cxgb4: Add thermal zone support

Add thermal zone support to monitor ASIC's temperature.

Signed-off-by: Ganesh Goudar <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/ethernet/chelsio/cxgb4/Makefile

···
 cxgb4-$(CONFIG_CHELSIO_T4_DCB) +=  cxgb4_dcb.o
 cxgb4-$(CONFIG_CHELSIO_T4_FCOE) +=  cxgb4_fcoe.o
 cxgb4-$(CONFIG_DEBUG_FS) += cxgb4_debugfs.o
+cxgb4-$(CONFIG_THERMAL) += cxgb4_thermal.o

drivers/net/ethernet/chelsio/cxgb4/cxgb4.h

···
 #include <linux/ptp_clock_kernel.h>
 #include <linux/ptp_classify.h>
 #include <linux/crash_dump.h>
+#include <linux/thermal.h>
 #include <asm/io.h>
 #include "t4_chip_type.h"
 #include "cxgb4_uld.h"
···
 	atomic_t refcnt;
 };
 
+#ifdef CONFIG_THERMAL
+struct ch_thermal {
+	struct thermal_zone_device *tzdev;
+	int trip_temp;
+	int trip_type;
+};
+#endif
+
 struct adapter {
 	void __iomem *regs;
 	void __iomem *bar2;
···
 
 	/* Dump buffer for collecting logs in kdump kernel */
 	struct vmcoredd_data vmcoredd;
+#ifdef CONFIG_THERMAL
+	struct ch_thermal ch_thermal;
+#endif
 };
 
 /* Support for "sched-class" command to allow a TX Scheduling Class to be
···
 int t4_set_vlan_acl(struct adapter *adap, unsigned int mbox, unsigned int vf,
 		    u16 vlan);
 int cxgb4_dcb_enabled(const struct net_device *dev);
+
+#ifdef CONFIG_THERMAL
+int cxgb4_thermal_init(struct adapter *adap);
+int cxgb4_thermal_remove(struct adapter *adap);
+#endif /* CONFIG_THERMAL */
+
 #endif /* __CXGB4_H__ */

drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c

···
 	if (!is_t4(adapter->params.chip))
 		cxgb4_ptp_init(adapter);
 
+#ifdef CONFIG_THERMAL
+	if (!is_t4(adapter->params.chip) && (adapter->flags & FW_OK))
+		cxgb4_thermal_init(adapter);
+#endif /* CONFIG_THERMAL */
+
 	print_adapter_info(adapter);
 	return 0;
 
···
 
 		if (!is_t4(adapter->params.chip))
 			cxgb4_ptp_stop(adapter);
+#ifdef CONFIG_THERMAL
+		cxgb4_thermal_remove(adapter);
+#endif
 
 		/* If we allocated filters, free up state associated with any
 		 * valid filters ...

drivers/net/ethernet/chelsio/cxgb4/cxgb4_thermal.c

···
+/*
+ *  Copyright (C) 2017 Chelsio Communications.  All rights reserved.
+ *
+ *  This program is free software; you can redistribute it and/or modify it
+ *  under the terms and conditions of the GNU General Public License,
+ *  version 2, as published by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope 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.
+ *
+ *  The full GNU General Public License is included in this distribution in
+ *  the file called "COPYING".
+ *
+ *  Written by: Ganesh Goudar ([e-mail])
+ */
+
+#include "cxgb4.h"
+
+#define CXGB4_NUM_TRIPS 1
+
+static int cxgb4_thermal_get_temp(struct thermal_zone_device *tzdev,
+				  int *temp)
+{
+	struct adapter *adap = tzdev->devdata;
+	u32 param, val;
+	int ret;
+
+	param = (FW_PARAMS_MNEM_V(FW_PARAMS_MNEM_DEV) |
+		 FW_PARAMS_PARAM_X_V(FW_PARAMS_PARAM_DEV_DIAG) |
+		 FW_PARAMS_PARAM_Y_V(FW_PARAM_DEV_DIAG_TMP));
+
+	ret = t4_query_params(adap, adap->mbox, adap->pf, 0, 1,
+			      &param, &val);
+	if (ret < 0 || val == 0)
+		return -1;
+
+	*temp = val * 1000;
+	return 0;
+}
+
+static int cxgb4_thermal_get_trip_type(struct thermal_zone_device *tzdev,
+				       int trip, enum thermal_trip_type *type)
+{
+	struct adapter *adap = tzdev->devdata;
+
+	if (!adap->ch_thermal.trip_temp)
+		return -EINVAL;
+
+	*type = adap->ch_thermal.trip_type;
+	return 0;
+}
+
+static int cxgb4_thermal_get_trip_temp(struct thermal_zone_device *tzdev,
+				       int trip, int *temp)
+{
+	struct adapter *adap = tzdev->devdata;
+
+	if (!adap->ch_thermal.trip_temp)
+		return -EINVAL;
+
+	*temp = adap->ch_thermal.trip_temp;
+	return 0;
+}
+
+static struct thermal_zone_device_ops cxgb4_thermal_ops = {
+	.get_temp = cxgb4_thermal_get_temp,
+	.get_trip_type = cxgb4_thermal_get_trip_type,
+	.get_trip_temp = cxgb4_thermal_get_trip_temp,
+};
+
+int cxgb4_thermal_init(struct adapter *adap)
+{
+	struct ch_thermal *ch_thermal = &adap->ch_thermal;
+	int num_trip = CXGB4_NUM_TRIPS;
+	u32 param, val;
+	int ret;
+
+	/* on older firmwares we may not get the trip temperature,
+	 * set the num of trips to 0.
+	 */
+	param = (FW_PARAMS_MNEM_V(FW_PARAMS_MNEM_DEV) |
+		 FW_PARAMS_PARAM_X_V(FW_PARAMS_PARAM_DEV_DIAG) |
+		 FW_PARAMS_PARAM_Y_V(FW_PARAM_DEV_DIAG_MAXTMPTHRESH));
+
+	ret = t4_query_params(adap, adap->mbox, adap->pf, 0, 1,
+			      &param, &val);
+	if (ret < 0) {
+		num_trip = 0; /* could not get trip temperature */
+	} else {
+		ch_thermal->trip_temp = val * 1000;
+		ch_thermal->trip_type = THERMAL_TRIP_CRITICAL;
+	}
+
+	ch_thermal->tzdev = thermal_zone_device_register("cxgb4", num_trip,
+							 0, adap,
+							 &cxgb4_thermal_ops,
+							 NULL, 0, 0);
+	if (IS_ERR(ch_thermal->tzdev)) {
+		ret = PTR_ERR(ch_thermal->tzdev);
+		dev_err(adap->pdev_dev, "Failed to register thermal zone\n");
+		ch_thermal->tzdev = NULL;
+		return ret;
+	}
+	return 0;
+}
+
+int cxgb4_thermal_remove(struct adapter *adap)
+{
+	if (adap->ch_thermal.tzdev)
+		thermal_zone_device_unregister(adap->ch_thermal.tzdev);
+	return 0;
+}

drivers/net/ethernet/chelsio/cxgb4/t4fw_api.h

···
 enum fw_params_param_dev_diag {
 	FW_PARAM_DEV_DIAG_TMP		= 0x00,
 	FW_PARAM_DEV_DIAG_VDD		= 0x01,
+	FW_PARAM_DEV_DIAG_MAXTMPTHRESH	= 0x02,
 };
 
 enum fw_params_param_dev_fwcache {