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/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 #include <asm/processor.h>
  35
  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
  41 struct k8temp_data {
  42         struct device *hwmon_dev;
  43         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 */
  51         u8 swap_core_select;    /* meaning of SEL_CORE is inverted */
  52         u32 temp_offset;
  53 };
  54
  55 static 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
 104 static 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
 113 static 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;
 120         int temp;
 121         struct k8temp_data *data = k8temp_update_device(dev);
 122
 123         if (data->swap_core_select && (data->sensorsp & SEL_CORE))
 124                 core = core ? 0 : 1;
 125
 126         temp = TEMP_FROM_REG(data->temp[core][place]) + data->temp_offset;
 127
 128         return sprintf(buf, "%d\n", temp);
 129 }
 130
 131 /* core, place */
 132
 133 static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, 0);
 134 static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 0, 1);
 135 static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp, NULL, 1, 0);
 136 static SENSOR_DEVICE_ATTR_2(temp4_input, S_IRUGO, show_temp, NULL, 1, 1);
 137 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
 138
 139 static const struct pci_device_id k8temp_ids[] = {
 140         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB_MISC) },
 141         { 0 },
 142 };
 143
 144 MODULE_DEVICE_TABLE(pci, k8temp_ids);
 145
 146 static int __devinit is_rev_g_desktop(u8 model)
 147 {
 148         u32 brandidx;
 149
 150         if (model < 0x69)
 151                 return 0;
 152
 153         if (model == 0xc1 || model == 0x6c || model == 0x7c)
 154                 return 0;
 155
 156         /*
 157          * Differentiate between AM2 and ASB1.
 158          * See "Constructing the processor Name String" in "Revision
 159          * Guide for AMD NPT Family 0Fh Processors" (33610).
 160          */
 161         brandidx = cpuid_ebx(0x80000001);
 162         brandidx = (brandidx >> 9) & 0x1f;
 163
 164         /* Single core */
 165         if ((model == 0x6f || model == 0x7f) &&
 166             (brandidx == 0x7 || brandidx == 0x9 || brandidx == 0xc))
 167                 return 0;
 168
 169         /* Dual core */
 170         if (model == 0x6b &&
 171             (brandidx == 0xb || brandidx == 0xc))
 172                 return 0;
 173
 174         return 1;
 175 }
 176
 177 static int __devinit k8temp_probe(struct pci_dev *pdev,
 178                                   const struct pci_device_id *id)
 179 {
 180         int err;
 181         u8 scfg;
 182         u32 temp;
 183         u8 model, stepping;
 184         struct k8temp_data *data;
 185
 186         if (!(data = kzalloc(sizeof(struct k8temp_data), GFP_KERNEL))) {
 187                 err = -ENOMEM;
 188                 goto exit;
 189         }
 190
 191         model = boot_cpu_data.x86_model;
 192         stepping = boot_cpu_data.x86_mask;
 193
 194         /* feature available since SH-C0, exclude older revisions */
 195         if (((model == 4) && (stepping == 0)) ||
 196             ((model == 5) && (stepping <= 1))) {
 197                 err = -ENODEV;
 198                 goto exit_free;
 199         }
 200
 201         /*
 202          * AMD NPT family 0fh, i.e. RevF and RevG:
 203          * meaning of SEL_CORE bit is inverted
 204          */
 205         if (model >= 0x40) {
 206                 data->swap_core_select = 1;
 207                 dev_warn(&pdev->dev, "Temperature readouts might be wrong - "
 208                          "check erratum #141\n");
 209         }
 210
 211         /*
 212          * RevG desktop CPUs (i.e. no socket S1G1 or ASB1 parts) need
 213          * additional offset, otherwise reported temperature is below
 214          * ambient temperature
 215          */
 216         if (is_rev_g_desktop(model))
 217                 data->temp_offset = 21000;
 218
 219         pci_read_config_byte(pdev, REG_TEMP, &scfg);
 220         scfg &= ~(SEL_PLACE | SEL_CORE);                /* Select sensor 0, core0 */
 221         pci_write_config_byte(pdev, REG_TEMP, scfg);
 222         pci_read_config_byte(pdev, REG_TEMP, &scfg);
 223
 224         if (scfg & (SEL_PLACE | SEL_CORE)) {
 225                 dev_err(&pdev->dev, "Configuration bit(s) stuck at 1!\n");
 226                 err = -ENODEV;
 227                 goto exit_free;
 228         }
 229
 230         scfg |= (SEL_PLACE | SEL_CORE);
 231         pci_write_config_byte(pdev, REG_TEMP, scfg);
 232
 233         /* now we know if we can change core and/or sensor */
 234         pci_read_config_byte(pdev, REG_TEMP, &data->sensorsp);
 235
