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Rudolf Marek29fa06c2006-08-28 14:40:17 +02001/*
2 * k8temp.c - Linux kernel module for hardware monitoring
3 *
Jean Delvare7188cc62006-12-12 18:18:30 +01004 * Copyright (C) 2006 Rudolf Marek <r.marek@assembler.cz>
Rudolf Marek29fa06c2006-08-28 14:40:17 +02005 *
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>
Andreas Herrmannbb9a35f2009-01-15 22:27:46 +010034#include <asm/processor.h>
Rudolf Marek29fa06c2006-08-28 14:40:17 +020035
36#define TEMP_FROM_REG(val) (((((val) >> 16) & 0xff) - 49) * 1000)
37#define REG_TEMP 0xe4
38#define SEL_PLACE 0x40
39#define SEL_CORE 0x04
40
41struct k8temp_data {
Tony Jones1beeffe2007-08-20 13:46:20 -070042 struct device *hwmon_dev;
Rudolf Marek29fa06c2006-08-28 14:40:17 +020043 struct mutex update_lock;
44 const char *name;
45 char valid; /* zero until following fields are valid */
46 unsigned long last_updated; /* in jiffies */
47
48 /* registers values */
49 u8 sensorsp; /* sensor presence bits - SEL_CORE & SEL_PLACE */
50 u32 temp[2][2]; /* core, place */
Andreas Herrmanna2e066b2009-01-15 22:27:47 +010051 u8 swap_core_select; /* meaning of SEL_CORE is inverted */
Andreas Herrmann76ff08d2009-01-15 22:27:47 +010052 u32 temp_offset;
Rudolf Marek29fa06c2006-08-28 14:40:17 +020053};
54
55static struct k8temp_data *k8temp_update_device(struct device *dev)
56{
57 struct k8temp_data *data = dev_get_drvdata(dev);
58 struct pci_dev *pdev = to_pci_dev(dev);
59 u8 tmp;
60
61 mutex_lock(&data->update_lock);
62
63 if (!data->valid
64 || time_after(jiffies, data->last_updated + HZ)) {
65 pci_read_config_byte(pdev, REG_TEMP, &tmp);
66 tmp &= ~(SEL_PLACE | SEL_CORE); /* Select sensor 0, core0 */
67 pci_write_config_byte(pdev, REG_TEMP, tmp);
68 pci_read_config_dword(pdev, REG_TEMP, &data->temp[0][0]);
69
70 if (data->sensorsp & SEL_PLACE) {
71 tmp |= SEL_PLACE; /* Select sensor 1, core0 */
72 pci_write_config_byte(pdev, REG_TEMP, tmp);
73 pci_read_config_dword(pdev, REG_TEMP,
74 &data->temp[0][1]);
75 }
76
77 if (data->sensorsp & SEL_CORE) {
78 tmp &= ~SEL_PLACE; /* Select sensor 0, core1 */
79 tmp |= SEL_CORE;
80 pci_write_config_byte(pdev, REG_TEMP, tmp);
81 pci_read_config_dword(pdev, REG_TEMP,
82 &data->temp[1][0]);
83
84 if (data->sensorsp & SEL_PLACE) {
85 tmp |= SEL_PLACE; /* Select sensor 1, core1 */
86 pci_write_config_byte(pdev, REG_TEMP, tmp);
87 pci_read_config_dword(pdev, REG_TEMP,
88 &data->temp[1][1]);
89 }
90 }
91
92 data->last_updated = jiffies;
93 data->valid = 1;
94 }
95
96 mutex_unlock(&data->update_lock);
97 return data;
98}
99
100/*
101 * Sysfs stuff
102 */
103
104static ssize_t show_name(struct device *dev, struct device_attribute
105 *devattr, char *buf)
106{
107 struct k8temp_data *data = dev_get_drvdata(dev);
108
109 return sprintf(buf, "%s\n", data->name);
110}
111
112
113static ssize_t show_temp(struct device *dev,
114 struct device_attribute *devattr, char *buf)
115{
116 struct sensor_device_attribute_2 *attr =
117 to_sensor_dev_attr_2(devattr);
118 int core = attr->nr;
119 int place = attr->index;
Andreas Herrmann76ff08d2009-01-15 22:27:47 +0100120 int temp;
Rudolf Marek29fa06c2006-08-28 14:40:17 +0200121 struct k8temp_data *data = k8temp_update_device(dev);
122
Andreas Herrmanna2e066b2009-01-15 22:27:47 +0100123 if (data->swap_core_select)
124 core = core ? 0 : 1;
125
Andreas Herrmann76ff08d2009-01-15 22:27:47 +0100126 temp = TEMP_FROM_REG(data->temp[core][place]) + data->temp_offset;
