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) 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 struct pci_device_id 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 k8temp_probe(struct pci_dev *pdev, 147 const struct pci_device_id *id) 148 { 149 int err; 150 u8 scfg; 151 u32 temp; 152 u8 model, stepping; 153 struct k8temp_data *data; 154 155 if (!(data = kzalloc(sizeof(struct k8temp_data), GFP_KERNEL))) { 156 err = -ENOMEM; 157 goto exit; 158 } 159 160 model = boot_cpu_data.x86_model; 161 stepping = boot_cpu_data.x86_mask; 162 163 switch (boot_cpu_data.x86) { 164 case 0xf: 165 /* feature available since SH-C0, exclude older revisions */ 166 if (((model == 4) && (stepping == 0)) || 167 ((model == 5) && (stepping <= 1))) { 168 err = -ENODEV; 169 goto exit_free; 170 } 171 172 /* 173 * AMD NPT family 0fh, i.e. RevF and RevG: 174 * meaning of SEL_CORE bit is inverted 175 */ 176 if (model >= 0x40) { 177 data->swap_core_select = 1; 178 dev_warn(&pdev->dev, "Temperature readouts might be " 179 "wrong - check erratum #141\n"); 180 } 181 182 if ((model >= 0x69) && 183 !(model == 0xc1 || model == 0x6c || model == 0x7c)) { 184 /* 185 * RevG desktop CPUs (i.e. no socket S1G1 parts) 186 * need additional offset, otherwise reported 187 * temperature is below ambient temperature 188 */ 189 data->temp_offset = 21000; 190 } 191 192 break; 193 } 194 195 pci_read_config_byte(pdev, REG_TEMP, &scfg); 196 scfg &= ~(SEL_PLACE | SEL_CORE); /* Select sensor 0, core0 */ 197 pci_write_config_byte(pdev, REG_TEMP, scfg); 198 pci_read_config_byte(pdev, REG_TEMP, &scfg); 199 200 if (scfg & (SEL_PLACE | SEL_CORE)) { 201 dev_err(&pdev->dev, "Configuration bit(s) stuck at 1!\n"); 202 err = -ENODEV; 203 goto exit_free; 204 } 205 206 scfg |= (SEL_PLACE | SEL_CORE); 207 pci_write_config_byte(pdev, REG_TEMP, scfg); 208 209 /* now we know if we can change core and/or sensor */ 210 pci_read_config_byte(pdev, REG_TEMP, &data->sensorsp); 211 212 if (data->sensorsp & SEL_PLACE) { 213 scfg &= ~SEL_CORE; /* Select sensor 1, core0 */ 214 pci_write_config_byte(pdev, REG_TEMP, scfg); 215 pci_read_config_dword(pdev, REG_TEMP, &temp); 216 scfg |= SEL_CORE; /* prepare for next selection */ 217 if (!((temp >> 16) & 0xff)) /* if temp is 0 -49C is not likely */ 218 data->sensorsp &= ~SEL_PLACE; 219 } 220 221 if (data->sensorsp & SEL_CORE) { 222 scfg &= ~SEL_PLACE; /* Select sensor 0, core1 */ 223 pci_write_config_byte(pdev, REG_TEMP, scfg); 224 pci_read_config_dword(pdev, REG_TEMP, &temp); 225 if (!((temp >> 16) & 0xff)) /* if temp is 0 -49C is not likely */ 226 data->sensorsp &= ~SEL_CORE; 227 } 228 229 data->name = "k8temp"; 230 mutex_init(&data->update_lock); 231 dev_set_drvdata(&pdev->dev, data); 232 233 /* Register sysfs hooks */ 234 err = device_create_file(&pdev->dev, 235 &sensor_dev_attr_temp1_input.dev_attr); 236 if (err) 237 goto exit_remove; 238 239 /* sensor can be changed and reports something */ 240 if (data->sensorsp & SEL_PLACE) { 241 err = device_create_file(&pdev->dev, 242 &sensor_dev_attr_temp2_input.dev_attr); 243 if (err) 244 goto exit_remove; 245 } 246 247 /* core can be changed and reports something */ 248 if (data->sensorsp & SEL_CORE) { 249 err = device_create_file(&pdev->dev, 250 &sensor_dev_attr_temp3_input.dev_attr); 251 if (err) 252 goto exit_remove; 253 if (data->sensorsp & SEL_PLACE) 254 err = device_create_file(&pdev->dev, 255 &sensor_dev_attr_temp4_input. 256 dev_attr); 257 if (err) 258 goto exit_remove; 259 } 260 261 err = device_create_file(&pdev->dev, &dev_attr_name); 262 if (err) 263 goto exit_remove; 264 265 data->hwmon_dev = hwmon_device_register(&pdev->dev); 266 267 if (IS_ERR(data->hwmon_dev)) { 268 err = PTR_ERR(data->hwmon_dev); 269 goto exit_remove; 270 } 271 272 return 0; 273 274 exit_remove: 275 device_remove_file(&pdev->dev, 276 &sensor_dev_attr_temp1_input.dev_attr); 277 device_remove_file(&pdev->dev, 278 &sensor_dev_attr_temp2_input.dev_attr); 279 device_remove_file(&pdev->dev, 280 &sensor_dev_attr_temp3_input.dev_attr); 281 device_remove_file(&pdev->dev, 282 &sensor_dev_attr_temp4_input.dev_attr); 283 device_remove_file(&pdev->dev, &dev_attr_name); 284 exit_free: 285 dev_set_drvdata(&pdev->dev, NULL); 286 kfree(data); 287 exit: 288 return err; 289 } 290 291 static void __devexit k8temp_remove(struct pci_dev *pdev) 292 { 293 struct k8temp_data *data = dev_get_drvdata(&pdev->dev); 294 295 hwmon_device_unregister(data->hwmon_dev); 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 dev_set_drvdata(&pdev->dev, NULL); 306 kfree(data); 307 } 308 309 static struct pci_driver k8temp_driver = { 310 .name = "k8temp", 311 .id_table = k8temp_ids, 312 .probe = k8temp_probe, 313 .remove = __devexit_p(k8temp_remove), 314 }; 315 316 static int __init k8temp_init(void) 317 { 318 return pci_register_driver(&k8temp_driver); 319 } 320 321 static void __exit k8temp_exit(void) 322 { 323 pci_unregister_driver(&k8temp_driver); 324 } 325 326 MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>"); 327 MODULE_DESCRIPTION("AMD K8 core temperature monitor"); 328 MODULE_LICENSE("GPL"); 329 330 module_init(k8temp_init) 331 module_exit(k8temp_exit) 332