| Message ID | 1600669071-26235-3-git-send-email-yilun.xu@intel.com (mailing list archive) |
|---|---|
| State | Accepted |
| Headers | show |
| Series | add Intel MAX 10 BMC MFD driver & hwmon sub driver | expand |
On 9/20/20 11:17 PM, Xu Yilun wrote: > This patch adds hwmon functionality for Intel MAX 10 BMC chip. This BMC > chip connects to a set of sensor chips to monitor current, voltage, > thermal and power of different components on board. The BMC firmware is > responsible for sensor data sampling and recording in shared registers. > Host driver reads the sensor data from these shared registers and > exposes them to users as hwmon interfaces. > > Signed-off-by: Xu Yilun <yilun.xu@intel.com> > Signed-off-by: Wu Hao <hao.wu@intel.com> > Signed-off-by: Matthew Gerlach <matthew.gerlach@linux.intel.com> > Signed-off-by: Tom Rix <trix@redhat.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> > --- > v2: add the Documentation > refactor the code, provide static hwmon_channel_info > remove Unnecessary hwmon-sysfs.h > make the sensor data table const > v3: make the data tables a pointer array indexed by hwmon_sensor_types > some minor fixes > --- > Documentation/hwmon/index.rst | 1 + > Documentation/hwmon/intel-m10-bmc-hwmon.rst | 78 +++++++ > drivers/hwmon/Kconfig | 11 + > drivers/hwmon/Makefile | 1 + > drivers/hwmon/intel-m10-bmc-hwmon.c | 334 ++++++++++++++++++++++++++++ > 5 files changed, 425 insertions(+) > create mode 100644 Documentation/hwmon/intel-m10-bmc-hwmon.rst > create mode 100644 drivers/hwmon/intel-m10-bmc-hwmon.c > > diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst > index a926f1a..4bcb1a7 100644 > --- a/Documentation/hwmon/index.rst > +++ b/Documentation/hwmon/index.rst > @@ -74,6 +74,7 @@ Hardware Monitoring Kernel Drivers > ina209 > ina2xx > ina3221 > + intel-m10-bmc-hwmon > ir35221 > ir38064 > isl68137 > diff --git a/Documentation/hwmon/intel-m10-bmc-hwmon.rst b/Documentation/hwmon/intel-m10-bmc-hwmon.rst > new file mode 100644 > index 0000000..3d148c6 > --- /dev/null > +++ b/Documentation/hwmon/intel-m10-bmc-hwmon.rst > @@ -0,0 +1,78 @@ > +.. SPDX-License-Identifier: GPL-2.0 > + > +Kernel driver intel-m10-bmc-hwmon > +================================= > + > +Supported chips: > + > + * Intel MAX 10 BMC for Intel PAC N3000 > + > + Prefix: 'n3000bmc-hwmon' > + > +Author: Xu Yilun <yilun.xu@intel.com> > + > + > +Description > +----------- > + > +This driver adds the temperature, voltage, current and power reading > +support for the Intel MAX 10 Board Management Controller (BMC) chip. > +The BMC chip is integrated in some Intel Programmable Acceleration > +Cards (PAC). It connects to a set of sensor chips to monitor the > +sensor data of different components on the board. The BMC firmware is > +responsible for sensor data sampling and recording in shared > +registers. The host driver reads the sensor data from these shared > +registers and exposes them to users as hwmon interfaces. > + > +The BMC chip is implemented using the Intel MAX 10 CPLD. It could be > +reprogramed to some variants in order to support different Intel > +PACs. The driver is designed to be able to distinguish between the > +variants, but now it only supports the BMC for Intel PAC N3000. > + > + > +Sysfs attributes > +---------------- > + > +The following attributes are supported: > + > +- Intel MAX 10 BMC for Intel PAC N3000: > + > +======================= ======================================================= > +tempX_input Temperature of the component (specified by tempX_label) > +tempX_max Temperature maximum setpoint of