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/init.h>
26#include <linux/slab.h>
27#include <linux/jiffies.h>
28#include <linux/pci.h>
29#include <linux/hwmon.h>
30#include <linux/hwmon-sysfs.h>
31#include <linux/err.h>
32#include <linux/mutex.h>
33#include <asm/processor.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
40struct 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 u8 swap_core_select; /* meaning of SEL_CORE is inverted */
51 u32 temp_offset;
52};
53
54static struct k8temp_data *k8temp_update_device(struct device *dev)
55{
56 struct k8temp_data *data = dev_get_drvdata(dev);
57 struct pci_dev *pdev = to_pci_dev(dev);
58 u8 tmp;
59
60 mutex_lock(&data->update_lock);
61
62 if (!data->valid
63 || time_after(jiffies, data->last_updated + HZ)) {
64 pci_read_config_byte(pdev, REG_TEMP, &tmp);
65 tmp &= ~(SEL_PLACE | SEL_CORE); /* Select sensor 0, core0 */
66 pci_write_config_byte(pdev, REG_TEMP, tmp);
67 pci_read_config_dword(pdev, REG_TEMP, &data->temp[0][0]);
68
69 if (data->sensorsp & SEL_PLACE) {
70 tmp |= SEL_PLACE; /* Select sensor 1, core0 */
71 pci_write_config_byte(pdev, REG_TEMP, tmp);
72 pci_read_config_dword(pdev, REG_TEMP,
73 &data->temp[0][1]);
74 }
75
76 if (data->sensorsp & SEL_CORE) {
77 tmp &= ~SEL_PLACE; /* Select sensor 0, core1 */
78 tmp |= SEL_CORE;
79 pci_write_config_byte(pdev, REG_TEMP, tmp);
80 pci_read_config_dword(pdev, REG_TEMP,
81 &data->temp[1][0]);
82
83 if (data->sensorsp & SEL_PLACE) {
84 tmp |= SEL_PLACE; /* Select sensor 1, core1 */
85 pci_write_config_byte(pdev, REG_TEMP, tmp);
86 pci_read_config_dword(pdev, REG_TEMP,
87 &data->temp[1][1]);
88 }
89 }
90
91 data->last_updated = jiffies;
92 data->valid = 1;
93 }
94
95 mutex_unlock(&data->update_lock);
96 return data;
97}
98
99/*
100 * Sysfs stuff
101 */
102
103static ssize_t name_show(struct device *dev, struct device_attribute
104 *devattr, char *buf)
105{
106 struct k8temp_data *data = dev_get_drvdata(dev);
107
108 return sprintf(buf, "%s\n", data->name);
109}
110
111
112static ssize_t temp_show(struct device *dev, struct device_attribute *devattr,
113 char *buf)
114{
115 struct sensor_device_attribute_2 *attr =
116 to_sensor_dev_attr_2(devattr);
117 int core = attr->nr;
118 int place = attr->index;
119 int temp;
120 struct k8temp_data *data = k8temp_update_device(dev);
121
122 if (data->swap_core_select && (data->sensorsp & SEL_CORE))
123 core = core ? 0 : 1;
124
125 temp = TEMP_FROM_REG(data->temp[core][place]) + data->temp_offset;
126
127 return sprintf(buf, "%d\n", temp);
128}
129
130/* core, place */
131
132static SENSOR_DEVICE_ATTR_2_RO(temp1_input, temp, 0, 0);
133static SENSOR_DEVICE_ATTR_2_RO(temp2_input, temp, 0, 1);
134static SENSOR_DEVICE_ATTR_2_RO(temp3_input, temp, 1, 0);
135static SENSOR_DEVICE_ATTR_2_RO(temp4_input, temp, 1, 1);
136static DEVICE_ATTR_RO(name);
137
138static const struct pci_device_id k8temp_ids[] = {
139 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB_MISC) },
140 { 0 },
141};
142
143MODULE_DEVICE_TABLE(pci, k8temp_ids);
144
145static int is_rev_g_desktop(u8 model)
146{
147 u32 brandidx;
148
149 if (model < 0x69)
150 return 0;
151
152 if (model == 0xc1 || model == 0x6c || model == 0x7c)
153 return 0;
154
155 /*
156 * Differentiate between AM2 and ASB1.
157 * See "Constructing the processor Name String" in "Revision
158 * Guide for AMD NPT Family 0Fh Processors" (33610).
