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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c 
 kernel/drivers/platform/mips/cpu_hwmon.c
....@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 #include <linux/err.h>
23 #include <linux/module.h>
34 #include <linux/reboot.h>
....@@ -8,6 +9,9 @@
89 #include <loongson.h>
910 #include <boot_param.h>
1011 #include <loongson_hwmon.h>
12
+#include <loongson_regs.h>
13
+
14
+static int csr_temp_enable;
1115 
1216 /*
1317  * Loongson-3 series cpu has two sensors inside,
....@@ -19,90 +23,43 @@
1923 {
2024 	u32 reg, prid_rev;
2125 
26
+	if (csr_temp_enable) {
27
+		reg = (csr_readl(LOONGSON_CSR_CPUTEMP) & 0xff);
28
+		goto out;
29
+	}
30
+
2231 	reg = LOONGSON_CHIPTEMP(cpu);
2332 	prid_rev = read_c0_prid() & PRID_REV_MASK;
33
+
2434 	switch (prid_rev) {
2535 	case PRID_REV_LOONGSON3A_R1:
2636 		reg = (reg >> 8) & 0xff;
2737 		break;
28
-	case PRID_REV_LOONGSON3A_R2:
2938 	case PRID_REV_LOONGSON3B_R1:
3039 	case PRID_REV_LOONGSON3B_R2:
40
+	case PRID_REV_LOONGSON3A_R2_0:
41
+	case PRID_REV_LOONGSON3A_R2_1:
3142 		reg = ((reg >> 8) & 0xff) - 100;
3243 		break;
3344 	case PRID_REV_LOONGSON3A_R3_0:
3445 	case PRID_REV_LOONGSON3A_R3_1:
35
-		reg = (reg & 0xffff)*731/0x4000 - 273;
46
+	default:
47
+		reg = (reg & 0xffff) * 731 / 0x4000 - 273;
3648 		break;
3749 	}
50
+
51
+out:
3852 	return (int)reg * 1000;
3953 }
4054 
4155 static int nr_packages;
4256 static struct device *cpu_hwmon_dev;
4357 
44
-static ssize_t get_hwmon_name(struct device *dev,
45
-			struct device_attribute *attr, char *buf);
46
-static SENSOR_DEVICE_ATTR(name, S_IRUGO, get_hwmon_name, NULL, 0);
47
-
48
-static struct attribute *cpu_hwmon_attributes[] = {
49
-	&sensor_dev_attr_name.dev_attr.attr,
50
-	NULL
51
-};
52
-
53
-/* Hwmon device attribute group */
54
-static struct attribute_group cpu_hwmon_attribute_group = {
55
-	.attrs = cpu_hwmon_attributes,
56
-};
57
-
58
-/* Hwmon device get name */
59
-static ssize_t get_hwmon_name(struct device *dev,
60
-			struct device_attribute *attr, char *buf)
61
-{
62
-	return sprintf(buf, "cpu-hwmon\n");
63
-}
64
-
65
-static ssize_t get_cpu_temp(struct device *dev,
66
-			struct device_attribute *attr, char *buf);
67
-static ssize_t cpu_temp_label(struct device *dev,
68
-			struct device_attribute *attr, char *buf);
69
-
70
-static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, get_cpu_temp, NULL, 1);
71
-static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, cpu_temp_label, NULL, 1);
72
-static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, get_cpu_temp, NULL, 2);
73
-static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, cpu_temp_label, NULL, 2);
74
-static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, get_cpu_temp, NULL, 3);
75
-static SENSOR_DEVICE_ATTR(temp3_label, S_IRUGO, cpu_temp_label, NULL, 3);
76
-static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, get_cpu_temp, NULL, 4);
77
-static SENSOR_DEVICE_ATTR(temp4_label, S_IRUGO, cpu_temp_label, NULL, 4);
78
-
79
-static const struct attribute *hwmon_cputemp[4][3] = {
80
-	{
81
-		&sensor_dev_attr_temp1_input.dev_attr.attr,
82
-		&sensor_dev_attr_temp1_label.dev_attr.attr,
83
-		NULL
84
-	},
85
-	{
86
-		&sensor_dev_attr_temp2_input.dev_attr.attr,
87
-		&sensor_dev_attr_temp2_label.dev_attr.attr,
88
-		NULL
89
-	},
90
-	{
91
-		&sensor_dev_attr_temp3_input.dev_attr.attr,
92
-		&sensor_dev_attr_temp3_label.dev_attr.attr,
93
-		NULL
94
-	},
95
-	{
96
-		&sensor_dev_attr_temp4_input.dev_attr.attr,
97
-		&sensor_dev_attr_temp4_label.dev_attr.attr,
98
-		NULL
99
-	}
100
-};
101
-
10258 static ssize_t cpu_temp_label(struct device *dev,
10359 			struct device_attribute *attr, char *buf)
10460 {
10561 	int id = (to_sensor_dev_attr(attr))->index - 1;
62
+
10663 	return sprintf(buf, "CPU %d Temperature\n", id);
10764 }
10865 
