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 && (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 */ 132 133 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 DEFINE_PCI_DEVICE_TABLE(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 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 } 176 177 static 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 = kzalloc(sizeof(struct k8temp_data), GFP_KERNEL); 187 if (!data) { 188 err = -ENOMEM; 189 goto exit; 190 } 191 192 model = boot_cpu_data.x86_model; 193 stepping = boot_cpu_data.x86_mask; 194 195 /* feature available since SH-C0, exclude older revisions */ 196 if (((model == 4) && (stepping == 0)) || 197 ((model == 5) && (stepping <= 1))) { 198 err = -ENODEV; 199 goto exit_free; 200 } 201 202 /* 203 * AMD NPT family 0fh, i.e. RevF and RevG: 204 * meaning of SEL_CORE bit is inverted 205 */ 206 if (model >= 0x40) { 207 data->swap_core_select = 1; 208 dev_warn(&pdev->dev, "Temperature readouts might be wrong - " 209 "check erratum #141\n"); 210 } 211 212 /* 213 * RevG desktop CPUs (i.e. no socket S1G1 or ASB1 parts) need 214 * additional offset, otherwise reported temperature is below 215 * ambient temperature 216 */ 217 if (is_rev_g_desktop(model)) 218 data->temp_offset = 21000; 219 220 pci_read_config_byte(pdev, REG_TEMP, &scfg); 221 scfg &= ~(SEL_PLACE | SEL_CORE); /* Select sensor 0, core0 */ 222 pci_write_config_byte(pdev, REG_TEMP, scfg); 223 pci_read_config_byte(pdev, REG_TEMP, &scfg); 224 225 if (scfg & (SEL_PLACE | SEL_CORE)) { 226 dev_err(&pdev->dev, "Configuration bit(s) stuck at 1!\n"); 227 err = -ENODEV; 228 goto exit_free; 229 } 230 231 scfg |= (SEL_PLACE | SEL_CORE); 232 pci_write_config_byte(pdev, REG_TEMP, scfg); 233 234 /* now we know if we can change core and/or sensor */ 235 pci_read_config_byte(pdev, REG_TEMP, &data->sensorsp); 236 237 if (data->sensorsp & SEL_PLACE) { 238 scfg &= ~SEL_CORE; /* Select sensor 1, core0 */ 239 pci_write_config_byte(pdev, REG_TEMP, scfg); 240 pci_read_config_dword(pdev, REG_TEMP, &temp); 241 scfg |= SEL_CORE; /* prepare for next selection */ 242 if (!((temp >> 16) & 0xff)) /* if temp is 0 -49C is unlikely */ 243 data->sensorsp &= ~SEL_PLACE; 244 } 245 246 if (data->sensorsp & SEL_CORE) { 247 scfg &= ~SEL_PLACE; /* Select sensor 0, core1 */ 248 pci_write_config_byte(pdev, REG_TEMP, scfg); 249 pci_read_config_dword(pdev, REG_TEMP, &temp); 250 if (!((temp >> 16) & 0xff)) /* if temp is 0 -49C is unlikely */ 251 data->sensorsp &= ~SEL_CORE; 252 } 253 254 data->name = "k8temp"; 255 mutex_init(&data->update_lock); 256 pci_set_drvdata(pdev, data); 257 258 /* Register sysfs hooks */ 259 err = device_create_file(&pdev->dev, 260 &sensor_dev_attr_temp1_input.dev_attr); 261 if (err) 262 goto exit_remove; 263 264 /* sensor can be changed and reports something */ 265 if (data->sensorsp & SEL_PLACE) { 266 err = device_create_file(&pdev->dev, 267 &sensor_dev_attr_temp2_input.dev_attr); 268 if (err) 269 goto exit_remove; 270 } 271 272 /* core can be changed and reports something */ 273 if (data->sensorsp & SEL_CORE) { 274 err = device_create_file(&pdev->dev, 275 &sensor_dev_attr_temp3_input.dev_attr); 276 if (err) 277 goto exit_remove; 278 if (data->sensorsp & SEL_PLACE) { 279 err = device_create_file(&pdev->dev, 280 &sensor_dev_attr_temp4_input. 281 dev_attr); 282 if (err) 283 goto exit_remove; 284 } 285 } 286 287 err = device_create_file(&pdev->dev, &dev_attr_name); 288 if (err) 289 goto exit_remove; 290 291 data->hwmon_dev = hwmon_device_register(&pdev->dev); 292 293 if (IS_ERR(data->hwmon_dev)) { 294 err = PTR_ERR(data->hwmon_dev); 295 goto exit_remove; 296 } 297 298 return 0; 299 300 exit_remove: 301 device_remove_file(&pdev->dev, 302 &sensor_dev_attr_temp1_input.dev_attr); 303 device_remove_file(&pdev->dev, 304 &sensor_dev_attr_temp2_input.dev_attr); 305 device_remove_file(&pdev->dev, 306 &sensor_dev_attr_temp3_input.dev_attr); 307 device_remove_file(&pdev->dev, 308 &sensor_dev_attr_temp4_input.dev_attr); 309 device_remove_file(&pdev->dev, &dev_attr_name); 310 exit_free: 311 pci_set_drvdata(pdev, NULL); 312 kfree(data); 313 exit: 314 return err; 315 } 316 317 static void __devexit k8temp_remove(struct pci_dev *pdev) 318 { 319 struct k8temp_data *data = pci_get_drvdata(pdev); 320 321 hwmon_device_unregister(data->hwmon_dev); 322 device_remove_file(&pdev->dev, 323 &sensor_dev_attr_temp1_input.dev_attr); 324 device_remove_file(&pdev->dev, 325 &sensor_dev_attr_temp2_input.dev_attr); 326 device_remove_file(&pdev->dev, 327 &sensor_dev_attr_temp3_input.dev_attr); 328 device_remove_file(&pdev->dev, 329 &sensor_dev_attr_temp4_input.dev_attr); 330 device_remove_file(&pdev->dev, &dev_attr_name); 331 pci_set_drvdata(pdev, NULL); 332 kfree(data); 333 } 334 335 static struct pci_driver k8temp_driver = { 336 .name = "k8temp", 337 .id_table = k8temp_ids, 338 .probe = k8temp_probe, 339 .remove = __devexit_p(k8temp_remove), 340 }; 341 342 static int __init k8temp_init(void) 343 { 344 return pci_register_driver(&k8temp_driver); 345 } 346 347 static void __exit k8temp_exit(void) 348 { 349 pci_unregister_driver(&k8temp_driver); 350 } 351 352 MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>"); 353 MODULE_DESCRIPTION("AMD K8 core temperature monitor"); 354 MODULE_LICENSE("GPL"); 355 356 module_init(k8temp_init) 357 module_exit(k8temp_exit) 358