igb: Enable hwmon data output for thermal sensors via I2C.

Some of our adapters have internal sensors that report thermal data.  This
patch enables reporting of that data via sysfs.

Signed-off-by: Carolyn Wyborny <carolyn.wyborny@intel.com>
Tested-by: Jeff Pieper <jeffrey.e.pieper@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/Kconfig

@@ -114,6 +114,17 @@ config IGB
 	  To compile this driver as a module, choose M here. The module
 	  will be called igb.
 
+config IGB_HWMON
+	bool "Intel(R) PCI-Express Gigabit adapters HWMON support"
+	default y
+	depends on IGB && HWMON && !(IGB=y && HWMON=m)
+	---help---
+	  Say Y if you want to expose thermal sensor data on Intel devices.
+
+	  Some of our devices contain thermal sensors, both external and internal.
+	  This data is available via the hwmon sysfs interface and exposes
+	  the onboard sensors.
+
 config IGB_DCA
 	bool "Direct Cache Access (DCA) Support"
 	default y

drivers/net/ethernet/intel/igb/Makefile

@@ -34,4 +34,4 @@ obj-$(CONFIG_IGB) += igb.o
 
 igb-objs := igb_main.o igb_ethtool.o e1000_82575.o \
 	    e1000_mac.o e1000_nvm.o e1000_phy.o e1000_mbx.o \
-	    e1000_i210.o igb_ptp.o
+	    e1000_i210.o igb_ptp.o igb_hwmon.o

drivers/net/ethernet/intel/igb/e1000_82575.c

@@ -2303,12 +2303,149 @@ s32 igb_set_eee_i350(struct e1000_hw *hw)
 	return ret_val;
 }
 
