Message-Id: <20180521195952.28073-1-jae.hyun.yoo@linux.intel.com>
Date:   Mon, 21 May 2018 12:59:52 -0700
From:   Jae Hyun Yoo <jae.hyun.yoo@...ux.intel.com>
To:     Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Jason M Biils <jason.m.bills@...ux.intel.com>,
        linux-kernel@...r.kernel.org, linux-hwmon@...r.kernel.org
Cc:     Jae Hyun Yoo <jae.hyun.yoo@...ux.intel.com>,
        Alan Cox <alan@...ux.intel.com>,
        Andrew Jeffery <andrew@...id.au>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Arnd Bergmann <arnd@...db.de>, Joel Stanley <joel@....id.au>,
        Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Stef van Os <stef.van.os@...drive-technologies.com>
Subject: [v4 09/11] drivers/hwmon: Add PECI cputemp driver

This commit adds PECI cputemp hwmon driver.

Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo@...ux.intel.com>
Reviewed-by: Haiyue Wang <haiyue.wang@...ux.intel.com>
Reviewed-by: James Feist <james.feist@...ux.intel.com>
Reviewed-by: Vernon Mauery <vernon.mauery@...ux.intel.com>
Cc: Alan Cox <alan@...ux.intel.com>
Cc: Andrew Jeffery <andrew@...id.au>
Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: Jason M Biils <jason.m.bills@...ux.intel.com>
Cc: Joel Stanley <joel@....id.au>
Cc: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Cc: Andrew Lunn <andrew@...n.ch>
Cc: Stef van Os <stef.van.os@...drive-technologies.com>
---
 drivers/hwmon/Kconfig        |  14 ++
 drivers/hwmon/Makefile       |   1 +
 drivers/hwmon/peci-cputemp.c | 407 +++++++++++++++++++++++++++++++++++
 drivers/hwmon/peci-hwmon.c   | 124 +++++++++++
 drivers/hwmon/peci-hwmon.h   |  51 +++++
 5 files changed, 597 insertions(+)
 create mode 100644 drivers/hwmon/peci-cputemp.c
 create mode 100644 drivers/hwmon/peci-hwmon.c
 create mode 100644 drivers/hwmon/peci-hwmon.h

diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index f10840ad465c..8492586bb1e4 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -1256,6 +1256,20 @@ config SENSORS_NCT7904
 	  This driver can also be built as a module.  If so, the module
 	  will be called nct7904.
 
+config SENSORS_PECI_CPUTEMP
+	tristate "PECI CPU temperature monitoring support"
+	depends on OF
+	depends on PECI
+	help
+	  If you say yes here you get support for the generic Intel PECI
+	  cputemp driver which provides Digital Thermal Sensor (DTS) thermal
+	  readings of the CPU package and CPU cores that are accessible using
+	  the PECI Client Command Suite via the processor PECI client.
+	  Check Documentation/hwmon/peci-cputemp for details.
+
+	  This driver can also be built as a module.  If so, the module
+	  will be called peci-cputemp.
+
 config SENSORS_NSA320
 	tristate "ZyXEL NSA320 and compatible fan speed and temperature sensors"
 	depends on GPIOLIB && OF
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index e7d52a36e6c4..d18b374a9000 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -136,6 +136,7 @@ obj-$(CONFIG_SENSORS_NCT7802)	+= nct7802.o
 obj-$(CONFIG_SENSORS_NCT7904)	+= nct7904.o
