Commit 7bce8981 authored by Quan Nguyen's avatar Quan Nguyen Committed by Guenter Roeck
Browse files

hwmon: Add Ampere's Altra smpro-hwmon driver 



This commit adds support for Ampere SMpro hwmon driver. This driver
supports accessing various CPU sensors provided by the SMpro co-processor
including temperature, power, voltages, and current.

Signed-off-by: default avatarQuan Nguyen <quan@os.amperecomputing.com>
Link: https://lore.kernel.org/r/20220929094321.770125-2-quan@os.amperecomputing.com


Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
parent bba63de0

drivers/hwmon/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -67,6 +67,14 @@ config SENSORS_ABITUGURU3 
	  This driver can also be built as a module. If so, the module

	  will be called abituguru3.



config SENSORS_SMPRO

	tristate "Ampere's Altra SMpro hardware monitoring driver"

	depends on MFD_SMPRO

	help

	  If you say yes here you get support for the thermal, voltage,

	  current and power sensors of Ampere's Altra processor family SoC

	  with SMpro co-processor.



config SENSORS_AD7314

	tristate "Analog Devices AD7314 and compatibles"

	depends on SPI

drivers/hwmon/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -187,6 +187,7 @@ obj-$(CONFIG_SENSORS_SHT4x) += sht4x.o 
obj-$(CONFIG_SENSORS_SHTC1)	+= shtc1.o

obj-$(CONFIG_SENSORS_SIS5595)	+= sis5595.o

obj-$(CONFIG_SENSORS_SMM665)	+= smm665.o

obj-$(CONFIG_SENSORS_SMPRO)	+= smpro-hwmon.o

obj-$(CONFIG_SENSORS_SMSC47B397)+= smsc47b397.o

obj-$(CONFIG_SENSORS_SMSC47M1)	+= smsc47m1.o

obj-$(CONFIG_SENSORS_SMSC47M192)+= smsc47m192.o

drivers/hwmon/smpro-hwmon.c

0 → 100644
+463 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0-only

/*

 * Ampere Computing SoC's SMPro Hardware Monitoring Driver

 *

 * Copyright (c) 2022, Ampere Computing LLC

 */

#include <linux/bitfield.h>

#include <linux/bitops.h>

#include <linux/hwmon.h>

#include <linux/hwmon-sysfs.h>

#include <linux/kernel.h>

#include <linux/mod_devicetable.h>

#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/property.h>

#include <linux/regmap.h>



/* Logical Power Sensor Registers */

#define SOC_TEMP		0x10

#define SOC_VRD_TEMP		0x11

#define DIMM_VRD_TEMP		0x12

#define CORE_VRD_TEMP		0x13

#define CH0_DIMM_TEMP		0x14

#define CH1_DIMM_TEMP		0x15

#define CH2_DIMM_TEMP		0x16

#define CH3_DIMM_TEMP		0x17

#define CH4_DIMM_TEMP		0x18

#define CH5_DIMM_TEMP		0x19

#define CH6_DIMM_TEMP		0x1A

#define CH7_DIMM_TEMP		0x1B

#define RCA_VRD_TEMP		0x1C



#define CORE_VRD_PWR		0x20

#define SOC_PWR			0x21

#define DIMM_VRD1_PWR		0x22

#define DIMM_VRD2_PWR		0x23

#define CORE_VRD_PWR_MW		0x26

#define SOC_PWR_MW		0x27

#define DIMM_VRD1_PWR_MW	0x28

#define DIMM_VRD2_PWR_MW	0x29

#define RCA_VRD_PWR		0x2A

#define RCA_VRD_PWR_MW		0x2B



#define MEM_HOT_THRESHOLD	0x32

#define SOC_VR_HOT_THRESHOLD	0x33

#define CORE_VRD_VOLT		0x34

#define SOC_VRD_VOLT		0x35

#define DIMM_VRD1_VOLT		0x36

#define DIMM_VRD2_VOLT		0x37

#define RCA_VRD_VOLT		0x38



#define CORE_VRD_CURR		0x39

#define SOC_VRD_CURR		0x3A

#define DIMM_VRD1_CURR		0x3B

#define DIMM_VRD2_CURR		0x3C

#define RCA_VRD_CURR		0x3D



struct smpro_hwmon {

	struct regmap *regmap;

