/* * k8temp.c - Linux kernel module for hardware monitoring * * Copyright (C) 2006 Rudolf Marek <r.marek@assembler.cz> * * Inspired from the w83785 and amd756 drivers. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA * 02110-1301 USA. */ #include <linux/module.h> #include <linux/init.h> #include <linux/slab.h> #include <linux/jiffies.h> #include <linux/pci.h> #include <linux/hwmon.h> #include <linux/hwmon-sysfs.h> #include <linux/err.h> #include <linux/mutex.h> #include <asm/processor.h> #define TEMP_FROM_REG(val) (((((val) >> 16) & 0xff) - 49) * 1000) #define REG_TEMP 0xe4 #define SEL_PLACE 0x40 #define SEL_CORE 0x04 struct k8temp_data { struct device *hwmon_dev; struct mutex update_lock; const char *name; char valid; /* zero until following fields are valid */ unsigned long last_updated; /* in jiffies */ /* registers values */ u8 sensorsp; /* sensor presence bits - SEL_CORE, SEL_PLACE */ u32 temp[2][2]; /* core, place */ u8 swap_core_select; /* meaning of SEL_CORE is inverted */ u32 temp_offset; }; static struct k8temp_data *k8temp_update_device(struct device *dev) { struct k8temp_data *data = dev_get_drvdata(dev); struct pci_dev *pdev = to_pci_dev(dev); u8 tmp; mutex_lock(&data->update_lock); if (!data->valid || time_after(jiffies, data->last_updated + HZ)) { pci_read_config_byte(pdev, REG_TEMP, &tmp); tmp &= ~(SEL_PLACE | SEL_CORE); /* Select sensor 0, core0 */ pci_write_config_byte(pdev, REG_TEMP, tmp); pci_read_config_dword(pdev, REG_TEMP, &data->temp[0][0]); if (data->sensorsp & SEL_PLACE) { tmp |= SEL_PLACE; /* Select sensor 1, core0 */ pci_write_config_byte(pdev, REG_TEMP, tmp); pci_read_config_dword(pdev, REG_TEMP, &data->temp[0][1]); } if (data->sensorsp & SEL_CORE) { tmp &= ~SEL_PLACE; /* Select sensor 0, core1 */ tmp |= SEL_CORE; pci_write_config_byte(pdev, REG_TEMP, tmp); pci_read_config_dword(pdev, REG_TEMP, &data->temp[1][0]); if (data->sensorsp & SEL_PLACE) { tmp |= SEL_PLACE; /* Select sensor 1, core1 */ pci_write_config_byte(pdev, REG_TEMP, tmp); pci_read_config_dword(pdev, REG_TEMP, &data->temp[1][1]); } } data->last_updated = jiffies; data->valid = 1; } mutex_unlock(&data->update_lock); return data; } /* * Sysfs stuff */ static ssize_t show_name(struct device *dev, struct device_attribute *devattr, char *buf) { struct k8temp_data *data = dev_get_drvdata(dev); return sprintf(buf, "%s\n", data->name); } static ssize_t show_temp(struct device *dev, struct device_attribute *devattr, char *buf) { struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(devattr); int core = attr->nr; int place = attr->index; int temp; struct k8temp_data *data = k8temp_update_device(dev); if (data->swap_core_select && (data->sensorsp & SEL_CORE)) core = core ? 0 : 1; temp = TEMP_FROM_REG(data->temp[core][place]) + data->temp_offset; return sprintf(buf, "%d\n", temp); } /* core, place */ static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, 0); static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 0, 1); static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp, NULL, 1, 0); static SENSOR_DEVICE_ATTR_2(temp4_input, S_IRUGO, show_temp, NULL, 1, 1); static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); static const struct pci_device_id k8temp_ids[] = { { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB_MISC) }, { 0 }, }; MODULE_DEVICE_TABLE(pci, k8temp_ids); static int is_rev_g_desktop(u8 model) { u32 brandidx; if (model < 0x69) return 0; if (model == 0xc1 || model == 0x6c || model == 0x7c) return 0; /* * Differentiate between AM2 and ASB1. * See "Constructing the processor Name String" in "Revision * Guide for AMD NPT Family 0Fh Processors" (33610). */ brandidx = cpuid_ebx(0x80000001); brandidx = (brandidx >> 9) & 0x1f; /* Single core */ if ((model == 0x6f || model == 0x7f) && (brandidx == 0x7 || brandidx == 0x9 || brandidx == 0xc)) return 0; /* Dual core */ if (model == 0x6b && (brandidx == 0xb || brandidx == 0xc)) return 0; return 1; } static int k8temp_probe(struct pci_dev *pdev, const struct pci_device_id *id) { int err; u8 scfg; u32 temp; u8 model, stepping; struct k8temp_data *data; data = devm_kzalloc(&pdev->dev, sizeof(struct k8temp_data), GFP_KERNEL); if (!data) return -ENOMEM; model = boot_cpu_data.x86_model; stepping = boot_cpu_data.x86_mask; /* feature available since SH-C0, exclude older revisions */ if ((model == 4 && stepping == 0) || (model == 5 && stepping <= 1)) return -ENODEV; /* * AMD NPT family 0fh, i.e. RevF and RevG: * meaning of SEL_CORE bit is inverted */ if (model >= 0x40) { data->swap_core_select = 1; dev_warn(&pdev->dev, "Temperature readouts might be wrong - check erratum #141\n"); } /* * RevG desktop CPUs (i.e. no socket S1G1 or ASB1 parts) need * additional offset, otherwise reported temperature is below * ambient temperature */ if (is_rev_g_desktop(model)) data->temp_offset = 21000; pci_read_config_byte(pdev, REG_TEMP, &scfg); scfg &= ~(SEL_PLACE | SEL_CORE); /* Select sensor 0, core0 */ pci_write_config_byte(pdev, REG_TEMP, scfg); pci_read_config_byte(pdev, REG_TEMP, &scfg); if (scfg & (SEL_PLACE | SEL_CORE)) { dev_err(&pdev->dev, "Configuration bit(s) stuck at 1!\n"); return -ENODEV; } scfg |= (SEL_PLACE | SEL_CORE); pci_write_config_byte(pdev, REG_TEMP, scfg); /* now we know if we can change core and/or sensor */ pci_read_config_byte(pdev, REG_TEMP, &data->sensorsp); if (data->sensorsp & SEL_PLACE) { scfg &= ~SEL_CORE; /* Select sensor 1, core0 */ pci_write_config_byte(pdev, REG_TEMP, scfg); pci_read_config_dword(pdev, REG_TEMP, &temp); scfg |= SEL_CORE; /* prepare for next selection */ if (!((temp >> 16) & 0xff)) /* if temp is 0 -49C is unlikely */ data->sensorsp &= ~SEL_PLACE; } if (data->sensorsp & SEL_CORE) { scfg &= ~SEL_PLACE; /* Select sensor 0, core1 */ pci_write_config_byte(pdev, REG_TEMP, scfg); pci_read_config_dword(pdev, REG_TEMP, &temp); if (!((temp >> 16) & 0xff)) /* if temp is 0 -49C is unlikely */ data->sensorsp &= ~SEL_CORE; } data->name = "k8temp"; mutex_init(&data->update_lock); pci_set_drvdata(pdev, data); /* Register sysfs hooks */ err = device_create_file(&pdev->dev, &sensor_dev_attr_temp1_input.dev_attr); if (err) goto exit_remove; /* sensor can be changed and reports something */ if (data->sensorsp & SEL_PLACE) { err = device_create_file(&pdev->dev, &sensor_dev_attr_temp2_input.dev_attr); if (err) goto exit_remove; } /* core can be changed and reports something */ if (data->sensorsp & SEL_CORE) { err = device_create_file(&pdev->dev, &sensor_dev_attr_temp3_input.dev_attr); if (err) goto exit_remove; if (data->sensorsp & SEL_PLACE) { err = device_create_file(&pdev->dev, &sensor_dev_attr_temp4_input. dev_attr); if (err) goto exit_remove; } } err = device_create_file(&pdev->dev, &dev_attr_name); if (err) goto exit_remove; data->hwmon_dev = hwmon_device_register(&pdev->dev); if (IS_ERR(data->hwmon_dev)) { err = PTR_ERR(data->hwmon_dev); goto exit_remove; } return 0; exit_remove: device_remove_file(&pdev->dev, &sensor_dev_attr_temp1_input.dev_attr); device_remove_file(&pdev->dev, &sensor_dev_attr_temp2_input.dev_attr); device_remove_file(&pdev->dev, &sensor_dev_attr_temp3_input.dev_attr); device_remove_file(&pdev->dev, &sensor_dev_attr_temp4_input.dev_attr); device_remove_file(&pdev->dev, &dev_attr_name); return err; } static void k8temp_remove(struct pci_dev *pdev) { struct k8temp_data *data = pci_get_drvdata(pdev); hwmon_device_unregister(data->hwmon_dev); device_remove_file(&pdev->dev, &sensor_dev_attr_temp1_input.dev_attr); device_remove_file(&pdev->dev, &sensor_dev_attr_temp2_input.dev_attr); device_remove_file(&pdev->dev, &sensor_dev_attr_temp3_input.dev_attr); device_remove_file(&pdev->dev, &sensor_dev_attr_temp4_input.dev_attr); device_remove_file(&pdev->dev, &dev_attr_name); } static struct pci_driver k8temp_driver = { .name = "k8temp", .id_table = k8temp_ids, .probe = k8temp_probe, .remove = k8temp_remove, }; module_pci_driver(k8temp_driver); MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>"); MODULE_DESCRIPTION("AMD K8 core temperature monitor"); MODULE_LICENSE("GPL");