the component > +tempX_crit Temperature critical setpoint of the component > +tempX_max_hyst Hysteresis for temperature maximum of the component > +tempX_crit_hyst Hysteresis for temperature critical of the component > +temp1_label "Board Temperature" > +temp2_label "FPGA Die Temperature" > +temp3_label "QSFP0 Temperature" > +temp4_label "QSFP1 Temperature" > +temp5_label "Retimer A Temperature" > +temp6_label "Retimer A SerDes Temperature" > +temp7_label "Retimer B Temperature" > +temp8_label "Retimer B SerDes Temperature" > + > +inX_input Measured voltage of the component (specified by > + inX_label) > +in0_label "QSFP0 Supply Voltage" > +in1_label "QSFP1 Supply Voltage" > +in2_label "FPGA Core Voltage" > +in3_label "12V Backplane Voltage" > +in4_label "1.2V Voltage" > +in5_label "12V AUX Voltage" > +in6_label "1.8V Voltage" > +in7_label "3.3V Voltage" > + > +currX_input Measured current of the component (specified by > + currX_label) > +curr1_label "FPGA Core Current" > +curr2_label "12V Backplane Current" > +curr3_label "12V AUX Current" > + > +powerX_input Measured power of the component (specified by > + powerX_label) > +power1_label "Board Power" > + > +======================= ======================================================= > + > +All the attributes are read-only. > diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig > index 8dc28b2..53af15c 100644 > --- a/drivers/hwmon/Kconfig > +++ b/drivers/hwmon/Kconfig > @@ -2064,6 +2064,17 @@ config SENSORS_XGENE > If you say yes here you get support for the temperature > and power sensors for APM X-Gene SoC. > > +config SENSORS_INTEL_M10_BMC_HWMON > + tristate "Intel MAX10 BMC Hardware Monitoring" > + depends on MFD_INTEL_M10_BMC > + help > + This driver provides support for the hardware monitoring functionality > + on Intel MAX10 BMC chip. > + > + This BMC Chip is used on Intel FPGA PCIe Acceleration Cards (PAC). Its > + sensors monitor various telemetry data of different components on the > + card, e.g. board temperature, FPGA core temperature/voltage/current. > + > if ACPI > > comment "ACPI drivers" > diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile > index a8f4b35..ba5a25a 100644 > --- a/drivers/hwmon/Makefile > +++ b/drivers/hwmon/Makefile > @@ -90,6 +90,7 @@ obj-$(CONFIG_SENSORS_IIO_HWMON) += iio_hwmon.o > obj-$(CONFIG_SENSORS_INA209) += ina209.o > obj-$(CONFIG_SENSORS_INA2XX) += ina2xx.o > obj-$(CONFIG_SENSORS_INA3221) += ina3221.o > +obj-$(CONFIG_SENSORS_INTEL_M10_BMC_HWMON) += intel-m10-bmc-hwmon.o > obj-$(CONFIG_SENSORS_IT87) += it87.o > obj-$(CONFIG_SENSORS_JC42) += jc42.o > obj-$(CONFIG_SENSORS_K8TEMP) += k8temp.o > diff --git a/drivers/hwmon/intel-m10-bmc-hwmon.c b/drivers/hwmon/intel-m10-bmc-hwmon.c > new file mode 100644 > index 0000000..17d5e6b > --- /dev/null > +++ b/drivers/hwmon/intel-m10-bmc-hwmon.c > @@ -0,0 +1,334 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Intel MAX 10 BMC HWMON Driver > + * > + * Copyright (C) 2018-2020 Intel Corporation. All rights reserved. > + * > + */ > +#include <linux/device.h> > +#include <linux/hwmon.h> > +#include <linux/mfd/intel-m10-bmc.h> > +#include <linux/module.h> > +#include <linux/mod_devicetable.h> > +#include <linux/platform_device.h> > + > +struct m10bmc_sdata { > + unsigned int reg_input; > + unsigned int reg_max; > + unsigned int reg_crit; > + unsigned int reg_hyst; > + unsigned int reg_min; > + unsigned int multiplier; > + const char *label; > +}; > + > +struct m10bmc_hwmon_board_data { > + const struct m10bmc_sdata *tables[hwmon_max]; > + const struct hwmon_channel_info **hinfo; > +}; > + > +struct m10bmc_hwmon { > + struct device *dev; > + struct hwmon_chip_info chip; > + char *hw_name; > + struct intel_m10bmc *m10bmc; > + const struct m10bmc_hwmon_board_data *bdata; > +}; > + > +static const struct m10bmc_sdata n3000bmc_temp_tbl[] = { > + { 0x100, 0x104, 0x108, 0x10c, 0x0, 500, "Board Temperature" }, > + { 0x110, 0x114, 0x118, 0x0, 0x0, 500, "FPGA Die Temperature" }, > + { 0x11c, 0x124, 0x120, 0x0, 0x0, 500, "QSFP0 Temperature" }, > + { 0x12c, 0x134, 0x130, 0x0, 0x0, 500, "QSFP1 Temperature" }, > + { 0x168, 0x0, 0x0, 0x0, 0x0, 500, "Retimer A Temperature" }, > + { 0x16c, 0x0, 0x0, 0x0, 0x0, 500, "Retimer A SerDes Temperature" }, > + { 0x170, 0x0, 0x0, 0x0, 0x0, 500, "Retimer B Temperature" }, > + { 0x174, 0x0, 0x0, 0x0, 0x0, 500, "Retimer B SerDes Temperature" }, > +}; > + > +static const struct m10bmc_sdata n3000bmc_in_tbl[] = { > + { 0x128, 0x0, 0x0, 0x0, 0x0, 1, "QSFP0 Supply Voltage" }, > + { 0x138, 0x0, 0x0, 0x0, 0x0, 1, "QSFP1 Supply Voltage" }, > + { 0x13c, 0x0, 0x0, 0x0, 0x0, 1, "FPGA Core Voltage" }, > + { 0x144, 0x0, 0x0, 0x0, 0x0, 1, "12V Backplane Voltage" }, > + { 0x14c, 0x0, 0x0, 0x0, 0x0, 1, "1.2V Voltage" }, > + { 0x150, 0x0, 0x0, 0x0, 0x0, 1, "12V AUX Voltage" }, > + { 0x158, 0x0, 0x0, 0x0, 0x0, 1, "1.8V Voltage" }, > + { 0x15c, 0x0, 0x0, 0x0, 0x0, 1, "3.3V Voltage" }, > +}; > + > +static const struct m10bmc_sdata n3000bmc_curr_tbl[] = { > + { 0x140, 0x0, 0x0, 0x0, 0x0, 1, "FPGA Core Current" }, > + { 0x148, 0x0, 0x0, 0x0, 0x0, 1, "12V Backplane Current" }, > + { 0x154, 0x0, 0x0, 0x0, 0x0, 1, "12V AUX Current" }, > +}; > + > +static const struct m10bmc_sdata n3000bmc_power_tbl[] = { > + { 0x160, 0x0, 0x0, 0x0, 0x0, 1000, "Board Power" }, > +}; > + > +static const struct hwmon_channel_info *n3000bmc_hinfo[] = { > + HWMON_CHANNEL_INFO(temp, > + HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST | > + HWMON_T_CRIT | HWMON_T_CRIT_HYST | HWMON_T_LABEL, > + HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT | > + HWMON_T_LABEL, > + HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT | > + HWMON_T_LABEL, > + HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT | > + HWMON_T_LABEL, > + HWMON_T_INPUT | HWMON_T_LABEL, > + HWMON_T_INPUT | HWMON_T_LABEL, > + HWMON_T_INPUT | HWMON_T_LABEL, > + HWMON_T_INPUT | HWMON_T_LABEL), > + HWMON_CHANNEL_INFO(in, > + HWMON_I_INPUT | HWMON_I_LABEL, > + HWMON_I_INPUT | HWMON_I_LABEL, > + HWMON_I_INPUT | HWMON_I_LABEL, > + HWMON_I_INPUT | HWMON_I_LABEL, > + HWMON_I_INPUT | HWMON_I_LABEL, > + HWMON_I_INPUT | HWMON_I_LABEL, > + HWMON_I_INPUT | HWMON_I_LABEL, > + HWMON_I_INPUT | HWMON_I_LABEL), > + HWMON_CHANNEL_INFO(curr, > + HWMON_C_INPUT | HWMON_C_LABEL, > + HWMON_C_INPUT | HWMON_C_LABEL, > + HWMON_C_INPUT | HWMON_C_LABEL), > + HWMON_CHANNEL_INFO(power, > + HWMON_P_INPUT | HWMON_P_LABEL), > + NULL > +}; > + > +static const struct m10bmc_hwmon_board_data n3000bmc_hwmon_bdata = { > + .tables = { > + [hwmon_temp] = n3000bmc_temp_tbl, > + [hwmon_in] = n3000bmc_in_tbl, > + [hwmon_curr] = n3000bmc_curr_tbl, > + [hwmon_power] = n3000bmc_power_tbl, > + }, > + > + .hinfo = n3000bmc_hinfo, > +}; > + > +static umode_t > +m10bmc_hwmon_is_visible(const void *data, enum hwmon_sensor_types type, > + u32 attr, int channel) > +{ > + return 0444; > +} > + > +static const struct m10bmc_sdata * > +find_sensor_data(struct m10bmc_hwmon *hw, enum hwmon_sensor_types type, > + int channel) > +{ > + const struct m10bmc_sdata *tbl; > + > + tbl = hw->bdata->tables[type]; > + if (!tbl) > + return ERR_PTR(-EOPNOTSUPP); > + > + return &tbl[channel]; > +} > + > +static