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/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 DEFINE_PCI_DEVICE_TABLE(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        data = devm_kzalloc(&pdev->dev, sizeof(struct k8temp_data), GFP_KERNEL);
 187        if (!data)
 188                return -ENOMEM;
 189
 190        model = boot_cpu_data.x86_model;
 191        stepping = boot_cpu_data.x86_mask;
 192
 193        /* feature available since SH-C0, exclude older revisions */
 194        if ((model == 4 && stepping == 0) ||
 195            (model == 5 && stepping <= 1))
 196                return -ENODEV;
 197
 198        /*
 199         * AMD NPT family 0fh, i.e. RevF and RevG:
 200         * meaning of SEL_CORE bit is inverted
 201         */
 202        if (model >= 0x40) {
 203                data->swap_core_select = 1;
 204                dev_warn(&pdev->dev, "Temperature readouts might be wrong - "
 205                         "check erratum #141\n");
 206        }
 207
 208        /*
 209         * RevG desktop CPUs (i.e. no socket S1G1 or ASB1 parts) need
 210         * additional offset, otherwise reported temperature is below
 211         * ambient temperature
 212         */
 213        if (is_rev_g_desktop(model))
 214                data->temp_offset = 21000;
 215
 216        pci_read_config_byte(pdev, REG_TEMP, &scfg);
 217        scfg &= ~(SEL_PLACE | SEL_CORE);        /* Select sensor 0, core0 */
 218        pci_write_config_byte(pdev, REG_TEMP, scfg);
 219        pci_read_config_byte(pdev, REG_TEMP, &scfg);
 220
 221        if (scfg & (SEL_PLACE | SEL_CORE)) {
 222                dev_err(&pdev->dev, "Configuration bit(s) stuck at 1!\n");
 223                return -ENODEV;
 224        }
 225
 226        scfg |= (SEL_PLACE | SEL_CORE);
 227        pci_write_config_byte(pdev, REG_TEMP, scfg);
 228
 229        /* now we know if we can change core and/or sensor */
 230        pci_read_config_byte(pdev, REG_TEMP, &data->sensorsp);
 231
 232        if (data->sensorsp & SEL_PLACE) {
 233                scfg &= ~SEL_CORE;      /* Select sensor 1, core0 */
 234                pci_write_config_byte(pdev, REG_TEMP, scfg);
 235                pci_read_config_dword(pdev, REG_TEMP, &temp);
 236                scfg |= SEL_CORE;       /* prepare for next selection */
 237                if (!((temp >> 16) & 0xff)) /* if temp is 0 -49C is unlikely */
 238                        data->sensorsp &= ~SEL_PLACE;
 239        }
 240
 241        if (data->sensorsp & SEL_CORE) {
 242                scfg &= ~SEL_PLACE;     /* Select sensor 0, core1 */
 243                pci_write_config_byte(pdev, REG_TEMP, scfg);
 244                pci_read_config_dword(pdev, REG_TEMP, &temp);
 245                if (!((temp >> 16) & 0xff)) /* if temp is 0 -49C is unlikely */
 246                        data->sensorsp &= ~SEL_CORE;
 247        }
 248
 249        data->name = "k8temp";
 250        mutex_init(&data->update_lock);
 251        pci_set_drvdata(pdev, data);
 252
 253        /* Register sysfs hooks */
 254        err = device_create_file(&pdev->dev,
 255                           &sensor_dev_attr_temp1_input.dev_attr);
 256        if (err)
 257                goto exit_remove;
 258
 259        /* sensor can be changed and reports something */
 260        if (data->sensorsp & SEL_PLACE) {
 261                err = device_create_file(&pdev->dev,
 262                                   &sensor_dev_attr_temp2_input.dev_attr);
 263                if (err)
 264                        goto exit_remove;
 265        }
 266
 267        /* core can be changed and reports something */
 268        if (data->sensorsp & SEL_CORE) {
 269                err = device_create_file(&pdev->dev,
 270                                   &sensor_dev_attr_temp3_input.dev_attr);
 271                if (err)
 272                        goto exit_remove;
 273                if (data->sensorsp & SEL_PLACE) {
 274                        err = device_create_file(&pdev->dev,
 275                                           &sensor_dev_attr_temp4_input.
 276                                           dev_attr);
 277                        if (err)
 278                                goto exit_remove;
 279                }
 280        }
 281
 282        err = device_create_file(&pdev->dev, &dev_attr_name);
 283        if (err)
 284                goto exit_remove;
 285
 286        data->hwmon_dev = hwmon_device_register(&pdev->dev);
 287
 288        if (IS_ERR(data->hwmon_dev)) {
 289                err = PTR_ERR(data->hwmon_dev);
 290                goto exit_remove;
 291        }
 292
 293        return 0;
 294
 295exit_remove:
 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        return err;
 306}
 307
 308static void __devexit k8temp_remove(struct pci_dev *pdev)
 309{
 310        struct k8temp_data *data = pci_get_drvdata(pdev);
 311
 312        hwmon_device_unregister(data->hwmon_dev);
 313        device_remove_file(&pdev->dev,
 314                           &sensor_dev_attr_temp1_input.dev_attr);
 315        device_remove_file(&pdev->dev,
 316                           &sensor_dev_attr_temp2_input.dev_attr);
 317        device_remove_file(&pdev->dev,
 318                           &sensor_dev_attr_temp3_input.dev_attr);
 319        device_remove_file(&pdev->dev,
 320                           &sensor_dev_attr_temp4_input.dev_attr);
 321        device_remove_file(&pdev->dev, &dev_attr_name);
 322}
 323
 324static struct pci_driver k8temp_driver = {
 325        .name = "k8temp",
 326        .id_table = k8temp_ids,
 327        .probe = k8temp_probe,
 328        .remove = __devexit_p(k8temp_remove),
 329};
 330
 331module_pci_driver(k8temp_driver);
 332
 333MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>");
 334MODULE_DESCRIPTION("AMD K8 core temperature monitor");
 335MODULE_LICENSE("GPL");
 336
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