summaryrefslogtreecommitdiffstats
path: root/drivers/platform/mips/cpu_hwmon.c
blob: 1833b51690e54c4af9a440710aac1cd6cd7c118e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
// SPDX-License-Identifier: GPL-2.0-only
#include <linux/err.h>
#include <linux/module.h>
#include <linux/reboot.h>
#include <linux/jiffies.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>

#include <loongson.h>
#include <boot_param.h>
#include <loongson_hwmon.h>
#include <loongson_regs.h>

static int csr_temp_enable = 0;

/*
 * Loongson-3 series cpu has two sensors inside,
 * each of them from 0 to 255,
 * if more than 127, that is dangerous.
 * here only provide sensor1 data, because it always hot than sensor0
 */
int loongson3_cpu_temp(int cpu)
{
	u32 reg, prid_rev;

	if (csr_temp_enable) {
		reg = (csr_readl(LOONGSON_CSR_CPUTEMP) & 0xff);
		goto out;
	}

	reg = LOONGSON_CHIPTEMP(cpu);
	prid_rev = read_c0_prid() & PRID_REV_MASK;

	switch (prid_rev) {
	case PRID_REV_LOONGSON3A_R1:
		reg = (reg >> 8) & 0xff;
		break;
	case PRID_REV_LOONGSON3B_R1:
	case PRID_REV_LOONGSON3B_R2:
	case PRID_REV_LOONGSON3A_R2_0:
	case PRID_REV_LOONGSON3A_R2_1:
		reg = ((reg >> 8) & 0xff) - 100;
		break;
	case PRID_REV_LOONGSON3A_R3_0:
	case PRID_REV_LOONGSON3A_R3_1:
	default:
		reg = (reg & 0xffff)*731/0x4000 - 273;
		break;
	}

out:
	return (int)reg * 1000;
}

static int nr_packages;
static struct device *cpu_hwmon_dev;

static ssize_t get_hwmon_name(struct device *dev,
			struct device_attribute *attr, char *buf);
static SENSOR_DEVICE_ATTR(name, S_IRUGO, get_hwmon_name, NULL, 0);

static struct attribute *cpu_hwmon_attributes[] = {
	&sensor_dev_attr_name.dev_attr.attr,
	NULL
};

/* Hwmon device attribute group */
static struct attribute_group cpu_hwmon_attribute_group = {
	.attrs = cpu_hwmon_attributes,
};

/* Hwmon device get name */
static ssize_t get_hwmon_name(struct device *dev,
			struct device_attribute *attr, char *buf)
{
	return sprintf(buf, "cpu-hwmon\n");
}

static ssize_t get_cpu_temp(struct device *dev,
			struct device_attribute *attr, char *buf);
static ssize_t cpu_temp_label(struct device *dev,
			struct device_attribute *attr, char *buf);

static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, get_cpu_temp, NULL, 1);
static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, cpu_temp_label, NULL, 1);
static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, get_cpu_temp, NULL, 2);
static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, cpu_temp_label, NULL, 2);
static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, get_cpu_temp, NULL, 3);
static SENSOR_DEVICE_ATTR(temp3_label, S_IRUGO, cpu_temp_label, NULL, 3);
static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, get_cpu_temp, NULL, 4);
static SENSOR_DEVICE_ATTR(temp4_label, S_IRUGO, cpu_temp_label, NULL, 4);

static const struct attribute *hwmon_cputemp[4][3] = {
	{
		&sensor_dev_attr_temp1_input.dev_attr.attr,
		&sensor_dev_attr_temp1_label.dev_attr.attr,
		NULL
	},
	{
		&sensor_dev_attr_temp2_input.dev_attr.attr,
		&sensor_dev_attr_temp2_label.dev_attr.attr,
		NULL
	},
	{
		&sensor_dev_attr_temp3_input.dev_attr.attr,
		&sensor_dev_attr_temp3_label.dev_attr.attr,
		NULL
	},
	{
		&sensor_dev_attr_temp4_input.dev_attr.attr,
		&sensor_dev_attr_temp4_label.dev_attr.attr,
		NULL
	}
};

