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 switch (boot_cpu_data.x86) { 195 case 0xf: 196 /* feature available since SH-C0, exclude older revisions */ 197 if (((model == 4) && (stepping == 0)) || 198 ((model == 5) && (stepping <= 1))) { 199 err = -ENODEV; 200 goto exit_free; 201 } 202 203 /* 204 * AMD NPT family 0fh, i.e. RevF and RevG: 205 * meaning of SEL_CORE bit is inverted 206 */ 207 if (model >= 0x40) { 208 data->swap_core_select = 1; 209 dev_warn(&pdev->dev, "Temperature readouts might be " 210 "wrong - check erratum #141\n"); 211 } 212 213 if (is_rev_g_desktop(model)) { 214 /* 215 * RevG desktop CPUs (i.e. no socket S1G1 or 216 * ASB1 parts) need additional offset, 217 * otherwise reported temperature is below 218 * ambient temperature 219 */ 220 data->temp_offset = 21000; 221 } 222 223 break; 224 } 225 226 pci_read_config_byte(pdev, REG_TEMP, &scfg); 227 scfg &= ~(SEL_PLACE | SEL_CORE); /* Select sensor 0, core0 */ 228 pci_write_config_byte(pdev, REG_TEMP, scfg); 229 pci_read_config_byte(pdev, REG_TEMP, &scfg); 230 231 if (scfg & (SEL_PLACE | SEL_CORE)) { 232 dev_err(&pdev->dev, "Configuration bit(s) stuck at 1!\n"); 233 err = -ENODEV; 234 goto exit_free; 235 } 236 237 scfg |= (SEL_PLACE | SEL_CORE); 238 pci_write_config_byte(pdev, REG_TEMP, scfg); 239 240 /* now we know if we can change core and/or sensor */ 241 pci_read_config_byte(pdev, REG_TEMP, &data->sensorsp); 242 243 if (data->sensorsp & SEL_PLACE) { 244 scfg &= ~SEL_CORE; /* Select sensor 1, core0 */ 245 pci_write_config_byte(pdev, REG_TEMP, scfg); 246 pci_read_config_dword(pdev, REG_TEMP, &temp); 247 scfg |= SEL_CORE; /* prepare for next selection */ 248 if (!((temp >> 16) & 0xff)) /* if temp is 0 -49C is not likely */ 249 data->sensorsp &= ~SEL_PLACE; 250 } 251 252 if (data->sensorsp & SEL_CORE) { 253 scfg &= ~SEL_PLACE; /* Select sensor 0, core1 */ 254 pci_write_config_byte(pdev, REG_TEMP, scfg); 255 pci_read_config_dword(pdev, REG_TEMP, &temp); 256 if (!((temp >> 16) & 0xff)) /* if temp is 0 -49C is not likely */ 257 data->sensorsp &= ~SEL_CORE; 258 } 259 260 data->name = "k8temp"; 261 mutex_init(&data->update_lock); 262 dev_set_drvdata(&pdev->dev, data); 263 264 /* Register sysfs hooks */ 265 err = device_create_file(&pdev->dev, 266 &sensor_dev_attr_temp1_input.dev_attr); 267 if (err) 268 goto exit_remove; 269 270 /* sensor can be changed and reports something */ 271 if (data->sensorsp & SEL_PLACE) { 272 err = device_create_file(&pdev->dev, 273 &sensor_dev_attr_temp2_input.dev_attr); 274 if (err) 275 goto exit_remove; 276 } 277 278 /* core can be changed and reports something */ 279 if (data->sensorsp & SEL_CORE) { 280 err = device_create_file(&pdev->dev, 281 &sensor_dev_attr_temp3_input.dev_attr); 282 if (err) 283 goto exit_remove; 284 if (data->sensorsp & SEL_PLACE) { 285 err = device_create_file(&pdev->dev, 286 &sensor_dev_attr_temp4_input. 287 dev_attr); 288 if (err) 289 goto exit_remove; 290 } 291 } 292 293 err = device_create_file(&pdev->dev, &dev_attr_name); 294 if (err) 295 goto exit_remove; 296 297 data->hwmon_dev = hwmon_device_register(&pdev->dev); 298 299 if (IS_ERR(data->hwmon_dev)) { 300 err = PTR_ERR(data->hwmon_dev); 301 goto exit_remove; 302 } 303 304 return 0; 305 306exit_remove: 307 device_remove_file(&pdev->dev, 308 &sensor_dev_attr_temp1_input.dev_attr); 309 device_remove_file(&pdev->dev, 310 &sensor_dev_attr_temp2_input.dev_attr); 311 device_remove_file(&pdev->dev, 312 &sensor_dev_attr_temp3_input.dev_attr); 313 device_remove_file(&pdev->dev, 314 &sensor_dev_attr_temp4_input.dev_attr); 315 device_remove_file(&pdev->dev, &dev_attr_name); 316exit_free: 317 dev_set_drvdata(&pdev->dev, NULL); 318 kfree(data); 319exit: 320 return err; 321} 322 323static void __devexit k8temp_remove(struct pci_dev *pdev) 324{ 325 struct k8temp_data *data = dev_get_drvdata(&pdev->dev); 326 327 hwmon_device_unregister(data->hwmon_dev); 328 device_remove_file(&pdev->dev, 329 &sensor_dev_attr_temp1_input.dev_attr); 330 device_remove_file(&pdev->dev, 331 &sensor_dev_attr_temp2_input.dev_attr); 332 device_remove_file(&pdev->dev, 333 &sensor_dev_attr_temp3_input.dev_attr); 334 device_remove_file(&pdev->dev, 335 &sensor_dev_attr_temp4_input.dev_attr); 336 device_remove_file(&pdev->dev, &dev_attr_name); 337 dev_set_drvdata(&pdev->dev, NULL); 338 kfree(data); 339} 340 341static struct pci_driver k8temp_driver = { 342 .name = "k8temp", 343 .id_table = k8temp_ids, 344 .probe = k8temp_probe, 345 .remove = __devexit_p(k8temp_remove), 346}; 347 348static int __init k8temp_init(void) 349{ 350 return pci_register_driver(&k8temp_driver); 351} 352 353static void __exit k8temp_exit(void) 354{ 355 pci_unregister_driver(&k8temp_driver); 356} 357 358MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>"); 359MODULE_DESCRIPTION("AMD K8 core temperature monitor"); 360MODULE_LICENSE("GPL"); 361 362module_init(k8temp_init) 363module_exit(k8temp_exit) 364