....@@ -111,97 +68,96 @@
11168 {
11269 	int id = (to_sensor_dev_attr(attr))->index - 1;
11370 	int value = loongson3_cpu_temp(id);
71
+
11472 	return sprintf(buf, "%d\n", value);
11573 }
11674 
117
-static int create_sysfs_cputemp_files(struct kobject *kobj)
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)
11898 {
119
-	int i, ret = 0;
99
+	int id = i / 2;
120100 
121
-	for (i=0; i<nr_packages; i++)
122
-		ret = sysfs_create_files(kobj, hwmon_cputemp[i]);
123
-
124
-	return ret;
101
+	if (id < nr_packages)
102
+		return attr->mode;
103
+	return 0;
125104 }
126105 
127
-static void remove_sysfs_cputemp_files(struct kobject *kobj)
128
-{
129
-	int i;
106
+static struct attribute_group cpu_hwmon_group = {
107
+	.attrs = cpu_hwmon_attributes,
108
+	.is_visible = cpu_hwmon_is_visible,
109
+};
130110 
131
-	for (i=0; i<nr_packages; i++)
132
-		sysfs_remove_files(kobj, hwmon_cputemp[i]);
133
-}
111
+static const struct attribute_group *cpu_hwmon_groups[] = {
112
+	&cpu_hwmon_group,
113
+	NULL
114
+};
134115 
135116 #define CPU_THERMAL_THRESHOLD 90000
136117 static struct delayed_work thermal_work;
137118 
138119 static void do_thermal_timer(struct work_struct *work)
139120 {
140
-	int i, value, temp_max = 0;
121
+	int i, value;
141122 
142
-	for (i=0; i<nr_packages; i++) {
123
+	for (i = 0; i < nr_packages; i++) {
143124 		value = loongson3_cpu_temp(i);
144
-		if (value > temp_max)
145
-			temp_max = value;
125
+		if (value > CPU_THERMAL_THRESHOLD) {
126
+			pr_emerg("Power off due to high temp: %d\n", value);
127
+			orderly_poweroff(true);
128
+		}
146129 	}
147130 
148
-	if (temp_max <= CPU_THERMAL_THRESHOLD)
149
-		schedule_delayed_work(&thermal_work, msecs_to_jiffies(5000));
150
-	else
151
-		orderly_poweroff(true);
131
+	schedule_delayed_work(&thermal_work, msecs_to_jiffies(5000));
152132 }
153133 
154134 static int __init loongson_hwmon_init(void)
155135 {
156
-	int ret;
157
-
158136 	pr_info("Loongson Hwmon Enter...\n");
159137 
160
-	cpu_hwmon_dev = hwmon_device_register(NULL);
161
-	if (IS_ERR(cpu_hwmon_dev)) {
162
-		ret = PTR_ERR(cpu_hwmon_dev);
163
-		pr_err("hwmon_device_register fail!\n");
164
-		goto fail_hwmon_device_register;
165
-	}
138
+	if (cpu_has_csr())
139
+		csr_temp_enable = csr_readl(LOONGSON_CSR_FEATURES) &
140
+				  LOONGSON_CSRF_TEMP;
166141 
167142 	nr_packages = loongson_sysconf.nr_cpus /
168143 		loongson_sysconf.cores_per_package;
169144 
170
-	ret = sysfs_create_group(&cpu_hwmon_dev->kobj,
171
-				&cpu_hwmon_attribute_group);
172
-	if (ret) {
173
-		pr_err("fail to create loongson hwmon!\n");
174
-		goto fail_sysfs_create_group_hwmon;
175
-	}
176
-
177
-	ret = create_sysfs_cputemp_files(&cpu_hwmon_dev->kobj);
178
-	if (ret) {
179
-		pr_err("fail to create cpu temperature interface!\n");
180
-		goto fail_create_sysfs_cputemp_files;
145
+	cpu_hwmon_dev = hwmon_device_register_with_groups(NULL, "cpu_hwmon",
146
+							  NULL, cpu_hwmon_groups);
147
+	if (IS_ERR(cpu_hwmon_dev)) {
148
+		pr_err("hwmon_device_register fail!\n");
149
+		return PTR_ERR(cpu_hwmon_dev);
181150 	}
182151 
183152 	INIT_DEFERRABLE_WORK(&thermal_work, do_thermal_timer);
184153 	schedule_delayed_work(&thermal_work, msecs_to_jiffies(20000));
185154 
186
-	return ret;
187
-
188
-fail_create_sysfs_cputemp_files:
189
-	sysfs_remove_group(&cpu_hwmon_dev->kobj,
190
-				&cpu_hwmon_attribute_group);
191
-
192
-fail_sysfs_create_group_hwmon:
193
-	hwmon_device_unregister(cpu_hwmon_dev);
194
-
195
-fail_hwmon_device_register:
196
-	return ret;
155
+	return 0;
197156 }
198157 
199158 static void __exit loongson_hwmon_exit(void)
200159 {
201160 	cancel_delayed_work_sync(&thermal_work);
202
-	remove_sysfs_cputemp_files(&cpu_hwmon_dev->kobj);
203
-	sysfs_remove_group(&cpu_hwmon_dev->kobj,
204
-				&cpu_hwmon_attribute_group);
205161 	hwmon_device_unregister(cpu_hwmon_dev);
206162 }
207163