static ssize_t cpu_temp_label(struct device *dev,
			struct device_attribute *attr, char *buf)
{
	int id = (to_sensor_dev_attr(attr))->index - 1;
	return sprintf(buf, "CPU %d Temperature\n", id);
}

static ssize_t get_cpu_temp(struct device *dev,
			struct device_attribute *attr, char *buf)
{
	int id = (to_sensor_dev_attr(attr))->index - 1;
	int value = loongson3_cpu_temp(id);
	return sprintf(buf, "%d\n", value);
}

static int create_sysfs_cputemp_files(struct kobject *kobj)
{
	int i, ret = 0;

	for (i=0; i<nr_packages; i++)
		ret = sysfs_create_files(kobj, hwmon_cputemp[i]);

	return ret;
}

static void remove_sysfs_cputemp_files(struct kobject *kobj)
{
	int i;

	for (i=0; i<nr_packages; i++)
		sysfs_remove_files(kobj, hwmon_cputemp[i]);
}

#define CPU_THERMAL_THRESHOLD 90000
static struct delayed_work thermal_work;

static void do_thermal_timer(struct work_struct *work)
{
	int i, value, temp_max = 0;

	for (i=0; i<nr_packages; i++) {
		value = loongson3_cpu_temp(i);
		if (value > temp_max)
			temp_max = value;
	}

	if (temp_max <= CPU_THERMAL_THRESHOLD)
		schedule_delayed_work(&thermal_work, msecs_to_jiffies(5000));
	else
		orderly_poweroff(true);
}

static int __init loongson_hwmon_init(void)
{
	int ret;

	pr_info("Loongson Hwmon Enter...\n");

	if (cpu_has_csr())
		csr_temp_enable = csr_readl(LOONGSON_CSR_FEATURES) & LOONGSON_CSRF_TEMP;

	cpu_hwmon_dev = hwmon_device_register(NULL);
	if (IS_ERR(cpu_hwmon_dev)) {
		ret = -ENOMEM;
		pr_err("hwmon_device_register fail!\n");
		goto fail_hwmon_device_register;
	}

	nr_packages = loongson_sysconf.nr_cpus /
		loongson_sysconf.cores_per_package;

	ret = sysfs_create_group(&cpu_hwmon_dev->kobj,
				&cpu_hwmon_attribute_group);
	if (ret) {
		pr_err("fail to create loongson hwmon!\n");
		goto fail_sysfs_create_group_hwmon;
	}

	ret = create_sysfs_cputemp_files(&cpu_hwmon_dev->kobj);
	if (ret) {
		pr_err("fail to create cpu temperature interface!\n");
		goto fail_create_sysfs_cputemp_files;
	}

	INIT_DEFERRABLE_WORK(&thermal_work, do_thermal_timer);
	schedule_delayed_work(&thermal_work, msecs_to_jiffies(20000));

	return ret;

fail_create_sysfs_cputemp_files:
	sysfs_remove_group(&cpu_hwmon_dev->kobj,
				&cpu_hwmon_attribute_group);

fail_sysfs_create_group_hwmon:
	hwmon_device_unregister(cpu_hwmon_dev);

fail_hwmon_device_register:
	return ret;
}

static void __exit loongson_hwmon_exit(void)
{
	cancel_delayed_work_sync(&thermal_work);
	remove_sysfs_cputemp_files(&cpu_hwmon_dev->kobj);
	sysfs_remove_group(&cpu_hwmon_dev->kobj,
				&cpu_hwmon_attribute_group);
	hwmon_device_unregister(cpu_hwmon_dev);
}

module_init(loongson_hwmon_init);
module_exit(loongson_hwmon_exit);

MODULE_AUTHOR("Yu Xiang <xiangy@lemote.com>");
MODULE_AUTHOR("Huacai Chen <chenhc@lemote.com>");
MODULE_DESCRIPTION("Loongson CPU Hwmon driver");
MODULE_LICENSE("GPL");