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k8temp.c
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1 /*
2  * k8temp.c - Linux kernel module for hardware monitoring
3  *
4  * Copyright (C) 2006 Rudolf Marek <[email protected]>
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 
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  u8 swap_core_select; /* meaning of SEL_CORE is inverted */
51  u32 temp_offset;
52 };
53 
54 static 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 
103 static ssize_t show_name(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 
112 static ssize_t show_temp(struct device *dev,
113  struct device_attribute *devattr, 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 
132 static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, 0);
133 static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 0, 1);
134 static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp, NULL, 1, 0);
135 static SENSOR_DEVICE_ATTR_2(temp4_input, S_IRUGO, show_temp, NULL, 1, 1);
136 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
137 
138 static DEFINE_PCI_DEVICE_TABLE(k8temp_ids) = {
139  { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB_MISC) },
140  { 0 },
141 };
142 
143 MODULE_DEVICE_TABLE(pci, k8temp_ids);
144 
145 static int __devinit 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 
176 static int __devinit 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_mask;
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, "Temperature readouts might be wrong - "
204  "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 
294 exit_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 
307 static void __devexit 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 
323 static struct pci_driver k8temp_driver = {
324  .name = "k8temp",
325  .id_table = k8temp_ids,
326  .probe = k8temp_probe,
327  .remove = __devexit_p(k8temp_remove),
328 };
329 
330 module_pci_driver(k8temp_driver);
331 
332 MODULE_AUTHOR("Rudolf Marek <[email protected]>");
333 MODULE_DESCRIPTION("AMD K8 core temperature monitor");
334 MODULE_LICENSE("GPL");
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