LXR 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/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
  41struct 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
  55static 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
 104static 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
 113static 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
 133static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, 0);
 134static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 0, 1);
 135static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp, NULL, 1, 0);
 136static SENSOR_DEVICE_ATTR_2(temp4_input, S_IRUGO, show_temp, NULL, 1, 1);
 137static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
 138
 139static 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
 144MODULE_DEVICE_TABLE(pci, k8temp_ids);
 145
 146static 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
 177static 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
 299exit_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);
 309exit_free:
 310        dev_set_drvdata(&pdev->dev, NULL);
 311        kfree(data);
 312exit:
 313        return err;
 314}
 315
 316static 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
 334static 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
 341static int __init k8temp_init(void)
 342{
 343        return pci_register_driver(&k8temp_driver);
 344}
 345
 346static void __exit k8temp_exit(void)
 347{
 348        pci_unregister_driver(&k8temp_driver);
 349}
 350
 351MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>");
 352MODULE_DESCRIPTION("AMD K8 core temperature monitor");
 353MODULE_LICENSE("GPL");
 354
 355module_init(k8temp_init)
 356module_exit(k8temp_exit)
 357