diff options
| -rw-r--r-- | Documentation/hwmon/fam15h_power | 37 | ||||
| -rw-r--r-- | MAINTAINERS | 7 | ||||
| -rw-r--r-- | drivers/hwmon/Kconfig | 10 | ||||
| -rw-r--r-- | drivers/hwmon/Makefile | 1 | ||||
| -rw-r--r-- | drivers/hwmon/fam15h_power.c | 229 |
5 files changed, 284 insertions, 0 deletions
diff --git a/Documentation/hwmon/fam15h_power b/Documentation/hwmon/fam15h_power new file mode 100644 index 00000000000..a92918e0bd6 --- /dev/null +++ b/Documentation/hwmon/fam15h_power @@ -0,0 +1,37 @@ +Kernel driver fam15h_power +========================== + +Supported chips: +* AMD Family 15h Processors + + Prefix: 'fam15h_power' + Addresses scanned: PCI space + Datasheets: + BIOS and Kernel Developer's Guide (BKDG) For AMD Family 15h Processors + (not yet published) + +Author: Andreas Herrmann <andreas.herrmann3@amd.com> + +Description +----------- + +This driver permits reading of registers providing power information +of AMD Family 15h processors. + +For AMD Family 15h processors the following power values can be +calculated using different processor northbridge function registers: + +* BasePwrWatts: Specifies in watts the maximum amount of power + consumed by the processor for NB and logic external to the core. +* ProcessorPwrWatts: Specifies in watts the maximum amount of power + the processor can support. +* CurrPwrWatts: Specifies in watts the current amount of power being + consumed by the processor. + +This driver provides ProcessorPwrWatts and CurrPwrWatts: +* power1_crit (ProcessorPwrWatts) +* power1_input (CurrPwrWatts) + +On multi-node processors the calculated value is for the entire +package and not for a single node. Thus the driver creates sysfs +attributes only for internal node0 of a multi-node processor. diff --git a/MAINTAINERS b/MAINTAINERS index 98c324b07a1..88a5bef0947 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -483,6 +483,13 @@ F: drivers/tty/serial/altera_jtaguart.c F: include/linux/altera_uart.h F: include/linux/altera_jtaguart.h +AMD FAM15H PROCESSOR POWER MONITORING DRIVER +M: Andreas Herrmann <andreas.herrmann3@amd.com> +L: lm-sensors@lm-sensors.org +S: Maintained +F: Documentation/hwmon/fam15h_power +F: drivers/hwmon/fam15h_power.c + AMD GEODE CS5536 USB DEVICE CONTROLLER DRIVER M: Thomas Dahlmann <dahlmann.thomas@arcor.de> L: linux-geode@lists.infradead.org (moderated for non-subscribers) diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index 511f1f4802f..567dfae94bb 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -248,6 +248,16 @@ config SENSORS_K10TEMP This driver can also be built as a module. If so, the module will be called k10temp. +config SENSORS_FAM15H_POWER + tristate "AMD Family 15h processor power" + depends on X86 && PCI + help + If you say yes here you get support for processor power + information of your AMD family 15h CPU. + + This driver can also be built as a module. If so, the module + will be called fam15h_power. + config SENSORS_ASB100 tristate "Asus ASB100 Bach" depends on X86 && I2C && EXPERIMENTAL diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile index 28e8d52f637..8524db270bf 100644 --- a/drivers/hwmon/Makefile +++ b/drivers/hwmon/Makefile @@ -48,6 +48,7 @@ obj-$(CONFIG_SENSORS_EMC2103) += emc2103.o obj-$(CONFIG_SENSORS_F71805F) += f71805f.o obj-$(CONFIG_SENSORS_F71882FG) += f71882fg.o obj-$(CONFIG_SENSORS_F75375S) += f75375s.o +obj-$(CONFIG_SENSORS_FAM15H_POWER) += fam15h_power.o obj-$(CONFIG_SENSORS_FSCHMD) += fschmd.o obj-$(CONFIG_SENSORS_G760A) += g760a.o obj-$(CONFIG_SENSORS_GL518SM) += gl518sm.o diff --git a/drivers/hwmon/fam15h_power.c b/drivers/hwmon/fam15h_power.c new file mode 100644 index 00000000000..523f8fb9e7d --- /dev/null +++ b/drivers/hwmon/fam15h_power.c @@ -0,0 +1,229 @@ +/* + * fam15h_power.c - AMD Family 15h processor power monitoring + * + * Copyright (c) 2011 Advanced Micro Devices, Inc. + * Author: Andreas Herrmann <andreas.herrmann3@amd.com> + * + * + * This driver is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License; either + * version 2 of the License, or (at your option) any later version. + * + * This driver 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 driver; if not, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/err.h> +#include <linux/hwmon.h> +#include <linux/hwmon-sysfs.