};



struct smpro_sensor {

	const u8 reg;

	const u8 reg_ext;

	const char *label;

};



static const struct smpro_sensor temperature[] = {

	{

		.reg = SOC_TEMP,

		.label = "temp1 SoC"

	},

	{

		.reg = SOC_VRD_TEMP,

		.reg_ext = SOC_VR_HOT_THRESHOLD,

		.label = "temp2 SoC VRD"

	},

	{

		.reg = DIMM_VRD_TEMP,

		.label = "temp3 DIMM VRD"

	},

	{

		.reg = CORE_VRD_TEMP,

		.label = "temp4 CORE VRD"

	},

	{

		.reg = CH0_DIMM_TEMP,

		.reg_ext = MEM_HOT_THRESHOLD,

		.label = "temp5 CH0 DIMM"

	},

	{

		.reg = CH1_DIMM_TEMP,

		.reg_ext = MEM_HOT_THRESHOLD,

		.label = "temp6 CH1 DIMM"

	},

	{

		.reg = CH2_DIMM_TEMP,

		.reg_ext = MEM_HOT_THRESHOLD,

		.label = "temp7 CH2 DIMM"

	},

	{

		.reg = CH3_DIMM_TEMP,

		.reg_ext = MEM_HOT_THRESHOLD,

		.label = "temp8 CH3 DIMM"

	},

	{

		.reg = CH4_DIMM_TEMP,

		.reg_ext = MEM_HOT_THRESHOLD,

		.label = "temp9 CH4 DIMM"

	},

	{

		.reg = CH5_DIMM_TEMP,

		.reg_ext = MEM_HOT_THRESHOLD,

		.label = "temp10 CH5 DIMM"

	},

	{

		.reg = CH6_DIMM_TEMP,

		.reg_ext = MEM_HOT_THRESHOLD,

		.label = "temp11 CH6 DIMM"

	},

	{

		.reg = CH7_DIMM_TEMP,

		.reg_ext = MEM_HOT_THRESHOLD,

		.label = "temp12 CH7 DIMM"

	},

	{

		.reg = RCA_VRD_TEMP,

		.label = "temp13 RCA VRD"

	},

};



static const struct smpro_sensor voltage[] = {

	{

		.reg = CORE_VRD_VOLT,

		.label = "vout0 CORE VRD"

	},

	{

		.reg = SOC_VRD_VOLT,

		.label = "vout1 SoC VRD"

	},

	{

		.reg = DIMM_VRD1_VOLT,

		.label = "vout2 DIMM VRD1"

	},

	{

		.reg = DIMM_VRD2_VOLT,

		.label = "vout3 DIMM VRD2"

	},

	{

		.reg = RCA_VRD_VOLT,

		.label = "vout4 RCA VRD"

	},

};



static const struct smpro_sensor curr_sensor[] = {

	{

		.reg = CORE_VRD_CURR,

		.label = "iout1 CORE VRD"

	},

	{

		.reg = SOC_VRD_CURR,

		.label = "iout2 SoC VRD"

	},

	{

		.reg = DIMM_VRD1_CURR,

		.label = "iout3 DIMM VRD1"

	},

	{

		.reg = DIMM_VRD2_CURR,

		.label = "iout4 DIMM VRD2"

	},

	{

		.reg = RCA_VRD_CURR,

		.label = "iout5 RCA VRD"

	},

};



static const struct smpro_sensor power[] = {

	{

		.reg = CORE_VRD_PWR,

		.reg_ext = CORE_VRD_PWR_MW,

		.label = "power1 CORE VRD"

	},

	{

		.reg = SOC_PWR,

		.reg_ext = SOC_PWR_MW,

		.label = "power2 SoC"