int do_sensor_read(struct m10bmc_hwmon *hw, > + const struct m10bmc_sdata *data, > + unsigned int regoff, long *val) > +{ > + unsigned int regval; > + int ret; > + > + ret = m10bmc_sys_read(hw->m10bmc, regoff, ®val); > + if (ret) > + return ret; > + > + /* > + * BMC Firmware will return 0xdeadbeef if the sensor value is invalid > + * at that time. This usually happens on sensor channels which connect > + * to external pluggable modules, e.g. QSFP temperature and voltage. > + * When the QSFP is unplugged from cage, driver will get 0xdeadbeef > + * from their registers. > + */ > + if (regval == 0xdeadbeef) > + return -ENODATA; > + > + *val = regval * data->multiplier; > + > + return 0; > +} > + > +static int m10bmc_hwmon_read(struct device *dev, enum hwmon_sensor_types type, > + u32 attr, int channel, long *val) > +{ > + struct m10bmc_hwmon *hw = dev_get_drvdata(dev); > + unsigned int reg = 0, reg_hyst = 0; > + const struct m10bmc_sdata *data; > + long hyst, value; > + int ret; > + > + data = find_sensor_data(hw, type, channel); > + if (IS_ERR(data)) > + return PTR_ERR(data); > + > + switch (type) { > + case hwmon_temp: > + switch (attr) { > + case hwmon_temp_input: > + reg = data->reg_input; > + break; > + case hwmon_temp_max_hyst: > + reg_hyst = data->reg_hyst; > + fallthrough; > + case hwmon_temp_max: > + reg = data->reg_max; > + break; > + case hwmon_temp_crit_hyst: > + reg_hyst = data->reg_hyst; > + fallthrough; > + case hwmon_temp_crit: > + reg = data->reg_crit; > + break; > + default: > + return -EOPNOTSUPP; > + } > + break; > + case hwmon_in: > + switch (attr) { > + case hwmon_in_input: > + reg = data->reg_input; > + break; > + case hwmon_in_max: > + reg = data->reg_max; > + break; > + case hwmon_in_crit: > + reg = data->reg_crit; > + break; > + case hwmon_in_min: > + reg = data->reg_min; > + break; > + default: > + return -EOPNOTSUPP; > + } > + break; > + case hwmon_curr: > + switch (attr) { > + case hwmon_curr_input: > + reg = data->reg_input; > + break; > + case hwmon_curr_max: > + reg = data->reg_max; > + break; > + case hwmon_curr_crit: > + reg = data->reg_crit; > + break; > + default: > + return -EOPNOTSUPP; > + } > + break; > + case hwmon_power: > + switch (attr) { > + case hwmon_power_input: > + reg = data->reg_input; > + break; > + default: > + return -EOPNOTSUPP; > + } > + break; > + default: > + return -EOPNOTSUPP; > + } > + > + if (!reg) > + return -EOPNOTSUPP; > + > + ret = do_sensor_read(hw, data, reg, &value); > + if (ret) > + return ret; > + > + if (reg_hyst) { > + ret = do_sensor_read(hw, data, reg_hyst, &hyst); > + if (ret) > + return ret; > + > + value -= hyst; > + } > + > + *val = value; > + > + return 0; > +} > + > +static int m10bmc_hwmon_read_string(struct device *dev, > + enum hwmon_sensor_types type, > + u32 attr, int channel, const char **str) > +{ > + struct m10bmc_hwmon *hw = dev_get_drvdata(dev); > + const struct m10bmc_sdata *data; > + > + data = find_sensor_data(hw, type, channel); > + if (IS_ERR(data)) > + return PTR_ERR(data); > + > + *str = data->label; > + > + return 0; > +} > + > +static const struct hwmon_ops m10bmc_hwmon_ops = { > + .is_visible = m10bmc_hwmon_is_visible, > + .read = m10bmc_hwmon_read, > + .read_string = m10bmc_hwmon_read_string, > +}; > + > +static int m10bmc_hwmon_probe(struct platform_device *pdev) > +{ > + const struct platform_device_id *id = platform_get_device_id(pdev); > + struct intel_m10bmc *m10bmc = dev_get_drvdata(pdev->dev.parent); > + struct device *hwmon_dev, *dev = &pdev->dev; > + struct m10bmc_hwmon *hw; > + int i; > + > + hw = devm_kzalloc(dev, sizeof(*hw), GFP_KERNEL); > + if (!hw) > + return -ENOMEM; > + > + hw->dev = dev; > + hw->m10bmc = m10bmc; > + hw->bdata = (const struct m10bmc_hwmon_board_data *)id->driver_data; > + > + hw->chip.info = hw->bdata->hinfo; > + hw->chip.ops = &m10bmc_hwmon_ops; > + > + hw->hw_name = devm_kstrdup(dev, id->name, GFP_KERNEL); > + if (!hw->hw_name) > + return -ENOMEM; > + > + for (i = 0; hw->hw_name[i]; i++) > + if (hwmon_is_bad_char(hw->hw_name[i])) > + hw->hw_name[i] = '_'; > + > + hwmon_dev = devm_hwmon_device_register_with_info(dev, hw->hw_name, > + hw, &hw->chip, NULL); > + return PTR_ERR_OR_ZERO(hwmon_dev); > +} > + > +static const struct platform_device_id intel_m10bmc_hwmon_ids[] = { > + { > + .name = "n3000bmc-hwmon", > + .driver_data = (unsigned long)&n3000bmc_hwmon_bdata, > + }, > + { } > +}; > + > +static struct platform_driver intel_m10bmc_hwmon_driver = { > + .probe = m10bmc_hwmon_probe, > + .driver = { > + .name = "intel-m10-bmc-hwmon", > + }, > + .id_table = intel_m10bmc_hwmon_ids, > +}; > +module_platform_driver(intel_m10bmc_hwmon_driver); > + > +MODULE_DEVICE_TABLE(platform, intel_m10bmc_hwmon_ids); > +MODULE_AUTHOR("Intel Corporation"); > +MODULE_DESCRIPTION("Intel MAX 10 BMC hardware monitor"); > +MODULE_LICENSE("GPL"); >
diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst index a926f1a..4bcb1a7 100644 --- a/Documentation/hwmon/index.rst +++ b/Documentation/hwmon/index.rst @@ -74,6 +74,7 @@ Hardware Monitoring Kernel Drivers ina209 ina2xx ina3221 + intel-m10-bmc-hwmon ir35221 ir38064 isl68137 diff --git a/Documentation/hwmon/intel-m10-bmc-hwmon.rst b/Documentation/hwmon/intel-m10-bmc-hwmon.rst new file mode 100644 index 0000000..3d148c6 --- /dev/null +++ b/Documentation/hwmon/intel-m10-bmc-hwmon.rst @@ -0,0 +1,78 @@ +.. SPDX-License-Identifier: GPL-2.0 + +Kernel driver intel-m10-bmc-hwmon +================================= + +Supported chips: + + * Intel MAX 10 BMC for Intel PAC N3000 + + Prefix: 'n3000bmc-hwmon' + +Author: Xu Yilun <yilun.xu@intel.com> + + +Description +----------- + +This driver adds the temperature, voltage, current and power reading +support for the Intel MAX 10 Board Management Controller (BMC) chip. +The BMC chip is integrated in some Intel Programmable Acceleration +Cards (PAC). It connects to a set of sensor chips to monitor the +sensor data of different components on the board. The BMC firmware is +responsible for sensor data sampling and recording in shared +registers. The host driver reads the sensor data from these shared +registers and exposes them to users as hwmon interfaces. + +The BMC chip is implemented using the Intel MAX 10 CPLD. It could be +reprogramed to some variants in order to support different Intel +PACs. The driver is designed to be able to distinguish between the +variants, but now it only supports the BMC for Intel PAC N3000. + + +Sysfs attributes +---------------- + +The following attributes are supported: + +- Intel MAX 10 BMC for Intel PAC N3000: + +======================= ======================================================= +tempX_input Temperature of the component (specified by tempX_label) +tempX_max Temperature maximum setpoint of the component +tempX_crit Temperature critical setpoint of the component +tempX_max_hyst Hysteresis for temperature maximum of the component +tempX_crit_hyst Hysteresis for temperature critical of the component +temp1_label "Board Temperature" +temp2_label "FPGA Die Temperature" +temp3_label "QSFP0 Temperature" +temp4_label "QSFP1 Temperature" +temp5_label "Retimer A Temperature" +temp6_label "Retimer A SerDes