127
128 return sprintf(buf, "%d\n", temp);
Rudolf Marek29fa06c2006-08-28 14:40:17 +0200129}
130
131/* core, place */
132
133static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, 0);
134static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 0, 1);
135static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp, NULL, 1, 0);
136static SENSOR_DEVICE_ATTR_2(temp4_input, S_IRUGO, show_temp, NULL, 1, 1);
137static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
138
139static struct pci_device_id k8temp_ids[] = {
140 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB_MISC) },
141 { 0 },
142};
143
Jean Delvareb17ebc92006-08-28 14:41:03 +0200144MODULE_DEVICE_TABLE(pci, k8temp_ids);
145
Rudolf Marek29fa06c2006-08-28 14:40:17 +0200146static int __devinit k8temp_probe(struct pci_dev *pdev,
147 const struct pci_device_id *id)
148{
149 int err;
150 u8 scfg;
151 u32 temp;
Andreas Herrmannbb9a35f2009-01-15 22:27:46 +0100152 u8 model, stepping;
Rudolf Marek29fa06c2006-08-28 14:40:17 +0200153 struct k8temp_data *data;
Rudolf Marek29fa06c2006-08-28 14:40:17 +0200154
155 if (!(data = kzalloc(sizeof(struct k8temp_data), GFP_KERNEL))) {
156 err = -ENOMEM;
157 goto exit;
158 }
159
Andreas Herrmannbb9a35f2009-01-15 22:27:46 +0100160 model = boot_cpu_data.x86_model;
161 stepping = boot_cpu_data.x86_mask;
162
163 switch (boot_cpu_data.x86) {
164 case 0xf:
165 /* feature available since SH-C0, exclude older revisions */
166 if (((model == 4) && (stepping == 0)) ||
167 ((model == 5) && (stepping <= 1))) {
168 err = -ENODEV;
169 goto exit_free;
170 }
171
Andreas Herrmanna2e066b2009-01-15 22:27:47 +0100172 /*
173 * AMD NPT family 0fh, i.e. RevF and RevG:
174 * meaning of SEL_CORE bit is inverted
175 */
Andreas Herrmannbb9a35f2009-01-15 22:27:46 +0100176 if (model >= 0x40) {
Andreas Herrmanna2e066b2009-01-15 22:27:47 +0100177 data->swap_core_select = 1;
Andreas Herrmannbb9a35f2009-01-15 22:27:46 +0100178 dev_warn(&pdev->dev, "Temperature readouts might be "
179 "wrong - check erratum #141\n");
180 }
181
Andreas Herrmann76ff08d2009-01-15 22:27:47 +0100182 if ((model >= 0x69) &&
183 !(model == 0xc1 || model == 0x6c || model == 0x7c)) {
184 /*
185 * RevG desktop CPUs (i.e. no socket S1G1 parts)
186 * need additional offset, otherwise reported
187 * temperature is below ambient temperature
188 */
189 data->temp_offset = 21000;
190 }
191
Andreas Herrmannbb9a35f2009-01-15 22:27:46 +0100192 break;
193 }
194
Rudolf Marek29fa06c2006-08-28 14:40:17 +0200195 pci_read_config_byte(pdev, REG_TEMP, &scfg);
196 scfg &= ~(SEL_PLACE | SEL_CORE); /* Select sensor 0, core0 */
197 pci_write_config_byte(pdev, REG_TEMP, scfg);
198 pci_read_config_byte(pdev, REG_TEMP, &scfg);
199
200 if (scfg & (SEL_PLACE | SEL_CORE)) {
201 dev_err(&pdev->dev, "Configuration bit(s) stuck at 1!\n");
202 err = -ENODEV;
203 goto exit_free;
204 }
205
206 scfg |= (SEL_PLACE | SEL_CORE);
207 pci_write_config_byte(pdev, REG_TEMP, scfg);
208
209 /* now we know if we can change core and/or sensor */
210 pci_read_config_byte(pdev, REG_TEMP, &data->sensorsp);
211
212 if (data->sensorsp & SEL_PLACE) {
213 scfg &= ~SEL_CORE; /* Select sensor 1, core0 */
214 pci_write_config_byte(pdev, REG_TEMP, scfg);
215 pci_read_config_dword(pdev, REG_TEMP, &temp);
216 scfg |= SEL_CORE; /* prepare for next selection */
217 if (!((temp >> 16) & 0xff)) /* if temp is 0 -49C is not likely */
218 data->sensorsp &= ~SEL_PLACE;
219 }
220
221 if (data->sensorsp & SEL_CORE) {