 obj-$(CONFIG_SENSORS_NSA320)	+= nsa320-hwmon.o
 obj-$(CONFIG_SENSORS_NTC_THERMISTOR)	+= ntc_thermistor.o
+obj-$(CONFIG_SENSORS_PECI_CPUTEMP)	+= peci-cputemp.o peci-hwmon.o
 obj-$(CONFIG_SENSORS_PC87360)	+= pc87360.o
 obj-$(CONFIG_SENSORS_PC87427)	+= pc87427.o
 obj-$(CONFIG_SENSORS_PCF8591)	+= pcf8591.o
diff --git a/drivers/hwmon/peci-cputemp.c b/drivers/hwmon/peci-cputemp.c
new file mode 100644
index 000000000000..49c5a862bb58
--- /dev/null
+++ b/drivers/hwmon/peci-cputemp.c
@@ -0,0 +1,407 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2018 Intel Corporation
+
+#include <linux/hwmon.h>
+#include <linux/jiffies.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+
+#include "peci-hwmon.h"
+
+#define DEFAULT_CHANNEL_NUMS   4
+#define CORETEMP_CHANNEL_NUMS  CORE_NUMS_MAX
+#define CPUTEMP_CHANNEL_NUMS   (DEFAULT_CHANNEL_NUMS + CORETEMP_CHANNEL_NUMS)
+
+/* The RESOLVED_CORES register in PCU of a client CPU */
+#define REG_RESOLVED_CORES_BUS      1
+#define REG_RESOLVED_CORES_DEVICE   30
+#define REG_RESOLVED_CORES_FUNCTION 3
+#define REG_RESOLVED_CORES_OFFSET   0xB4
+
+struct temp_group {
+	struct temp_data die;
+	struct temp_data tcontrol;
+	struct temp_data tthrottle;
+	struct temp_data tjmax;
+	struct temp_data core[CORETEMP_CHANNEL_NUMS];
+};
+
+struct peci_cputemp {
+	struct peci_client *client;
+	struct device *dev;
+	char name[PECI_NAME_SIZE];
+	struct temp_group temp;
+	u8 addr;
+	uint cpu_no;
+	const struct cpu_gen_info *gen_info;
+	u32 core_mask;
+	u32 temp_config[CPUTEMP_CHANNEL_NUMS + 1];
+	uint config_idx;
+	struct hwmon_channel_info temp_info;
+	const struct hwmon_channel_info *info[2];
+	struct hwmon_chip_info chip;
+};
+
+enum cputemp_channels {
+	channel_die,
+	channel_tcontrol,
+	channel_tthrottle,
+	channel_tjmax,
+	channel_core,
+};
+
+static const u32 config_table[DEFAULT_CHANNEL_NUMS + 1] = {
+	/* Die temperature */
+	HWMON_T_LABEL | HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT |
+	HWMON_T_CRIT_HYST,
+
+	/* Tcontrol temperature */
+	HWMON_T_LABEL | HWMON_T_INPUT | HWMON_T_CRIT,
+
+	/* Tthrottle temperature */
+	HWMON_T_LABEL | HWMON_T_INPUT,
+
+	/* Tjmax temperature */
+	HWMON_T_LABEL | HWMON_T_INPUT,
+
+	/* Core temperature - for all core channels */
+	HWMON_T_LABEL | HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT |
+	HWMON_T_CRIT_HYST,
+};
+
+static const char *cputemp_label[CPUTEMP_CHANNEL_NUMS] = {
+	"Die",
+	"Tcontrol",
+	"Tthrottle",
+	"Tjmax",
+	"Core 0", "Core 1", "Core 2", "Core 3",
+	"Core 4", "Core 5", "Core 6", "Core 7",
+	"Core 8", "Core 9", "Core 10", "Core 11",
+	"Core 12", "Core 13", "Core 14", "Core 15",
+	"Core 16", "Core 17", "Core 18", "Core 19",
+	"Core 20", "Core 21", "Core 22", "Core 23",
+};
+
+static s32 ten_dot_six_to_millidegree(s32 val)
+{
+	return ((val ^ 0x8000) - 0x8000) * 1000 / 64;
+}
+
+static int get_temp_targets(struct peci_cputemp *priv)
+{
+	s32 tthrottle_offset;
+	s32 tcontrol_margin;
+	u8  pkg_cfg[4];
+	int rc;
+
+	/**
+	 * Just use only the tcontrol marker to determine if target values need
+	 * update.