+static const u8 e1000_emc_temp_data[4] = {
+	E1000_EMC_INTERNAL_DATA,
+	E1000_EMC_DIODE1_DATA,
+	E1000_EMC_DIODE2_DATA,
+	E1000_EMC_DIODE3_DATA
+};
+static const u8 e1000_emc_therm_limit[4] = {
+	E1000_EMC_INTERNAL_THERM_LIMIT,
+	E1000_EMC_DIODE1_THERM_LIMIT,
+	E1000_EMC_DIODE2_THERM_LIMIT,
+	E1000_EMC_DIODE3_THERM_LIMIT
+};
+
+/* igb_get_thermal_sensor_data_generic - Gathers thermal sensor data
+ *  @hw: pointer to hardware structure
+ *
+ *  Updates the temperatures in mac.thermal_sensor_data
+ */
+s32 igb_get_thermal_sensor_data_generic(struct e1000_hw *hw)
+{
+	s32 status = E1000_SUCCESS;
+	u16 ets_offset;
+	u16 ets_cfg;
+	u16 ets_sensor;
+	u8  num_sensors;
+	u8  sensor_index;
+	u8  sensor_location;
+	u8  i;
+	struct e1000_thermal_sensor_data *data = &hw->mac.thermal_sensor_data;
+
+	if ((hw->mac.type != e1000_i350) || (hw->bus.func != 0))
+		return E1000_NOT_IMPLEMENTED;
+
+	data->sensor[0].temp = (rd32(E1000_THMJT) & 0xFF);
+
+	/* Return the internal sensor only if ETS is unsupported */
+	hw->nvm.ops.read(hw, NVM_ETS_CFG, 1, &ets_offset);
+	if ((ets_offset == 0x0000) || (ets_offset == 0xFFFF))
+		return status;
+
+	hw->nvm.ops.read(hw, ets_offset, 1, &ets_cfg);
+	if (((ets_cfg & NVM_ETS_TYPE_MASK) >> NVM_ETS_TYPE_SHIFT)
+	    != NVM_ETS_TYPE_EMC)
+		return E1000_NOT_IMPLEMENTED;
+
+	num_sensors = (ets_cfg & NVM_ETS_NUM_SENSORS_MASK);
+	if (num_sensors > E1000_MAX_SENSORS)
+		num_sensors = E1000_MAX_SENSORS;
+
+	for (i = 1; i < num_sensors; i++) {
+		hw->nvm.ops.read(hw, (ets_offset + i), 1, &ets_sensor);
+		sensor_index = ((ets_sensor & NVM_ETS_DATA_INDEX_MASK) >>
+				NVM_ETS_DATA_INDEX_SHIFT);
+		sensor_location = ((ets_sensor & NVM_ETS_DATA_LOC_MASK) >>
+				   NVM_ETS_DATA_LOC_SHIFT);
+
+		if (sensor_location != 0)
+			hw->phy.ops.read_i2c_byte(hw,
+					e1000_emc_temp_data[sensor_index],
+					E1000_I2C_THERMAL_SENSOR_ADDR,
+					&data->sensor[i].temp);
+	}
+	return status;
+}
+
+/* igb_init_thermal_sensor_thresh_generic - Sets thermal sensor thresholds
+ *  @hw: pointer to hardware structure
+ *
+ *  Sets the thermal sensor thresholds according to the NVM map
+ *  and save off the threshold and location values into mac.thermal_sensor_data
+ */
+s32 igb_init_thermal_sensor_thresh_generic(struct e1000_hw *hw)
+{
+	s32 status = E1000_SUCCESS;
+	u16 ets_offset;
+	u16 ets_cfg;
+	u16 ets_sensor;
+	u8  low_thresh_delta;
+	u8  num_sensors;
+	u8  sensor_index;
+	u8  sensor_location;
+	u8  therm_limit;
+	u8  i;
+	struct e1000_thermal_sensor_data *data = &hw->mac.thermal_sensor_data;
+
+	if ((hw->mac.type != e1000_i350) || (hw->bus.func != 0))
+		return E1000_NOT_IMPLEMENTED;
+
+	memset(data, 0, sizeof(struct e1000_thermal_sensor_data));
+
+	data->sensor[0].location = 0x1;
+	data->sensor[0].caution_thresh =
+		(rd32(E1000_THHIGHTC) & 0xFF);
+	data->sensor[0].max_op_thresh =
+		(rd32(E1000_THLOWTC) & 0xFF);
+
+	/* Return the internal sensor only if ETS is unsupported */
+	hw->nvm.ops.read(hw, NVM_ETS_CFG, 1, &ets_offset);
+	if ((ets_offset == 0x0000) || (ets_offset == 0xFFFF))
+		return status;
+
+	hw->nvm.ops.read(hw, ets_offset, 1, &ets_cfg);
+	if (((ets_cfg & NVM_ETS_TYPE_MASK) >> NVM_ETS_TYPE_SHIFT)
+	    != NVM_ETS_TYPE_EMC)
+		return E1000_NOT_IMPLEMENTED;
+
+	low_thresh_delta = ((ets_cfg & NVM_ETS_LTHRES_DELTA_MASK) >>
+			    NVM_ETS_LTHRES_DELTA_SHIFT);
+	num_sensors = (ets_cfg & NVM_ETS_NUM_SENSORS_MASK);
+
+	for (i = 1; i <= num_sensors; i++) {
+		hw->nvm.ops.read(hw, (ets_offset + i), 1, &ets_sensor);
+		sensor_index = ((ets_sensor & NVM_ETS_DATA_INDEX_MASK) >>
+				NVM_ETS_DATA_INDEX_SHIFT);
+		sensor_location = ((ets_sensor & NVM_ETS_DATA_LOC_MASK) >>
+				   NVM_ETS_DATA_LOC_SHIFT);
+		therm_limit = ets_sensor & NVM_ETS_DATA_HTHRESH_MASK;
+
+		hw->phy.ops.write_i2c_byte(hw,
+			e1000_emc_therm_limit[sensor_index],
+			E1000_I2C_THERMAL_SENSOR_ADDR,
+			therm_limit);
+
+		if ((i < E1000_MAX_SENSORS) && (sensor_location != 0)) {
+			data->sensor[i].location = sensor_location;
+			data->sensor[i].caution_thresh = therm_limit;
+			data->sensor[i].max_op_thresh = therm_limit -
+							low_thresh_delta;
+		}
+	}
+	return status;
+}
+
 static struct e1000_mac_operations e1000_mac_ops_82575 = {
 	.init_hw              = igb_init_hw_82575,
 	.check_for_link       = igb_check_for_link_82575,
 	.rar_set              = igb_rar_set,
 	.read_mac_addr        = igb_read_mac_addr_82575,
 	.get_speed_and_duplex = igb_get_speed_and_duplex_copper,
+#ifdef CONFIG_IGB_HWMON
+	.get_thermal_sensor_data = igb_get_thermal_sensor_data_generic,
+	.init_thermal_sensor_thresh = igb_init_thermal_sensor_thresh_generic,
+#endif
 };
 