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/pci.h> +#include <linux/bitops.h> +#include <asm/processor.h> + +MODULE_DESCRIPTION("AMD Family 15h CPU processor power monitor"); +MODULE_AUTHOR("Andreas Herrmann <andreas.herrmann3@amd.com>"); +MODULE_LICENSE("GPL"); + +/* D18F3 */ +#define REG_NORTHBRIDGE_CAP 0xe8 + +/* D18F4 */ +#define REG_PROCESSOR_TDP 0x1b8 + +/* D18F5 */ +#define REG_TDP_RUNNING_AVERAGE 0xe0 +#define REG_TDP_LIMIT3 0xe8 + +struct fam15h_power_data { + struct device *hwmon_dev; + unsigned int tdp_to_watts; + unsigned int base_tdp; + unsigned int processor_pwr_watts; +}; + +static ssize_t show_power(struct device *dev, + struct device_attribute *attr, char *buf) +{ + u32 val, tdp_limit, running_avg_range; + s32 running_avg_capture; + u64 curr_pwr_watts; + struct pci_dev *f4 = to_pci_dev(dev); + struct fam15h_power_data *data = dev_get_drvdata(dev); + + pci_bus_read_config_dword(f4->bus, PCI_DEVFN(PCI_SLOT(f4->devfn), 5), + REG_TDP_RUNNING_AVERAGE, &val); + running_avg_capture = (val >> 4) & 0x3fffff; + running_avg_capture = sign_extend32(running_avg_capture, 22); + running_avg_range = val & 0xf; + + pci_bus_read_config_dword(f4->bus, PCI_DEVFN(PCI_SLOT(f4->devfn), 5), + REG_TDP_LIMIT3, &val); + + tdp_limit = val >> 16; + curr_pwr_watts = tdp_limit + data->base_tdp - + (s32)(running_avg_capture >> (running_avg_range + 1)); + curr_pwr_watts *= data->tdp_to_watts; + + /* + * Convert to microWatt + * + * power is in Watt provided as fixed point integer with + * scaling factor 1/(2^16). For conversion we use + * (10^6)/(2^16) = 15625/(2^10) + */ + curr_pwr_watts = (curr_pwr_watts * 15625) >> 10; + return sprintf(buf, "%u\n", (unsigned int) curr_pwr_watts); +} +static DEVICE_ATTR(power1_input, S_IRUGO, show_power, NULL); + +static ssize_t show_power_crit(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct fam15h_power_data *data = dev_get_drvdata(dev); + + return sprintf(buf, "%u\n", data->processor_pwr_watts); +} +static DEVICE_ATTR(power1_crit, S_IRUGO, show_power_crit, NULL); + +static ssize_t show_name(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return sprintf(buf, "fam15h_power\n"); +} +static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); + +static struct attribute *fam15h_power_attrs[] = { + &dev_attr_power1_input.attr, + &dev_attr_power1_crit.attr, + &dev_attr_name.attr, + NULL +}; + +static const struct attribute_group fam15h_power_attr_group = { + .attrs = fam15h_power_attrs, +}; + +static bool __devinit fam15h_power_is_internal_node0(struct pci_dev *f4) +{ + u32 val; + + pci_bus_read_config_dword(f4->bus, PCI_DEVFN(PCI_SLOT(f4->devfn), 3), + REG_NORTHBRIDGE_CAP, &val); + if ((val & BIT(29)) && ((val >> 30) & 3)) + return false; + + return true; +} + +static void __devinit fam15h_power_init_data(struct pci_dev *f4, + struct fam15h_power_data *data) +{ + u32 val; + u64 tmp; + + pci_read_config_dword(f4, REG_PROCESSOR_TDP, &val); + data->base_tdp = val >> 16; + tmp = val & 0xffff; + + pci_bus_read_config_dword(f4->bus, PCI_DEVFN(PCI_SLOT(f4->devfn), 5), + REG_TDP_LIMIT3, &val); + + data->tdp_to_watts = ((val & 0x3ff) << 6) | ((val >> 10) & 0x3f); + tmp *= data->tdp_to_watts; + + /* result not allowed to be >= 256W */ + if ((tmp >> 16) >= 256) + dev_warn(&f4->dev, "Bogus value for ProcessorPwrWatts " + "(processor_pwr_watts>=%u)\n", + (unsigned int) (tmp >> 16)); + + /* convert to microWatt */ + data->processor_pwr_watts = (tmp * 15625) >> 10; +} + +static int __devinit fam15h_power_probe(struct pci_dev *pdev, + const struct pci_device_id *id) +{ + struct fam15h_power_data *data; + struct device *dev; + int err; + + if (!fam15h_power_is_internal_node0(pdev)) { + err = -ENODEV; + goto exit; + } + + data = kzalloc(sizeof(struct fam15h_power_data), GFP_KERNEL); + if (!data) { + err = -ENOMEM; + goto exit; + } + fam15h_power_init_data(pdev, data); + dev = &pdev->dev; + + dev_set_drvdata(dev, data); + err = sysfs_create_group(&dev->kobj, &fam15h_power_attr_group); + if (err) + goto exit_free_data; + + data->hwmon_dev = hwmon_device_register(dev); + if (IS_ERR(data->hwmon_dev)) { + err = PTR_ERR(data->hwmon_dev); + goto exit_remove_group; + } + + return 0; + +exit_remove_group: + sysfs_remove_group(&dev->kobj, &fam15h_power_attr_group); +exit_free_data: + kfree(data); +exit: + return err; +} + +static void __devexit fam15h_power_remove(struct pci_dev *pdev) +{ + struct device *dev; + struct fam15h_power_data *data; + + dev = &pdev->dev; + data = dev_get_drvdata(dev); + hwmon_device_unregister(data->hwmon_dev); + sysfs_remove_group(&dev->kobj, &fam15h_power_attr_group); + dev_set_drvdata(dev, NULL); + kfree(data); +} + +static DEFINE_PCI_DEVICE_TABLE(fam15h_power_id_table) = { + { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_NB_F4) }, + {} +}; +MODULE_DEVICE_TABLE(pci, fam15h_power_id_table); + +static struct pci_driver fam15h_power_driver = { + .name = "fam15h_power", + .id_table = fam15h_power_id_table, + .probe = fam15h_power_probe, + .remove = __devexit_p(fam15h_power_remove), +}; + +static int __init fam15h_power_init(void) +{ + return pci_register_driver(&fam15h_power_driver); +} + +static void __exit fam15h_power_exit(void) +{ + pci_unregister_driver(&fam15h_power_driver); +} + +module_init(fam15h_power_init) +module_exit(fam15h_power_exit) |