159 */
160 brandidx = cpuid_ebx(0x80000001);
161 brandidx = (brandidx >> 9) & 0x1f;
162
163 /* Single core */
164 if ((model == 0x6f || model == 0x7f) &&
165 (brandidx == 0x7 || brandidx == 0x9 || brandidx == 0xc))
166 return 0;
167
168 /* Dual core */
169 if (model == 0x6b &&
170 (brandidx == 0xb || brandidx == 0xc))
171 return 0;
172
173 return 1;
174}
175
176static int k8temp_probe(struct pci_dev *pdev,
177 const struct pci_device_id *id)
178{
179 int err;
180 u8 scfg;
181 u32 temp;
182 u8 model, stepping;
183 struct k8temp_data *data;
184
185 data = devm_kzalloc(&pdev->dev, sizeof(struct k8temp_data), GFP_KERNEL);
186 if (!data)
187 return -ENOMEM;
188
189 model = boot_cpu_data.x86_model;
190 stepping = boot_cpu_data.x86_stepping;
191
192 /* feature available since SH-C0, exclude older revisions */
193 if ((model == 4 && stepping == 0) ||
194 (model == 5 && stepping <= 1))
195 return -ENODEV;
196
197 /*
198 * AMD NPT family 0fh, i.e. RevF and RevG:
199 * meaning of SEL_CORE bit is inverted
200 */
201 if (model >= 0x40) {
202 data->swap_core_select = 1;
203 dev_warn(&pdev->dev,
204 "Temperature readouts might be wrong - check erratum #141\n");
205 }
206
207 /*
208 * RevG desktop CPUs (i.e. no socket S1G1 or ASB1 parts) need
209 * additional offset, otherwise reported temperature is below
210 * ambient temperature
211 */
212 if (is_rev_g_desktop(model))
213 data->temp_offset = 21000;
214
215 pci_read_config_byte(pdev, REG_TEMP, &scfg);
216 scfg &= ~(SEL_PLACE | SEL_CORE); /* Select sensor 0, core0 */
217 pci_write_config_byte(pdev, REG_TEMP, scfg);
218 pci_read_config_byte(pdev, REG_TEMP, &scfg);
219
220 if (scfg & (SEL_PLACE | SEL_CORE)) {
221 dev_err(&pdev->dev, "Configuration bit(s) stuck at 1!\n");
222 return -ENODEV;
223 }
224
225 scfg |= (SEL_PLACE | SEL_CORE);
226 pci_write_config_byte(pdev, REG_TEMP, scfg);
227
228 /* now we know if we can change core and/or sensor */
229 pci_read_config_byte(pdev, REG_TEMP, &data->sensorsp);
230
231 if (data->sensorsp & SEL_PLACE) {
232 scfg &= ~SEL_CORE; /* Select sensor 1, core0 */
233 pci_write_config_byte(pdev, REG_TEMP, scfg);
234 pci_read_config_dword(pdev, REG_TEMP, &temp);
235 scfg |= SEL_CORE; /* prepare for next selection */
236 if (!((temp >> 16) & 0xff)) /* if temp is 0 -49C is unlikely */
237 data->sensorsp &= ~SEL_PLACE;
238 }
239
240 if (data->sensorsp & SEL_CORE) {
241 scfg &= ~SEL_PLACE; /* Select sensor 0, core1 */
242 pci_write_config_byte(pdev, REG_TEMP, scfg);
243 pci_read_config_dword(pdev, REG_TEMP, &temp);
244 if (!((temp >> 16) & 0xff)) /* if temp is 0 -49C is unlikely */
245 data->sensorsp &= ~SEL_CORE;
246 }
247
248 data->name = "k8temp";
249 mutex_init(&data->update_lock);
250 pci_set_drvdata(pdev, data);
251
252 /* Register sysfs hooks */
253 err = device_create_file(&pdev->dev,
254 &sensor_dev_attr_temp1_input.dev_attr);
255 if (err)
256 goto exit_remove;
257
258 /* sensor can be changed and reports something */
259 if (data->sensorsp & SEL_PLACE) {
260 err = device_create_file(&pdev->dev,
261 &sensor_dev_attr_temp2_input.dev_attr);
262 if (err)
263 goto exit_remove;
264 }
265
266 /* core can be changed and reports something */
267 if (data->sensorsp & SEL_CORE) {
268 err = device_create_file(&pdev->dev,
269 &sensor_dev_attr_temp3_input.dev_attr);
270 if (err)
271 goto exit_remove;
272 if (data->sensorsp & SEL_PLACE) {
273 err = device_create_file(&pdev->dev,
274 &sensor_dev_attr_temp4_input.
275 dev_attr);
276 if (err)
277 goto exit_remove;
278 }
279 }
280
281 err = device_create_file(&pdev->dev, &dev_attr_name);
282 if (err)
283 goto exit_remove;
284
285 data->hwmon_dev = hwmon_device_register(&pdev->dev);
286
287 if (IS_ERR(data->hwmon_dev)) {
288 err = PTR_ERR(data->hwmon_dev);
289 goto exit_remove;
290 }
291
292 return 0;
293
294exit_remove:
295 device_remove_file(&pdev->dev,
296 &sensor_dev_attr_temp1_input.dev_attr);
297 device_remove_file(&pdev->dev,
298 &sensor_dev_attr_temp2_input.dev_attr);
299 device_remove_file(&pdev->dev,
300 &sensor_dev_attr_temp3_input.dev_attr);
301 device_remove_file(&pdev->dev,
302 &sensor_dev_attr_temp4_input.dev_attr);
303 device_remove_file(&pdev->dev, &dev_attr_name);
304 return err;
305}
306
307static void k8temp_remove(struct pci_dev *pdev)
308{
309 struct k8temp_data *data = pci_get_drvdata(pdev);
310
311 hwmon_device_unregister(data->hwmon_dev);
312 device_remove_file(&pdev->dev,
313 &sensor_dev_attr_temp1_input.dev_attr);
314 device_remove_file(&pdev->dev,
315 &sensor_dev_attr_temp2_input.dev_attr);
316 device_remove_file(&pdev->dev,
317 &sensor_dev_attr_temp3_input.dev_attr);
318 device_remove_file(&pdev->dev,
319 &sensor_dev_attr_temp4_input.dev_attr);
320 device_remove_file(&pdev->dev, &dev_attr_name);
321}
322
323static struct pci_driver k8temp_driver = {
324 .name = "k8temp",
325 .id_table = k8temp_ids,
326 .probe = k8temp_probe,
327 .remove = k8temp_remove,
328};
329
330module_pci_driver(k8temp_driver);
331
332MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>");
333MODULE_DESCRIPTION("AMD K8 core temperature monitor");
334MODULE_LICENSE("GPL");
335