+	 */
+	if (!peci_hwmon_need_update(&priv->temp.tcontrol))
+		return 0;
+
+	rc = peci_hwmon_rd_pkg_cfg_cmd(priv->client->adapter, priv->addr,
+				       MBX_INDEX_TEMP_TARGET, 0, pkg_cfg);
+	if (rc)
+		return rc;
+
+	priv->temp.tjmax.value = pkg_cfg[2] * 1000;
+
+	tcontrol_margin = pkg_cfg[1];
+	tcontrol_margin = ((tcontrol_margin ^ 0x80) - 0x80) * 1000;
+	priv->temp.tcontrol.value = priv->temp.tjmax.value - tcontrol_margin;
+
+	tthrottle_offset = (pkg_cfg[3] & 0x2f) * 1000;
+	priv->temp.tthrottle.value = priv->temp.tjmax.value - tthrottle_offset;
+
+	peci_hwmon_mark_updated(&priv->temp.tcontrol);
+
+	return 0;
+}
+
+static int get_die_temp(struct peci_cputemp *priv)
+{
+	struct peci_get_temp_msg msg;
+	int rc;
+
+	if (!peci_hwmon_need_update(&priv->temp.die))
+		return 0;
+
+	msg.addr = priv->addr;
+
+	rc = peci_command(priv->client->adapter, PECI_CMD_GET_TEMP, &msg);
+	if (rc)
+		return rc;
+
+	/* Note that the tjmax should be available before calling it */
+	priv->temp.die.value = priv->temp.tjmax.value +
+			       (msg.temp_raw * 1000 / 64);
+
+	peci_hwmon_mark_updated(&priv->temp.die);
+
+	return 0;
+}
+
+static int get_core_temp(struct peci_cputemp *priv, int core_index)
+{
+	s32 core_dts_margin;
+	u8  pkg_cfg[4];
+	int rc;
+
+	if (!peci_hwmon_need_update(&priv->temp.core[core_index]))
+		return 0;
+
+	rc = peci_hwmon_rd_pkg_cfg_cmd(priv->client->adapter, priv->addr,
+				       MBX_INDEX_PER_CORE_DTS_TEMP,
+				       core_index, pkg_cfg);
+	if (rc)
+		return rc;
+
+	core_dts_margin = le16_to_cpup((__le16 *)pkg_cfg);
+
+	/**
+	 * Processors return a value of the core DTS reading in 10.6 format
+	 * (10 bits signed decimal, 6 bits fractional).
+	 * Error codes:
+	 *   0x8000: General sensor error
+	 *   0x8001: Reserved
+	 *   0x8002: Underflow on reading value
+	 *   0x8003-0x81ff: Reserved
+	 */
+	if (core_dts_margin >= 0x8000 && core_dts_margin <= 0x81ff)
+		return -EIO;
+
+	core_dts_margin = ten_dot_six_to_millidegree(core_dts_margin);
+
+	/* Note that the tjmax should be available before calling it */
+	priv->temp.core[core_index].value = priv->temp.tjmax.value +
+					    core_dts_margin;
+
+	peci_hwmon_mark_updated(&priv->temp.core[core_index]);
+
+	return 0;
+}
+
+static int cputemp_read_string(struct device *dev,
+			       enum hwmon_sensor_types type,
+			       u32 attr, int channel, const char **str)
+{
+	if (attr != hwmon_temp_label)
+		return -EOPNOTSUPP;
+
+	*str = cputemp_label[channel];
+	return 0;
+}
+
+static int cputemp_read(struct device *dev,
+			enum hwmon_sensor_types type,
+			u32 attr, int channel, long *val)
+{
+	struct peci_cputemp *priv = dev_get_drvdata(dev);
+	int rc, core_index;
+
+	if (channel >= CPUTEMP_CHANNEL_NUMS ||
+	    !(priv->temp_config[channel] & BIT(attr)))
+		return -EOPNOTSUPP;
+
+	rc = get_temp_targets(priv);
+	if (rc)
+		return rc;
+
+	switch (attr) {
+	case hwmon_temp_input:
+		switch (channel) {
+		case channel_die:
+			rc = get_die_temp(priv);
+			if (rc)
+				break;
+
+			*val = priv->temp.die.value;
+			break;
+		case channel_tcontrol:
+			*val = priv->temp.tcontrol.value;
+			break;
+		case channel_tthrottle:
+			*val = priv->temp.tthrottle.value;
+			break;
+		case channel_tjmax:
+			*val = priv->temp.tjmax.value;
+			break;
+		default:
+			core_index = channel - DEFAULT_CHANNEL_NUMS;