222 scfg &= ~SEL_PLACE; /* Select sensor 0, core1 */
223 pci_write_config_byte(pdev, REG_TEMP, scfg);
224 pci_read_config_dword(pdev, REG_TEMP, &temp);
225 if (!((temp >> 16) & 0xff)) /* if temp is 0 -49C is not likely */
226 data->sensorsp &= ~SEL_CORE;
227 }
228
229 data->name = "k8temp";
230 mutex_init(&data->update_lock);
231 dev_set_drvdata(&pdev->dev, data);
232
233 /* Register sysfs hooks */
234 err = device_create_file(&pdev->dev,
235 &sensor_dev_attr_temp1_input.dev_attr);
236 if (err)
237 goto exit_remove;
238
239 /* sensor can be changed and reports something */
240 if (data->sensorsp & SEL_PLACE) {
241 err = device_create_file(&pdev->dev,
242 &sensor_dev_attr_temp2_input.dev_attr);
243 if (err)
244 goto exit_remove;
245 }
246
247 /* core can be changed and reports something */
248 if (data->sensorsp & SEL_CORE) {
249 err = device_create_file(&pdev->dev,
250 &sensor_dev_attr_temp3_input.dev_attr);
251 if (err)
252 goto exit_remove;
253 if (data->sensorsp & SEL_PLACE)
254 err = device_create_file(&pdev->dev,
255 &sensor_dev_attr_temp4_input.
256 dev_attr);
257 if (err)
258 goto exit_remove;
259 }
260
261 err = device_create_file(&pdev->dev, &dev_attr_name);
262 if (err)
263 goto exit_remove;
264
Tony Jones1beeffe2007-08-20 13:46:20 -0700265 data->hwmon_dev = hwmon_device_register(&pdev->dev);
Rudolf Marek29fa06c2006-08-28 14:40:17 +0200266
Tony Jones1beeffe2007-08-20 13:46:20 -0700267 if (IS_ERR(data->hwmon_dev)) {
268 err = PTR_ERR(data->hwmon_dev);
Rudolf Marek29fa06c2006-08-28 14:40:17 +0200269 goto exit_remove;
270 }
271
272 return 0;
273
274exit_remove:
275 device_remove_file(&pdev->dev,
276 &sensor_dev_attr_temp1_input.dev_attr);
277 device_remove_file(&pdev->dev,
278 &sensor_dev_attr_temp2_input.dev_attr);
279 device_remove_file(&pdev->dev,
280 &sensor_dev_attr_temp3_input.dev_attr);
281 device_remove_file(&pdev->dev,
282 &sensor_dev_attr_temp4_input.dev_attr);
283 device_remove_file(&pdev->dev, &dev_attr_name);
284exit_free:
285 dev_set_drvdata(&pdev->dev, NULL);
286 kfree(data);
287exit:
288 return err;
289}
290
291static void __devexit k8temp_remove(struct pci_dev *pdev)
292{
293 struct k8temp_data *data = dev_get_drvdata(&pdev->dev);
294
Tony Jones1beeffe2007-08-20 13:46:20 -0700295 hwmon_device_unregister(data->hwmon_dev);
Rudolf Marek29fa06c2006-08-28 14:40:17 +0200296 device_remove_file(&pdev->dev,
297 &sensor_dev_attr_temp1_input.dev_attr);
298 device_remove_file(&pdev->dev,
299 &sensor_dev_attr_temp2_input.dev_attr);
300 device_remove_file(&pdev->dev,
301 &sensor_dev_attr_temp3_input.dev_attr);
302 device_remove_file(&pdev->dev,
303 &sensor_dev_attr_temp4_input.dev_attr);
304 device_remove_file(&pdev->dev, &dev_attr_name);
305 dev_set_drvdata(&pdev->dev, NULL);
306 kfree(data);
307}
308
309static struct pci_driver k8temp_driver = {
310 .name = "k8temp",
311 .id_table = k8temp_ids,
312 .probe = k8temp_probe,
313 .remove = __devexit_p(k8temp_remove),
314};
315
316static int __init k8temp_init(void)
317{
318 return pci_register_driver(&k8temp_driver);
319}
320
321static void __exit k8temp_exit(void)
322{
323 pci_unregister_driver(&k8temp_driver);
324}
325
Jean Delvare7188cc62006-12-12 18:18:30 +0100326MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>");
Rudolf Marek29fa06c2006-08-28 14:40:17 +0200327MODULE_DESCRIPTION("AMD K8 core temperature monitor");
328MODULE_LICENSE("GPL");
329
330module_init(k8temp_init)
331module_exit(k8temp_exit)