_DEVICE_ATTR(temp2_label, 0444, cpu_temp_label, NULL, 2); |
79 | static SENSOR_DEVICE_ATTR(temp3_input, 0444, get_cpu_temp, NULL, 3); |
80 | static SENSOR_DEVICE_ATTR(temp3_label, 0444, cpu_temp_label, NULL, 3); |
81 | static SENSOR_DEVICE_ATTR(temp4_input, 0444, get_cpu_temp, NULL, 4); |
82 | static SENSOR_DEVICE_ATTR(temp4_label, 0444, cpu_temp_label, NULL, 4); |
83 | |
84 | static struct attribute *cpu_hwmon_attributes[] = { |
85 | &sensor_dev_attr_temp1_input.dev_attr.attr, |
86 | &sensor_dev_attr_temp1_label.dev_attr.attr, |
87 | &sensor_dev_attr_temp2_input.dev_attr.attr, |
88 | &sensor_dev_attr_temp2_label.dev_attr.attr, |
89 | &sensor_dev_attr_temp3_input.dev_attr.attr, |
90 | &sensor_dev_attr_temp3_label.dev_attr.attr, |
91 | &sensor_dev_attr_temp4_input.dev_attr.attr, |
92 | &sensor_dev_attr_temp4_label.dev_attr.attr, |
93 | NULL |
94 | }; |
95 | |
96 | static umode_t cpu_hwmon_is_visible(struct kobject *kobj, |
97 | struct attribute *attr, int i) |
98 | { |
99 | int id = i / 2; |
100 | |
101 | if (id < nr_packages) |
102 | return attr->mode; |
103 | return 0; |
104 | } |
105 | |
106 | static struct attribute_group cpu_hwmon_group = { |
107 | .attrs = cpu_hwmon_attributes, |
108 | .is_visible = cpu_hwmon_is_visible, |
109 | }; |
110 | |
111 | static const struct attribute_group *cpu_hwmon_groups[] = { |
112 | &cpu_hwmon_group, |
113 | NULL |
114 | }; |
115 | |
116 | #define CPU_THERMAL_THRESHOLD 90000 |
117 | static struct delayed_work thermal_work; |
118 | |
119 | static void do_thermal_timer(struct work_struct *work) |
120 | { |
121 | int i, value; |
122 | |
123 | for (i = 0; i < nr_packages; i++) { |
124 | value = loongson3_cpu_temp(cpu: i); |
125 | if (value > CPU_THERMAL_THRESHOLD) { |
126 | pr_emerg("Power off due to high temp: %d\n" , value); |
127 | orderly_poweroff(force: true); |
128 | } |
129 | } |
130 | |
131 | schedule_delayed_work(dwork: &thermal_work, delay: msecs_to_jiffies(m: 5000)); |
132 | } |
133 | |
134 | static int __init loongson_hwmon_init(void) |
135 | { |
136 | pr_info("Loongson Hwmon Enter...\n" ); |
137 | |
138 | if (cpu_has_csr()) |
139 | csr_temp_enable = csr_readl(LOONGSON_CSR_FEATURES) & |
140 | LOONGSON_CSRF_TEMP; |
141 | |
142 | nr_packages = loongson_sysconf.nr_cpus / |
143 | loongson_sysconf.cores_per_package; |
144 | |
145 | cpu_hwmon_dev = hwmon_device_register_with_groups(NULL, name: "cpu_hwmon" , |
146 | NULL, groups: cpu_hwmon_groups); |
147 | if (IS_ERR(ptr: cpu_hwmon_dev)) { |
148 | pr_err("hwmon_device_register fail!\n" ); |
149 | return PTR_ERR(ptr: cpu_hwmon_dev); |
150 | } |
151 | |
152 | INIT_DEFERRABLE_WORK(&thermal_work, do_thermal_timer); |
153 | schedule_delayed_work(dwork: &thermal_work, delay: msecs_to_jiffies(m: 20000)); |
154 | |
155 | return 0; |
156 | } |
157 | |
158 | static void __exit loongson_hwmon_exit(void) |
159 | { |
160 | cancel_delayed_work_sync(dwork: &thermal_work); |
161 | hwmon_device_unregister(dev: cpu_hwmon_dev); |
162 | } |
163 | |
164 | module_init(loongson_hwmon_init); |
165 | module_exit(loongson_hwmon_exit); |
166 | |
167 | MODULE_AUTHOR("Yu Xiang <xiangy@lemote.com>" ); |
168 | MODULE_AUTHOR("Huacai Chen <chenhc@lemote.com>" ); |
169 | MODULE_DESCRIPTION("Loongson CPU Hwmon driver" ); |
170 | MODULE_LICENSE("GPL" ); |
171 | |