Temperature" +temp7_label "Retimer B Temperature" +temp8_label "Retimer B SerDes Temperature" + +inX_input Measured voltage of the component (specified by + inX_label) +in0_label "QSFP0 Supply Voltage" +in1_label "QSFP1 Supply Voltage" +in2_label "FPGA Core Voltage" +in3_label "12V Backplane Voltage" +in4_label "1.2V Voltage" +in5_label "12V AUX Voltage" +in6_label "1.8V Voltage" +in7_label "3.3V Voltage" + +currX_input Measured current of the component (specified by + currX_label) +curr1_label "FPGA Core Current" +curr2_label "12V Backplane Current" +curr3_label "12V AUX Current" + +powerX_input Measured power of the component (specified by + powerX_label) +power1_label "Board Power" + +======================= ======================================================= + +All the attributes are read-only. diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index 8dc28b2..53af15c 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -2064,6 +2064,17 @@ config SENSORS_XGENE If you say yes here you get support for the temperature and power sensors for APM X-Gene SoC. +config SENSORS_INTEL_M10_BMC_HWMON + tristate "Intel MAX10 BMC Hardware Monitoring" + depends on MFD_INTEL_M10_BMC + help + This driver provides support for the hardware monitoring functionality + on Intel MAX10 BMC chip. + + This BMC Chip is used on Intel FPGA PCIe Acceleration Cards (PAC). Its + sensors monitor various telemetry data of different components on the + card, e.g. board temperature, FPGA core temperature/voltage/current. + if ACPI comment "ACPI drivers" diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile index a8f4b35..ba5a25a 100644 --- a/drivers/hwmon/Makefile +++ b/drivers/hwmon/Makefile @@ -90,6 +90,7 @@ obj-$(CONFIG_SENSORS_IIO_HWMON) += iio_hwmon.o obj-$(CONFIG_SENSORS_INA209) += ina209.o obj-$(CONFIG_SENSORS_INA2XX) += ina2xx.o obj-$(CONFIG_SENSORS_INA3221) += ina3221.o +obj-$(CONFIG_SENSORS_INTEL_M10_BMC_HWMON) += intel-m10-bmc-hwmon.o obj-$(CONFIG_SENSORS_IT87) += it87.o obj-$(CONFIG_SENSORS_JC42) += jc42.o obj-$(CONFIG_SENSORS_K8TEMP) += k8temp.o diff --git a/drivers/hwmon/intel-m10-bmc-hwmon.c b/drivers/hwmon/intel-m10-bmc-hwmon.c new file mode 100644 index 0000000..17d5e6b --- /dev/null +++ b/drivers/hwmon/intel-m10-bmc-hwmon.c @@ -0,0 +1,334 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Intel MAX 10 BMC HWMON Driver + * + * Copyright (C) 2018-2020 Intel Corporation. All rights reserved. + * + */ +#include <linux/device.h> +#include <linux/hwmon.h> +#include <linux/mfd/intel-m10-bmc.h> +#include <linux/module.h> +#include <linux/mod_devicetable.h> +#include <linux/platform_device.h> + +struct m10bmc_sdata { + unsigned int reg_input; + unsigned int reg_max; + unsigned int reg_crit; + unsigned int reg_hyst; + unsigned int reg_min; + unsigned int multiplier; + const char *label; +}; + +struct m10bmc_hwmon_board_data { + const struct m10bmc_sdata *tables[hwmon_max]; + const struct hwmon_channel_info **hinfo; +}; + +struct m10bmc_hwmon { + struct device *dev; + struct hwmon_chip_info chip; + char *hw_name; + struct intel_m10bmc *m10bmc; + const struct m10bmc_hwmon_board_data *bdata; +}; + +static const struct m10bmc_sdata n3000bmc_temp_tbl[] = { + { 0x100, 0x104, 0x108, 0x10c, 0x0, 500, "Board Temperature" }, + { 0x110, 0x114, 0x118, 0x0, 0x0, 500, "FPGA Die Temperature" }, + { 0x11c, 0x124, 0x120, 0x0, 0x0, 500, "QSFP0 Temperature" }, + { 0x12c, 0x134, 0x130, 0x0, 0x0, 500, "QSFP1 Temperature" }, + { 0x168, 0x0, 0x0, 0x0, 0x0, 500, "Retimer A Temperature" }, + { 0x16c, 0x0, 0x0, 0x0, 0x0, 500, "Retimer A SerDes Temperature" }, + { 