+			rc = get_core_temp(priv, core_index);
+			if (rc)
+				break;
+
+			*val = priv->temp.core[core_index].value;
+			break;
+		}
+		break;
+	case hwmon_temp_max:
+		*val = priv->temp.tcontrol.value;
+		break;
+	case hwmon_temp_crit:
+		*val = priv->temp.tjmax.value;
+		break;
+	case hwmon_temp_crit_hyst:
+		*val = priv->temp.tjmax.value - priv->temp.tcontrol.value;
+		break;
+	default:
+		rc = -EOPNOTSUPP;
+		break;
+	}
+
+	return rc;
+}
+
+static umode_t cputemp_is_visible(const void *data,
+				  enum hwmon_sensor_types type,
+				  u32 attr, int channel)
+{
+	const struct peci_cputemp *priv = data;
+
+	if (priv->temp_config[channel] & BIT(attr))
+		if (channel < DEFAULT_CHANNEL_NUMS ||
+		    (channel >= DEFAULT_CHANNEL_NUMS &&
+		     (priv->core_mask & BIT(channel - DEFAULT_CHANNEL_NUMS))))
+			return 0444;
+
+	return 0;
+}
+
+static const struct hwmon_ops cputemp_ops = {
+	.is_visible = cputemp_is_visible,
+	.read_string = cputemp_read_string,
+	.read = cputemp_read,
+};
+
+static int check_resolved_cores(struct peci_cputemp *priv)
+{
+	struct peci_rd_pci_cfg_local_msg msg;
+	int rc;
+
+	/* Get the RESOLVED_CORES register value */
+	msg.addr = priv->addr;
+	msg.bus = REG_RESOLVED_CORES_BUS;
+	msg.device = REG_RESOLVED_CORES_DEVICE;
+	msg.function = REG_RESOLVED_CORES_FUNCTION;
+	msg.reg = REG_RESOLVED_CORES_OFFSET;
+	msg.rx_len = 4;
+
+	rc = peci_command(priv->client->adapter, PECI_CMD_RD_PCI_CFG_LOCAL,
+			  &msg);
+	if (rc)
+		return rc;
+
+	priv->core_mask = le32_to_cpup((__le32 *)msg.pci_config);
+	if (!priv->core_mask)
+		return -EAGAIN;
+
+	dev_dbg(priv->dev, "Scanned resolved cores: 0x%x\n", priv->core_mask);
+	return 0;
+}
+
+static int create_core_temp_info(struct peci_cputemp *priv)
+{
+	int rc, i;
+
+	rc = check_resolved_cores(priv);
+	if (rc)
+		return rc;
+
+	for (i = 0; i < priv->gen_info->core_max; i++)
+		if (priv->core_mask & BIT(i))
+			while (i + DEFAULT_CHANNEL_NUMS >= priv->config_idx)
+				priv->temp_config[priv->config_idx++] =
+					config_table[channel_core];
+
+	return 0;
+}
+
+static int peci_cputemp_probe(struct peci_client *client)
+{
+	struct device *dev = &client->dev;
+	struct peci_cputemp *priv;
+	struct device *hwmon_dev;
+	int rc;
+
+	if ((client->adapter->cmd_mask &
+	    (BIT(PECI_CMD_GET_TEMP) | BIT(PECI_CMD_RD_PKG_CFG))) !=
+	    (BIT(PECI_CMD_GET_TEMP) | BIT(PECI_CMD_RD_PKG_CFG)))
+		return -ENODEV;
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	dev_set_drvdata(dev, priv);
+	priv->client = client;
+	priv->dev = dev;
+	priv->addr = client->addr;
+	priv->cpu_no = priv->addr - PECI_BASE_ADDR;
+
+	snprintf(priv->name, PECI_NAME_SIZE, "peci_cputemp.cpu%d",
+		 priv->cpu_no);
+
+	rc = peci_hwmon_get_cpu_gen_info(client->adapter, priv->addr,
+					 &priv->gen_info);
+	if (rc)
+		return rc;
+
+	priv->temp_config[priv->config_idx++] = config_table[channel_die];
+	priv->temp_config[priv->config_idx++] = config_table[channel_tcontrol];
+	priv->temp_config[priv->config_idx++] = config_table[channel_tthrottle];
+	priv->temp_config[priv->config_idx++] = config_table[channel_tjmax];
+
+	rc = create_core_temp_info(priv);
+	if (rc)
+		dev_dbg(dev, "Skipped creating core temp info\n");
+
+	priv->chip.ops = &cputemp_ops;
+	priv->chip.info = priv->info;
+
+	priv->info[0] = &priv->temp_info;
+
+	priv->temp_info.type = hwmon_temp;