 static struct e1000_phy_operations e1000_phy_ops_82575 = {

drivers/net/ethernet/intel/igb/e1000_82575.h

@@ -264,6 +264,8 @@ void igb_vmdq_set_loopback_pf(struct e1000_hw *, bool);
 void igb_vmdq_set_replication_pf(struct e1000_hw *, bool);
 u16 igb_rxpbs_adjust_82580(u32 data);
 s32 igb_set_eee_i350(struct e1000_hw *);
+s32 igb_init_thermal_sensor_thresh_generic(struct e1000_hw *);
+s32 igb_get_thermal_sensor_data_generic(struct e1000_hw *hw);
 
 #define E1000_I2C_THERMAL_SENSOR_ADDR	0xF8
 #define E1000_EMC_INTERNAL_DATA		0x00

drivers/net/ethernet/intel/igb/e1000_hw.h

@@ -325,6 +325,10 @@ struct e1000_mac_operations {
 	s32  (*get_speed_and_duplex)(struct e1000_hw *, u16 *, u16 *);
 	s32  (*acquire_swfw_sync)(struct e1000_hw *, u16);
 	void (*release_swfw_sync)(struct e1000_hw *, u16);
+#ifdef CONFIG_IGB_HWMON
+	s32 (*get_thermal_sensor_data)(struct e1000_hw *);
+	s32 (*init_thermal_sensor_thresh)(struct e1000_hw *);
+#endif
 
 };
 

drivers/net/ethernet/intel/igb/igb.h

@@ -308,6 +308,27 @@ struct igb_i2c_client_list {
 	struct igb_i2c_client_list *next;
 };
 
+#ifdef CONFIG_IGB_HWMON
+
+#define IGB_HWMON_TYPE_LOC	0
+#define IGB_HWMON_TYPE_TEMP	1
+#define IGB_HWMON_TYPE_CAUTION	2
+#define IGB_HWMON_TYPE_MAX	3
+
+struct hwmon_attr {
+	struct device_attribute dev_attr;
+	struct e1000_hw *hw;
+	struct e1000_thermal_diode_data *sensor;
+	char name[12];
+	};
+
+struct hwmon_buff {
+	struct device *device;
+	struct hwmon_attr *hwmon_list;
+	unsigned int n_hwmon;
+	};
+#endif
+
 /* board specific private data structure */
 struct igb_adapter {
 	unsigned long active_vlans[BITS_TO_LONGS(VLAN_N_VID)];
@@ -398,6 +419,10 @@ struct igb_adapter {
 	struct timecounter tc;
 
 	char fw_version[32];
+#ifdef CONFIG_IGB_HWMON
+	struct hwmon_buff igb_hwmon_buff;
+	bool ets;
+#endif
 	struct i2c_algo_bit_data i2c_algo;
 	struct i2c_adapter i2c_adap;
 	struct igb_i2c_client_list *i2c_clients;
@@ -476,6 +501,10 @@ static inline void igb_ptp_rx_hwtstamp(struct igb_q_vector *q_vector,
 
 extern int igb_ptp_hwtstamp_ioctl(struct net_device *netdev,
 				  struct ifreq *ifr, int cmd);
+#ifdef CONFIG_IGB_HWMON
+extern void igb_sysfs_exit(struct igb_adapter *adapter);
+extern int igb_sysfs_init(struct igb_adapter *adapter);
+#endif
 static inline s32 igb_reset_phy(struct e1000_hw *hw)
 {
 	if (hw->phy.ops.reset)