	},

	{

		.reg = DIMM_VRD1_PWR,

		.reg_ext = DIMM_VRD1_PWR_MW,

		.label = "power3 DIMM VRD1"

	},

	{

		.reg = DIMM_VRD2_PWR,

		.reg_ext = DIMM_VRD2_PWR_MW,

		.label = "power4 DIMM VRD2"

	},

	{

		.reg = RCA_VRD_PWR,

		.reg_ext = RCA_VRD_PWR_MW,

		.label = "power5 RCA VRD"

	},

};



static int smpro_read_temp(struct device *dev, u32 attr, int channel, long *val)

{

	struct smpro_hwmon *hwmon = dev_get_drvdata(dev);

	unsigned int value;

	int ret;



	switch (attr) {

	case hwmon_temp_input:

		ret = regmap_read(hwmon->regmap, temperature[channel].reg, &value);

		if (ret)

			return ret;

		break;

	case hwmon_temp_crit:

		ret = regmap_read(hwmon->regmap, temperature[channel].reg_ext, &value);

		if (ret)

			return ret;

		break;

	default:

		return -EOPNOTSUPP;

	}



	*val = sign_extend32(value, 8) * 1000;

	return 0;

}



static int smpro_read_in(struct device *dev, u32 attr, int channel, long *val)

{

	struct smpro_hwmon *hwmon = dev_get_drvdata(dev);

	unsigned int value;

	int ret;



	switch (attr) {

	case hwmon_in_input:

		ret = regmap_read(hwmon->regmap, voltage[channel].reg, &value);

		if (ret < 0)

			return ret;

		/* 15-bit value in 1mV */

		*val = value & 0x7fff;

		return 0;

	default:

		return -EOPNOTSUPP;

	}

}



static int smpro_read_curr(struct device *dev, u32 attr, int channel, long *val)

{

	struct smpro_hwmon *hwmon = dev_get_drvdata(dev);

	unsigned int value;

	int ret;



	switch (attr) {

	case hwmon_curr_input:

		ret = regmap_read(hwmon->regmap, curr_sensor[channel].reg, &value);

		if (ret < 0)

			return ret;

		/* Scale reported by the hardware is 1mA */

		*val = value & 0x7fff;

		return 0;

	default:

		return -EOPNOTSUPP;

	}

}



static int smpro_read_power(struct device *dev, u32 attr, int channel, long *val_pwr)

{

	struct smpro_hwmon *hwmon = dev_get_drvdata(dev);

	unsigned int val = 0, val_mw = 0;

	int ret;



	switch (attr) {

	case hwmon_power_input:

		ret = regmap_read(hwmon->regmap, power[channel].reg, &val);

		if (ret)

			return ret;



		ret = regmap_read(hwmon->regmap, power[channel].reg_ext, &val_mw);

		if (ret)

			return ret;

		/* 10-bit value */

		*val_pwr = (val & 0x3ff) * 1000000 + (val_mw & 0x3ff) * 1000;

		return 0;



	default:

		return -EOPNOTSUPP;

	}

}



static int smpro_read(struct device *dev, enum hwmon_sensor_types type,

		      u32 attr, int channel, long *val)

{

	switch (type) {

	case hwmon_temp:

		return smpro_read_temp(dev, attr, channel, val);

	case hwmon_in:

		return smpro_read_in(dev, attr, channel, val);

	case hwmon_power:

		return smpro_read_power(dev, attr, channel, val);

	case hwmon_curr:

		return smpro_read_curr(dev, attr, channel, val);

	default:

		return -EOPNOTSUPP;

	}

}



static int smpro_read_string(struct device *dev, enum hwmon_sensor_types type,

			     u32 attr, int channel, const char **str)

{

	switch (type) {

	case hwmon_temp:

		switch (attr) {

		case hwmon_temp_label:

			*str = temperature[channel].label;

			return 0;

		default:

			break;

		}

		break;



	case hwmon_in:

		switch (attr) {

		case hwmon_in_label:

