1 /*
2 * k8temp.c - Linux kernel module for hardware monitoring
3 *
4 * Copyright (C) 2006 Rudolf Marek <r.marek@assembler.cz>
5 *
6 * Inspired from the w83785 and amd756 drivers.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
21 * 02110-1301 USA.
22 */
23
24 #include <linux/module.h>
25 #include <linux/delay.h>
26 #include <linux/init.h>
27 #include <linux/slab.h>
28 #include <linux/jiffies.h>
29 #include <linux/pci.h>
30 #include <linux/hwmon.h>
31 #include <linux/hwmon-sysfs.h>
32 #include <linux/err.h>
33 #include <linux/mutex.h>
34
35 #define TEMP_FROM_REG(val) (((((val) >> 16) & 0xff) - 49) * 1000)
36 #define REG_TEMP 0xe4
37 #define SEL_PLACE 0x40
38 #define SEL_CORE 0x04
39
40 struct k8temp_data {
41 struct device *hwmon_dev;
42 struct mutex update_lock;
43 const char *name;
44 char valid; /* zero until following fields are valid */
45 unsigned long last_updated; /* in jiffies */
46
47 /* registers values */
48 u8 sensorsp; /* sensor presence bits - SEL_CORE & SEL_PLACE */
49 u32 temp[2][2]; /* core, place */
50 };
51
52 static struct k8temp_data *k8temp_update_device(struct device *dev)
53 {
54 struct k8temp_data *data = dev_get_drvdata(dev);
55 struct pci_dev *pdev = to_pci_dev(dev);
56 u8 tmp;
57
58 mutex_lock(&data->update_lock);
59
60 if (!data->valid
61 || time_after(jiffies, data->last_updated + HZ)) {
62 pci_read_config_byte(pdev, REG_TEMP, &tmp);
63 tmp &= ~(SEL_PLACE | SEL_CORE); /* Select sensor 0, core0 */
64 pci_write_config_byte(pdev, REG_TEMP, tmp);
65 pci_read_config_dword(pdev, REG_TEMP, &data->temp[0][0]);
66
67 if (data->sensorsp & SEL_PLACE) {
68 tmp |= SEL_PLACE; /* Select sensor 1, core0 */
69 pci_write_config_byte(pdev, REG_TEMP, tmp);
70 pci_read_config_dword(pdev, REG_TEMP,
71 &data->temp[0][1]);
72 }
73
74 if (data->sensorsp & SEL_CORE) {
75 tmp &= ~SEL_PLACE; /* Select sensor 0, core1 */
76 tmp |= SEL_CORE;
77 pci_write_config_byte(pdev, REG_TEMP, tmp);
78 pci_read_config_dword(pdev, REG_TEMP,
79 &data->temp[1][0]);
80
81 if (data->sensorsp & SEL_PLACE) {
82 tmp |= SEL_PLACE; /* Select sensor 1, core1 */
83 pci_write_config_byte(pdev, REG_TEMP, tmp);
84 pci_read_config_dword(pdev, REG_TEMP,
85 &data->temp[1][1]);
86 }
87 }
88
89 data->last_updated = jiffies;
90 data->valid = 1;
91 }
92
93 mutex_unlock(&data->update_lock);
94 return data;
95 }
96
97 /*
98 * Sysfs stuff
99 */
100
101 static ssize_t show_name(struct device *dev, struct device_attribute
102 *devattr, char *buf)
103 {
104 struct k8temp_data *data = dev_get_drvdata(dev);
105
106 return sprintf(buf, "%s\n", data->name);
107 }
108
109
110 static ssize_t show_temp(struct device *dev,
111 struct device_attribute *devattr, char *buf)
112 {
113 struct sensor_device_attribute_2 *attr =
114 to_sensor_dev_attr_2(devattr);
115 int core = attr->nr;
116 int place = attr->index;
117 struct k8temp_data *data = k8temp_update_device(dev);
118
119 return sprintf(buf, "%d\n",
120 TEMP_FROM_REG(data->temp[core][place]));
121 }
122
123 /* core, place */
124
125 static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, 0);
126 static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 0, 1);
127 static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp, NULL, 1, 0);
128 static SENSOR_DEVICE_ATTR_2(temp4_input, S_IRUGO, show_temp, NULL, 1, 1);
129 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
130
131 static struct pci_device_id k8temp_ids[] = {
132 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB_MISC) },
133 { 0 },
134 };
135
136 MODULE_DEVICE_TABLE(pci, k8temp_ids);
137
138 static int __devinit k8temp_probe(struct pci_dev *pdev,
139 const struct pci_device_id *id)
140 {
141 int err;
142 u8 scfg;
143 u32 temp;
144 struct k8temp_data *data;
145 u32 cpuid = cpuid_eax(1);
146
147 /* this feature should be available since SH-C0 core */
148 if ((cpuid == 0xf40) || (cpuid == 0xf50) || (cpuid == 0xf51)) {
149 err = -ENODEV;
150 goto exit;
151 }
152
153 if (!(data = kzalloc(sizeof(struct k8temp_data), GFP_KERNEL))) {
154 err = -ENOMEM;
155 goto exit;
156 }
157
158 pci_read_config_byte(pdev, REG_TEMP, &scfg);