 236         if (data->sensorsp & SEL_PLACE) {
 237                 scfg &= ~SEL_CORE;      /* Select sensor 1, core0 */
 238                 pci_write_config_byte(pdev, REG_TEMP, scfg);
 239                 pci_read_config_dword(pdev, REG_TEMP, &temp);
 240                 scfg |= SEL_CORE;       /* prepare for next selection */
 241                 if (!((temp >> 16) & 0xff))     /* if temp is 0 -49C is not likely */
 242                         data->sensorsp &= ~SEL_PLACE;
 243         }
 244
 245         if (data->sensorsp & SEL_CORE) {
 246                 scfg &= ~SEL_PLACE;     /* Select sensor 0, core1 */
 247                 pci_write_config_byte(pdev, REG_TEMP, scfg);
 248                 pci_read_config_dword(pdev, REG_TEMP, &temp);
 249                 if (!((temp >> 16) & 0xff))     /* if temp is 0 -49C is not likely */
 250                         data->sensorsp &= ~SEL_CORE;
 251         }
 252
 253         data->name = "k8temp";
 254         mutex_init(&data->update_lock);
 255         dev_set_drvdata(&pdev->dev, data);
 256
 257         /* Register sysfs hooks */
 258         err = device_create_file(&pdev->dev,
 259                            &sensor_dev_attr_temp1_input.dev_attr);
 260         if (err)
 261                 goto exit_remove;
 262
 263         /* sensor can be changed and reports something */
 264         if (data->sensorsp & SEL_PLACE) {
 265                 err = device_create_file(&pdev->dev,
 266                                    &sensor_dev_attr_temp2_input.dev_attr);
 267                 if (err)
 268                         goto exit_remove;
 269         }
 270
 271         /* core can be changed and reports something */
 272         if (data->sensorsp & SEL_CORE) {
 273                 err = device_create_file(&pdev->dev,
 274                                    &sensor_dev_attr_temp3_input.dev_attr);
 275                 if (err)
 276                         goto exit_remove;
 277                 if (data->sensorsp & SEL_PLACE) {
 278                         err = device_create_file(&pdev->dev,
 279                                            &sensor_dev_attr_temp4_input.
 280                                            dev_attr);
 281                         if (err)
 282                                 goto exit_remove;
 283                 }
 284         }
 285
 286         err = device_create_file(&pdev->dev, &dev_attr_name);
 287         if (err)
 288                 goto exit_remove;
 289
 290         data->hwmon_dev = hwmon_device_register(&pdev->dev);
 291
 292         if (IS_ERR(data->hwmon_dev)) {
 293                 err = PTR_ERR(data->hwmon_dev);
 294                 goto exit_remove;
 295         }
 296
 297         return 0;
 298
 299 exit_remove:
 300         device_remove_file(&pdev->dev,
 301                            &sensor_dev_attr_temp1_input.dev_attr);
 302         device_remove_file(&pdev->dev,
 303                            &sensor_dev_attr_temp2_input.dev_attr);
 304         device_remove_file(&pdev->dev,
 305                            &sensor_dev_attr_temp3_input.dev_attr);
 306         device_remove_file(&pdev->dev,
 307                            &sensor_dev_attr_temp4_input.dev_attr);
 308         device_remove_file(&pdev->dev, &dev_attr_name);
 309 exit_free:
 310         dev_set_drvdata(&pdev->dev, NULL);
 311         kfree(data);
 312 exit:
 313         return err;
 314 }
 315
 316 static void __devexit k8temp_remove(struct pci_dev *pdev)
 317 {
 318         struct k8temp_data *data = dev_get_drvdata(&pdev->dev);
 319
 320         hwmon_device_unregister(data->hwmon_dev);
 321         device_remove_file(&pdev->dev,
 322                            &sensor_dev_attr_temp1_input.dev_attr);
 323         device_remove_file(&pdev->dev,
 324                            &sensor_dev_attr_temp2_input.dev_attr);
 325         device_remove_file(&pdev->dev,
 326                            &sensor_dev_attr_temp3_input.dev_attr);
 327         device_remove_file(&pdev->dev,
 328                            &sensor_dev_attr_temp4_input.dev_attr);
 329         device_remove_file(&pdev->dev, &dev_attr_name);
 330         dev_set_drvdata(&pdev->dev, NULL);
 331         kfree(data);
 332 }
 333
 334 static struct pci_driver k8temp_driver = {
 335         .name = "k8temp",
 336         .id_table = k8temp_ids,
 337         .probe = k8temp_probe,
 338         .remove = __devexit_p(k8temp_remove),
 339 };
 340
 341 static int __init k8temp_init(void)
 342 {
 343         return pci_register_driver(&k8temp_driver);
 344 }
 345
 346 static void __exit k8temp_exit(void)
 347 {
 348         pci_unregister_driver(&k8temp_driver);
 349 }
 350
 351 MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>");
 352 MODULE_DESCRIPTION("AMD K8 core temperature monitor");
 353 MODULE_LICENSE("GPL");
 354
 355 module_init(k8temp_init)
 356 module_exit(k8temp_exit)