| /* |
| * 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 DEFINE_PCI_DEVICE_TABLE(k8temp_ids) = { |
| { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB_MISC) }, |
| { 0 }, |
| }; |
| |
| MODULE_DEVICE_TABLE(pci, k8temp_ids); |
| |
| static int __devinit 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 __devinit 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 __devexit 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"); |