cxgb4: Add thermal zone support

Add thermal zone support to monitor ASIC's temperature.

Signed-off-by: Ganesh Goudar <ganeshgr@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 114 insertions, 0 deletions

diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_thermal.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_thermal.c
new file mode 100644
index 000000000000..28052e7504e5
--- /dev/null
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_thermal.c
@@ -0,0 +1,114 @@
+/*
+ *  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 (ganeshgr@chelsio.com)
+ */
+
+#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;
+}