linux/drivers/hwmon/k8temp.c
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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/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
  40struct 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
  54static 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
 103static 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
 112static 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
 132static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, 0);
 133static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 0, 1);
 134static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp, NULL, 1, 0);
 135static SENSOR_DEVICE_ATTR_2(temp4_input, S_IRUGO, show_temp, NULL, 1, 1);
 136static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
 137
 138static DEFINE_PCI_DEVICE_TABLE(k8temp_ids) = {
 139        { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB_MISC) },
 140        { 0 },
 141};
 142
 143MODULE_DEVICE_TABLE(pci, k8temp_ids);
 144
 145static 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
 176static 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
 294exit_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
 307static 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
 323static 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
 330module_pci_driver(k8temp_driver);
 331
 332MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>");
 333MODULE_DESCRIPTION("AMD K8 core temperature monitor");
 334MODULE_LICENSE("GPL");
 335
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