+	priv->temp_info.config = priv->temp_config;
+
+	hwmon_dev = devm_hwmon_device_register_with_info(priv->dev,
+							 priv->name,
+							 priv,
+							 &priv->chip,
+							 NULL);
+
+	if (IS_ERR(hwmon_dev))
+		return PTR_ERR(hwmon_dev);
+
+	dev_dbg(dev, "%s: sensor '%s'\n", dev_name(hwmon_dev), priv->name);
+
+	return 0;
+}
+
+static const struct of_device_id peci_cputemp_of_table[] = {
+	{ .compatible = "intel,peci-cputemp" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, peci_cputemp_of_table);
+
+static const struct peci_device_id peci_cputemp_ids[] = {
+	{ "peci-cputemp", 0, },
+	{ }
+};
+MODULE_DEVICE_TABLE(peci, peci_cputemp_ids);
+
+static struct peci_driver peci_cputemp_driver = {
+	.probe    = peci_cputemp_probe,
+	.id_table = peci_cputemp_ids,
+	.driver   = {
+			.name           = "peci-cputemp",
+			.of_match_table = of_match_ptr(peci_cputemp_of_table),
+	},
+};
+module_peci_driver(peci_cputemp_driver);
+
+MODULE_AUTHOR("Jae Hyun Yoo <jae.hyun.yoo@...ux.intel.com>");
+MODULE_DESCRIPTION("PECI cputemp driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/hwmon/peci-hwmon.c b/drivers/hwmon/peci-hwmon.c
new file mode 100644
index 000000000000..e137e301eb97
--- /dev/null
+++ b/drivers/hwmon/peci-hwmon.c
@@ -0,0 +1,124 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2018 Intel Corporation
+
+#include <linux/bitfield.h>
+#include <linux/module.h>
+#include <linux/peci.h>
+
+#include "peci-hwmon.h"
+
+#if IS_ENABLED(CONFIG_X86)
+#include <asm/intel-family.h>
+#else
+#define INTEL_FAM6_HASWELL_X   0x3F
+#define INTEL_FAM6_BROADWELL_X 0x4F
+#define INTEL_FAM6_SKYLAKE_X   0x55
+#endif
+
+#define LOWER_NIBBLE_MASK      GENMASK(3, 0)
+#define UPPER_NIBBLE_MASK      GENMASK(7, 4)
+
+#define CPU_ID_MODEL_MASK      GENMASK(7, 4)
+#define CPU_ID_FAMILY_MASK     GENMASK(11, 8)
+#define CPU_ID_EXT_MODEL_MASK  GENMASK(19, 16)
+#define CPU_ID_EXT_FAMILY_MASK GENMASK(27, 20)
+
+enum cpu_gens {
+	CPU_GEN_HSX = 0, /* Haswell Xeon */
+	CPU_GEN_BRX,     /* Broadwell Xeon */
+	CPU_GEN_SKX,     /* Skylake Xeon */
+};
+
+static const struct cpu_gen_info cpu_gen_info_table[] = {
+	[CPU_GEN_HSX] = {
+		.family        = 6, /* Family code */
+		.model         = INTEL_FAM6_HASWELL_X,
+		.core_max      = CORE_MAX_ON_HSX,
+		.chan_rank_max = CHAN_RANK_MAX_ON_HSX,
+		.dimm_idx_max  = DIMM_IDX_MAX_ON_HSX },
+	[CPU_GEN_BRX] = {
+		.family        = 6, /* Family code */
+		.model         = INTEL_FAM6_BROADWELL_X,
+		.core_max      = CORE_MAX_ON_BDX,
+		.chan_rank_max = CHAN_RANK_MAX_ON_BDX,
+		.dimm_idx_max  = DIMM_IDX_MAX_ON_BDX },
+	[CPU_GEN_SKX] = {
+		.family        = 6, /* Family code */
+		.model         = INTEL_FAM6_SKYLAKE_X,
+		.core_max      = CORE_MAX_ON_SKX,
+		.chan_rank_max = CHAN_RANK_MAX_ON_SKX,
+		.dimm_idx_max  = DIMM_IDX_MAX_ON_SKX },
+};
+
+int peci_hwmon_get_cpu_gen_info(struct peci_adapter *adapter, u8 addr,
+				const struct cpu_gen_info **gen_info)
+{
+	u32 cpu_id;
+	int i, rc;
+
+	rc = peci_get_cpu_id(adapter, addr, &cpu_id);
+	if (rc)
+		return rc;
+
+	for (i = 0; i < ARRAY_SIZE(cpu_gen_info_table); i++) {
+		if (FIELD_GET(CPU_ID_FAMILY_MASK, cpu_id) +
+			FIELD_GET(CPU_ID_EXT_FAMILY_MASK, cpu_id) ==
+				cpu_gen_info_table[i].family &&
+		    FIELD_GET(CPU_ID_MODEL_MASK, cpu_id) ==
+			FIELD_GET(LOWER_NIBBLE_MASK,