0x170, 0x0, 0x0, 0x0, 0x0, 500, "Retimer B Temperature" }, + { 0x174, 0x0, 0x0, 0x0, 0x0, 500, "Retimer B SerDes Temperature" }, +}; + +static const struct m10bmc_sdata n3000bmc_in_tbl[] = { + { 0x128, 0x0, 0x0, 0x0, 0x0, 1, "QSFP0 Supply Voltage" }, + { 0x138, 0x0, 0x0, 0x0, 0x0, 1, "QSFP1 Supply Voltage" }, + { 0x13c, 0x0, 0x0, 0x0, 0x0, 1, "FPGA Core Voltage" }, + { 0x144, 0x0, 0x0, 0x0, 0x0, 1, "12V Backplane Voltage" }, + { 0x14c, 0x0, 0x0, 0x0, 0x0, 1, "1.2V Voltage" }, + { 0x150, 0x0, 0x0, 0x0, 0x0, 1, "12V AUX Voltage" }, + { 0x158, 0x0, 0x0, 0x0, 0x0, 1, "1.8V Voltage" }, + { 0x15c, 0x0, 0x0, 0x0, 0x0, 1, "3.3V Voltage" }, +}; + +static const struct m10bmc_sdata n3000bmc_curr_tbl[] = { + { 0x140, 0x0, 0x0, 0x0, 0x0, 1, "FPGA Core Current" }, + { 0x148, 0x0, 0x0, 0x0, 0x0, 1, "12V Backplane Current" }, + { 0x154, 0x0, 0x0, 0x0, 0x0, 1, "12V AUX Current" }, +}; + +static const struct m10bmc_sdata n3000bmc_power_tbl[] = { + { 0x160, 0x0, 0x0, 0x0, 0x0, 1000, "Board Power" }, +}; + +static const struct hwmon_channel_info *n3000bmc_hinfo[] = { + HWMON_CHANNEL_INFO(temp, + HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST | + HWMON_T_CRIT | HWMON_T_CRIT_HYST | HWMON_T_LABEL, + HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT | + HWMON_T_LABEL, + HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT | + HWMON_T_LABEL, + HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT | + HWMON_T_LABEL, + HWMON_T_INPUT | HWMON_T_LABEL, + HWMON_T_INPUT | HWMON_T_LABEL, + HWMON_T_INPUT | HWMON_T_LABEL, + HWMON_T_INPUT | HWMON_T_LABEL), + HWMON_CHANNEL_INFO(in, + HWMON_I_INPUT | HWMON_I_LABEL, + HWMON_I_INPUT | HWMON_I_LABEL, + HWMON_I_INPUT | HWMON_I_LABEL, + HWMON_I_INPUT | HWMON_I_LABEL, + HWMON_I_INPUT | HWMON_I_LABEL, + HWMON_I_INPUT | HWMON_I_LABEL, + HWMON_I_INPUT | HWMON_I_LABEL, + HWMON_I_INPUT | HWMON_I_LABEL), + HWMON_CHANNEL_INFO(curr, + HWMON_C_INPUT | HWMON_C_LABEL, + HWMON_C_INPUT | HWMON_C_LABEL, + HWMON_C_INPUT | HWMON_C_LABEL), + HWMON_CHANNEL_INFO(power, + HWMON_P_INPUT | HWMON_P_LABEL), + NULL +}; + +static const struct m10bmc_hwmon_board_data n3000bmc_hwmon_bdata = { + .tables = { + [hwmon_temp] = n3000bmc_temp_tbl, + [hwmon_in] = n3000bmc_in_tbl, + [hwmon_curr] = n3000bmc_curr_tbl, + [hwmon_power] = n3000bmc_power_tbl, + }, + + .hinfo = n3000bmc_hinfo, +}; + +static umode_t +m10bmc_hwmon_is_visible(const void *data, enum hwmon_sensor_types type, + u32 attr, int channel) +{ + return 0444; +} + +static const struct m10bmc_sdata * +find_sensor_data(struct m10bmc_hwmon *hw, enum hwmon_sensor_types type, + int channel) +{ + const struct m10bmc_sdata *tbl; + + tbl = hw->bdata->tables[type]; + if (!tbl) + return ERR_PTR(-EOPNOTSUPP); + + return &tbl[channel]; +} + +static int do_sensor_read(struct m10bmc_hwmon *hw, + const struct m10bmc_sdata *data, + unsigned int regoff, long *val) +{ + unsigned int regval; + int ret; + + ret = m10bmc_sys_read(hw->m10bmc, regoff, ®val); + if (ret) + return ret; + + /* + * BMC Firmware will return 0xdeadbeef if the sensor value is invalid + * at that time. This usually happens on sensor channels which connect + * to external pluggable modules, e.g. QSFP temperature and voltage. + * When the QSFP is unplugged from cage, driver will get 0xdeadbeef + * from their registers. + */ + if (regval == 0xdeadbeef) + return -ENODATA; + + *val = regval * data->multiplier; + + return 0; +} + +static int m10bmc_hwmon_read(struct device *dev, enum hwmon_sensor_types type, + u32 attr, int channel, long *val) +{ + struct m10bmc_hwmon *hw = dev_get_drvdata(dev); + unsigned int reg = 0, reg_hyst = 0; + const struct m10bmc_sdata *data; + long hyst, value; + int ret; + + data = find_sensor_data(hw, type, channel); + if (IS_ERR(data)) + return PTR_ERR(data); + + switch (type) { + case hwmon_temp: + switch (attr) { + case hwmon_temp_input: + reg = data->reg_input; + break; + case hwmon_temp_max_hyst: + reg_hyst = data->reg_hyst; + fallthrough; + case hwmon_temp_max: + reg = data->reg_max; + break; + case hwmon_temp_crit_hyst: + reg_hyst = data->reg_hyst; + fallthrough; + case hwmon_temp_crit: + reg = data->reg_crit; + break; + default: + return -EOPNOTSUPP; + } + break; + case hwmon_in: + switch (attr) { + case hwmon_in_input: + reg = data->reg_input; + break; + case hwmon_in_max: + reg = data->reg_max; + break; + case hwmon_in_crit: + reg = data->reg_crit; + break; + case hwmon_in_min: + reg = data->reg_min; + break; + default: + return -EOPNOTSUPP; + } + break; + case hwmon_curr: + switch (attr) { + case hwmon_curr_input: + reg = data->reg_input; + break; + case hwmon_curr_max: + reg = data->reg_max; + break; + case hwmon_curr_crit: + reg = data->reg_crit; + break; + default: + return -EOPNOTSUPP; + } + break; + case hwmon_power: + switch (attr) { + case hwmon_power_input: + reg = data->reg_input; + break; + default: + return -EOPNOTSUPP; + } + break; + default: + return -EOPNOTSUPP; + } + + if (!reg) + return -EOPNOTSUPP; + + ret = do_sensor_read(hw, data, reg, &value); + if (ret) + return ret; + + if (reg_hyst) { + ret = do_sensor_read(hw, data, reg_hyst, &hyst); + if (ret) + return ret; + + value -= hyst; + } + + *val = value; + + return 0; +} + +static int m10bmc_hwmon_read_string(struct device *dev, + enum hwmon_sensor_types type, + u32 attr, int channel, const char **str) +{ + struct m10bmc_hwmon *hw = dev_get_drvdata(dev); + const struct m10bmc_sdata *data; + + data = find_sensor_data(hw, type, channel); + if (IS_ERR(data)) + return PTR_ERR(data); + + *str = data->label; + + return 0; +} + +static const struct hwmon_ops m10bmc_hwmon_ops = { + .is_visible = m10bmc_hwmon_is_visible, + .read = m10bmc_hwmon_read, + .read_string = m10bmc_hwmon_read_string, +}; + +static int m10bmc_hwmon_probe(struct platform_device *pdev) +{ + const struct platform_device_id *id = platform_get_device_id(pdev); + struct intel_m10bmc *m10bmc = dev_get_drvdata(pdev->dev.parent); + struct device *hwmon_dev, *dev = &pdev->dev; + struct m10bmc_hwmon *hw; + int i; + + hw = devm_kzalloc(dev, sizeof(*hw), GFP_KERNEL); + if (!hw) + return -ENOMEM; + + hw->dev = dev; + hw->m10bmc = m10bmc; + hw->bdata = (const struct m10bmc_hwmon_board_data *)id->driver_data; + + hw->chip.info = hw->bdata->hinfo; + hw->chip.ops = &m10bmc_hwmon_ops; + + hw->hw_name = devm_kstrdup(dev, id->name, GFP_KERNEL); + if (!hw->hw_name) + return -ENOMEM; + + for (i = 0; hw->hw_name[i]; i++) + if (hwmon_is_bad_char(hw->hw_name[i])) + hw->hw_name[i] = '_'; + + hwmon_dev = devm_hwmon_device_register_with_info(dev, hw->hw_name, + hw, &hw->chip, NULL); + return PTR_ERR_OR_ZERO(hwmon_dev); +} + +static const struct platform_device_id intel_m10bmc_hwmon_ids[] = { + { + .name = "n3000bmc-hwmon", + .driver_data = (unsigned long)&n3000bmc_hwmon_bdata, + }, + { } +}; + +static struct platform_driver intel_m10bmc_hwmon_driver = { + .probe = m10bmc_hwmon_probe, + .driver = { + .name = "intel-m10-bmc-hwmon", + }, + .id_table = intel_m10bmc_hwmon_ids, +}; +module_platform_driver(intel_m10bmc_hwmon_driver); + +MODULE_DEVICE_TABLE(platform, intel_m10bmc_hwmon_ids); +MODULE_AUTHOR("Intel Corporation"); +MODULE_DESCRIPTION("Intel MAX 10 BMC hardware monitor"); +MODULE_LICENSE("GPL");