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   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)
 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 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 k8temp_probe(struct pci_dev *pdev,
 147                                   const struct pci_device_id *id)
 148 {
 149         int err;
 150         u8 scfg;
 151         u32 temp;
 152         u8 model, stepping;
 153         struct k8temp_data *data;
 154
 155         if (!(data = kzalloc(sizeof(struct k8temp_data), GFP_KERNEL))) {
 156                 err = -ENOMEM;
 157                 goto exit;
 158         }
 159
 160         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
 172                 /*
 173                  * AMD NPT family 0fh, i.e. RevF and RevG:
 174                  * meaning of SEL_CORE bit is inverted
 175                  */
 176                 if (model >= 0x40) {
 177                         data->swap_core_select = 1;
 178                         dev_warn(&pdev->dev, "Temperature readouts might be "
 179                                  "wrong - check erratum #141\n");
 180                 }
 181
 182                 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
 192                 break;
 193         }
 194
 195         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
 265         data->hwmon_dev = hwmon_device_register(&pdev->dev);
 266
 267         if (IS_ERR(data->hwmon_dev)) {
 268                 err = PTR_ERR(data->hwmon_dev);
 269                 goto exit_remove;
 270         }
 271
 272         return 0;
 273
 274 exit_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);
 284 exit_free:
 285         dev_set_drvdata(&pdev->dev, NULL);
 286         kfree(data);
 287 exit:
 288         return err;
 289 }
 290
 291 static void __devexit k8temp_remove(struct pci_dev *pdev)
 292 {
 293         struct k8temp_data *data = dev_get_drvdata(&pdev->dev);
 294
 295         hwmon_device_unregister(data->hwmon_dev);
 296         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
 309 static 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
 316 static int __init k8temp_init(void)
 317 {
 318         return pci_register_driver(&k8temp_driver);
 319 }
 320
 321 static void __exit k8temp_exit(void)
 322 {
 323         pci_unregister_driver(&k8temp_driver);
 324 }
 325
 326 MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>");
 327 MODULE_DESCRIPTION("AMD K8 core temperature monitor");
 328 MODULE_LICENSE("GPL");
 329
 330 module_init(k8temp_init)
 331 module_exit(k8temp_exit)