+				  cpu_gen_info_table[i].model) &&
+		    FIELD_GET(CPU_ID_EXT_MODEL_MASK, cpu_id) ==
+			FIELD_GET(UPPER_NIBBLE_MASK,
+				  cpu_gen_info_table[i].model)) {
+			break;
+		}
+	}
+
+	if (i >= ARRAY_SIZE(cpu_gen_info_table))
+		return -ENODEV;
+
+	*gen_info = &cpu_gen_info_table[i];
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(peci_hwmon_get_cpu_gen_info);
+
+bool peci_hwmon_need_update(struct temp_data *temp)
+{
+	if (temp->valid &&
+	    time_before(jiffies, temp->last_updated + UPDATE_INTERVAL))
+		return false;
+
+	return true;
+}
+EXPORT_SYMBOL_GPL(peci_hwmon_need_update);
+
+void peci_hwmon_mark_updated(struct temp_data *temp)
+{
+	temp->valid = 1;
+	temp->last_updated = jiffies;
+}
+EXPORT_SYMBOL_GPL(peci_hwmon_mark_updated);
+
+int peci_hwmon_rd_pkg_cfg_cmd(struct peci_adapter *adapter, u8 addr,
+			      u8 mbx_idx, u16 param, u8 *data)
+{
+	struct peci_rd_pkg_cfg_msg msg;
+	int rc;
+
+	msg.addr = addr;
+	msg.index = mbx_idx;
+	msg.param = param;
+	msg.rx_len = 4;
+
+	rc = peci_command(adapter, PECI_CMD_RD_PKG_CFG, &msg);
+	if (!rc)
+		memcpy(data, msg.pkg_config, 4);
+
+	return rc;
+}
+EXPORT_SYMBOL_GPL(peci_hwmon_rd_pkg_cfg_cmd);
+
+MODULE_AUTHOR("Jae Hyun Yoo <jae.hyun.yoo@...ux.intel.com>");
+MODULE_DESCRIPTION("PECI hwmon module");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/hwmon/peci-hwmon.h b/drivers/hwmon/peci-hwmon.h
new file mode 100644
index 000000000000..0896c27f33d8
--- /dev/null
+++ b/drivers/hwmon/peci-hwmon.h
@@ -0,0 +1,51 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (c) 2018 Intel Corporation */
+
+#ifndef __PECI_HWMON_H
+#define __PECI_HWMON_H
+
+#include <linux/peci.h>
+
+#define TEMP_TYPE_PECI         6 /* Sensor type 6: Intel PECI */
+
+#define UPDATE_INTERVAL        HZ
+
+struct temp_data {
+	uint  valid;
+	s32   value;
+	ulong last_updated;
+};
+
+struct cpu_gen_info {
+	u16  family;
+	u8   model;
+	uint core_max;
+	uint chan_rank_max;
+	uint dimm_idx_max;
+};
+
+#define CORE_MAX_ON_HSX        18 /* Max number of cores on Haswell */
+#define CHAN_RANK_MAX_ON_HSX   8  /* Max number of channel ranks on Haswell */
+#define DIMM_IDX_MAX_ON_HSX    3  /* Max DIMM index per channel on Haswell */
+
+#define CORE_MAX_ON_BDX        24 /* Max number of cores on Broadwell */
+#define CHAN_RANK_MAX_ON_BDX   4  /* Max number of channel ranks on Broadwell */
+#define DIMM_IDX_MAX_ON_BDX    3  /* Max DIMM index per channel on Broadwell */
+
+#define CORE_MAX_ON_SKX        28 /* Max number of cores on Skylake */
+#define CHAN_RANK_MAX_ON_SKX   6  /* Max number of channel ranks on Skylake */
+#define DIMM_IDX_MAX_ON_SKX    2  /* Max DIMM index per channel on Skylake */
+
+#define CORE_NUMS_MAX          CORE_MAX_ON_SKX
+#define CHAN_RANK_MAX          CHAN_RANK_MAX_ON_HSX
+#define DIMM_IDX_MAX           DIMM_IDX_MAX_ON_HSX
+#define DIMM_NUMS_MAX          (CHAN_RANK_MAX * DIMM_IDX_MAX)
+
+int  peci_hwmon_get_cpu_gen_info(struct peci_adapter *adapter, u8 addr,
+				 const struct cpu_gen_info **gen_info);
+bool peci_hwmon_need_update(struct temp_data *temp);
+void peci_hwmon_mark_updated(struct temp_data *temp);
+int  peci_hwmon_rd_pkg_cfg_cmd(struct peci_adapter *adapter, u8 addr,
+			       u8 mbx_idx, u16 param, u8 *data);
+
+#endif /* __PECI_HWMON_H */
-- 
2.17.0

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