Version:  2.0.40 2.2.26 2.4.37 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17

Linux/drivers/hwmon/k8temp.c

  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 
 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 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 
143 MODULE_DEVICE_TABLE(pci, k8temp_ids);
144 
145 static 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 
176 static 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_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,
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 
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 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 = k8temp_remove,
328 };
329 
330 module_pci_driver(k8temp_driver);
331 
332 MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>");
333 MODULE_DESCRIPTION("AMD K8 core temperature monitor");
334 MODULE_LICENSE("GPL");
335 

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