159 scfg &= ~(SEL_PLACE | SEL_CORE); /* Select sensor 0, core0 */
160 pci_write_config_byte(pdev, REG_TEMP, scfg);
161 pci_read_config_byte(pdev, REG_TEMP, &scfg);
162
163 if (scfg & (SEL_PLACE | SEL_CORE)) {
164 dev_err(&pdev->dev, "Configuration bit(s) stuck at 1!\n");
165 err = -ENODEV;
166 goto exit_free;
167 }
168
169 scfg |= (SEL_PLACE | SEL_CORE);
170 pci_write_config_byte(pdev, REG_TEMP, scfg);
171
172 /* now we know if we can change core and/or sensor */
173 pci_read_config_byte(pdev, REG_TEMP, &data->sensorsp);
174
175 if (data->sensorsp & SEL_PLACE) {
176 scfg &= ~SEL_CORE; /* Select sensor 1, core0 */
177 pci_write_config_byte(pdev, REG_TEMP, scfg);
178 pci_read_config_dword(pdev, REG_TEMP, &temp);
179 scfg |= SEL_CORE; /* prepare for next selection */
180 if (!((temp >> 16) & 0xff)) /* if temp is 0 -49C is not likely */
181 data->sensorsp &= ~SEL_PLACE;
182 }
183
184 if (data->sensorsp & SEL_CORE) {
185 scfg &= ~SEL_PLACE; /* Select sensor 0, core1 */
186 pci_write_config_byte(pdev, REG_TEMP, scfg);
187 pci_read_config_dword(pdev, REG_TEMP, &temp);
188 if (!((temp >> 16) & 0xff)) /* if temp is 0 -49C is not likely */
189 data->sensorsp &= ~SEL_CORE;
190 }
191
192 data->name = "k8temp";
193 mutex_init(&data->update_lock);
194 dev_set_drvdata(&pdev->dev, data);
195
196 /* Register sysfs hooks */
197 err = device_create_file(&pdev->dev,
198 &sensor_dev_attr_temp1_input.dev_attr);
199 if (err)
200 goto exit_remove;
201
202 /* sensor can be changed and reports something */
203 if (data->sensorsp & SEL_PLACE) {
204 err = device_create_file(&pdev->dev,
205 &sensor_dev_attr_temp2_input.dev_attr);
206 if (err)
207 goto exit_remove;
208 }
209
210 /* core can be changed and reports something */
211 if (data->sensorsp & SEL_CORE) {
212 err = device_create_file(&pdev->dev,
213 &sensor_dev_attr_temp3_input.dev_attr);
214 if (err)
215 goto exit_remove;
216 if (data->sensorsp & SEL_PLACE)
217 err = device_create_file(&pdev->dev,
218 &sensor_dev_attr_temp4_input.
219 dev_attr);
220 if (err)
221 goto exit_remove;
222 }
223
224 err = device_create_file(&pdev->dev, &dev_attr_name);
225 if (err)
226 goto exit_remove;
227
228 data->hwmon_dev = hwmon_device_register(&pdev->dev);
229
230 if (IS_ERR(data->hwmon_dev)) {
231 err = PTR_ERR(data->hwmon_dev);
232 goto exit_remove;
233 }
234
235 return 0;
236
237 exit_remove:
238 device_remove_file(&pdev->dev,
239 &sensor_dev_attr_temp1_input.dev_attr);
240 device_remove_file(&pdev->dev,
241 &sensor_dev_attr_temp2_input.dev_attr);
242 device_remove_file(&pdev->dev,
243 &sensor_dev_attr_temp3_input.dev_attr);
244 device_remove_file(&pdev->dev,
245 &sensor_dev_attr_temp4_input.dev_attr);
246 device_remove_file(&pdev->dev, &dev_attr_name);
247 exit_free:
248 dev_set_drvdata(&pdev->dev, NULL);
249 kfree(data);
250 exit:
251 return err;
252 }
253
254 static void __devexit k8temp_remove(struct pci_dev *pdev)
255 {
256 struct k8temp_data *data = dev_get_drvdata(&pdev->dev);
257
258 hwmon_device_unregister(data->hwmon_dev);
259 device_remove_file(&pdev->dev,
260 &sensor_dev_attr_temp1_input.dev_attr);
261 device_remove_file(&pdev->dev,
262 &sensor_dev_attr_temp2_input.dev_attr);
263 device_remove_file(&pdev->dev,
264 &sensor_dev_attr_temp3_input.dev_attr);
265 device_remove_file(&pdev->dev,
266 &sensor_dev_attr_temp4_input.dev_attr);
267 device_remove_file(&pdev->dev, &dev_attr_name);
268 dev_set_drvdata(&pdev->dev, NULL);
269 kfree(data);
270 }
271
272 static struct pci_driver k8temp_driver = {
273 .name = "k8temp",
274 .id_table = k8temp_ids,
275 .probe = k8temp_probe,
276 .remove = __devexit_p(k8temp_remove),
277 };
278
279 static int __init k8temp_init(void)
280 {
281 return pci_register_driver(&k8temp_driver);
282 }
283
284 static void __exit k8temp_exit(void)
285 {
286 pci_unregister_driver(&k8temp_driver);
287 }
288
289 MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>");
290 MODULE_DESCRIPTION("AMD K8 core temperature monitor");
291 MODULE_LICENSE("GPL");
292
293 module_init(k8temp_init)
294 module_exit(k8temp_exit)
295
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