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 40 struct 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 54 static 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 */ 102 103 static ssize_t name_show(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 } 110 111 112 static ssize_t temp_show(struct device *dev, struct device_attribute *devattr, 113 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 */ 131 132 static SENSOR_DEVICE_ATTR_2_RO(temp1_input, temp, 0, 0); 133 static SENSOR_DEVICE_ATTR_2_RO(temp2_input, temp, 0, 1); 134 static SENSOR_DEVICE_ATTR_2_RO(temp3_input, temp, 1, 0); 135 static SENSOR_DEVICE_ATTR_2_RO(temp4_input, temp, 1, 1); 136 static DEVICE_ATTR_RO(name); 137 138 static const struct pci_device_id k8temp_ids[] = { 139 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB_MISC) }, 140 { 0 }, 141 }; 142 143 MODULE_DEVICE_TABLE(pci, k8temp_ids); 144 145 static int 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 } 175 176 static int 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_stepping; 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, 204 "Temperature readouts might be wrong - 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; 293 294 exit_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 } 306 307 static void 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 } 322 323 static struct pci_driver k8temp_driver = { 324 .name = "k8temp", 325 .id_table = k8temp_ids, 326 .probe = k8temp_probe, 327 .remove = k8temp_remove, 328 }; 329 330 module_pci_driver(k8temp_driver); 331 332 MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>"); 333 MODULE_DESCRIPTION("AMD K8 core temperature monitor"); 334 MODULE_LICENSE("GPL"); 335