			*str = voltage[channel].label;

			return 0;

		default:

			break;

		}

		break;



	case hwmon_curr:

		switch (attr) {

		case hwmon_curr_label:

			*str = curr_sensor[channel].label;

			return 0;

		default:

			break;

		}

		break;



	case hwmon_power:

		switch (attr) {

		case hwmon_power_label:

			*str = power[channel].label;

			return 0;

		default:

			break;

		}

		break;

	default:

		break;

	}



	return -EOPNOTSUPP;

}



static umode_t smpro_is_visible(const void *data, enum hwmon_sensor_types type,

				u32 attr, int channel)

{

	const struct smpro_hwmon *hwmon = data;

	unsigned int value;

	int ret;



	switch (type) {

	case hwmon_temp:

		switch (attr) {

		case hwmon_temp_input:

		case hwmon_temp_label:

		case hwmon_temp_crit:

			ret = regmap_read(hwmon->regmap, temperature[channel].reg, &value);

			if (ret || value == 0xFFFF)

				return 0;

		break;

		}

	default:

		break;

	}



	return 0444;

}



static const struct hwmon_channel_info *smpro_info[] = {

	HWMON_CHANNEL_INFO(temp,

			   HWMON_T_INPUT | HWMON_T_LABEL,

			   HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT,

			   HWMON_T_INPUT | HWMON_T_LABEL,

			   HWMON_T_INPUT | HWMON_T_LABEL,

			   HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT,

			   HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT,

			   HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT,

			   HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT,

			   HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT,

			   HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT,

			   HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT,

			   HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT,

			   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_CHANNEL_INFO(power,

			   HWMON_P_INPUT | HWMON_P_LABEL,

			   HWMON_P_INPUT | HWMON_P_LABEL,

			   HWMON_P_INPUT | HWMON_P_LABEL,

			   HWMON_P_INPUT | HWMON_P_LABEL,

			   HWMON_P_INPUT | HWMON_P_LABEL),

	HWMON_CHANNEL_INFO(curr,

			   HWMON_C_INPUT | HWMON_C_LABEL,

			   HWMON_C_INPUT | HWMON_C_LABEL,

			   HWMON_C_INPUT | HWMON_C_LABEL,

			   HWMON_C_INPUT | HWMON_C_LABEL,

			   HWMON_C_INPUT | HWMON_C_LABEL),

	NULL

};



static const struct hwmon_ops smpro_hwmon_ops = {

	.is_visible = smpro_is_visible,

	.read = smpro_read,

	.read_string = smpro_read_string,

};



static const struct hwmon_chip_info smpro_chip_info = {

	.ops = &smpro_hwmon_ops,

	.info = smpro_info,

};



static int smpro_hwmon_probe(struct platform_device *pdev)

{

	struct smpro_hwmon *hwmon;

	struct device *hwmon_dev;



	hwmon = devm_kzalloc(&pdev->dev, sizeof(struct smpro_hwmon), GFP_KERNEL);

	if (!hwmon)

		return -ENOMEM;



	hwmon->regmap = dev_get_regmap(pdev->dev.parent, NULL);

	if (!hwmon->regmap)

		return -ENODEV;



	hwmon_dev = devm_hwmon_device_register_with_info(&pdev->dev, "smpro_hwmon",

							 hwmon, &smpro_chip_info, NULL);



	return PTR_ERR_OR_ZERO(hwmon_dev);

}



static struct platform_driver smpro_hwmon_driver = {

	.probe		= smpro_hwmon_probe,

	.driver = {

		.name	= "smpro-hwmon",

	},

};



module_platform_driver(smpro_hwmon_driver);



MODULE_AUTHOR("Thu Nguyen <thu@os.amperecomputing.com>");

MODULE_AUTHOR("Quan Nguyen <quan@os.amperecomputing.com>");

MODULE_DESCRIPTION("Ampere Altra SMPro hwmon driver");

MODULE_LICENSE("GPL");