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

   1 /*
   2  *  Copyright (C) 2017 Chelsio Communications.  All rights reserved.
   3  *
   4  *  This program is free software; you can redistribute it and/or modify it
   5  *  under the terms and conditions of the GNU General Public License,
   6  *  version 2, as published by the Free Software Foundation.
   7  *
   8  *  This program is distributed in the hope it will be useful, but WITHOUT
   9  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  *  more details.
  12  *
  13  *  The full GNU General Public License is included in this distribution in
  14  *  the file called "COPYING".
  15  *
  16  *  Written by: Ganesh Goudar (ganeshgr@chelsio.com)
  17  */
  18
  19 #include "cxgb4.h"
  20
  21 #define CXGB4_NUM_TRIPS 1
  22
  23 static int cxgb4_thermal_get_temp(struct thermal_zone_device *tzdev,
  24                                   int *temp)
  25 {
  26         struct adapter *adap = tzdev->devdata;
  27         u32 param, val;
  28         int ret;
  29
  30         param = (FW_PARAMS_MNEM_V(FW_PARAMS_MNEM_DEV) |
  31                  FW_PARAMS_PARAM_X_V(FW_PARAMS_PARAM_DEV_DIAG) |
  32                  FW_PARAMS_PARAM_Y_V(FW_PARAM_DEV_DIAG_TMP));
  33
  34         ret = t4_query_params(adap, adap->mbox, adap->pf, 0, 1,
  35                               &param, &val);
  36         if (ret < 0 || val == 0)
  37                 return -1;
  38
  39         *temp = val * 1000;
  40         return 0;
  41 }
  42
  43 static int cxgb4_thermal_get_trip_type(struct thermal_zone_device *tzdev,
  44                                        int trip, enum thermal_trip_type *type)
  45 {
  46         struct adapter *adap = tzdev->devdata;
  47
  48         if (!adap->ch_thermal.trip_temp)
  49                 return -EINVAL;
  50
  51         *type = adap->ch_thermal.trip_type;
  52         return 0;
  53 }
  54
  55 static int cxgb4_thermal_get_trip_temp(struct thermal_zone_device *tzdev,
  56                                        int trip, int *temp)
  57 {
  58         struct adapter *adap = tzdev->devdata;
  59
  60         if (!adap->ch_thermal.trip_temp)
  61                 return -EINVAL;
  62
  63         *temp = adap->ch_thermal.trip_temp;
  64         return 0;
  65 }
  66
  67 static struct thermal_zone_device_ops cxgb4_thermal_ops = {
  68         .get_temp = cxgb4_thermal_get_temp,
  69         .get_trip_type = cxgb4_thermal_get_trip_type,
  70         .get_trip_temp = cxgb4_thermal_get_trip_temp,
  71 };
  72
  73 int cxgb4_thermal_init(struct adapter *adap)
  74 {
  75         struct ch_thermal *ch_thermal = &adap->ch_thermal;
  76         int num_trip = CXGB4_NUM_TRIPS;
  77         u32 param, val;
  78         int ret;
  79
  80         /* on older firmwares we may not get the trip temperature,
  81          * set the num of trips to 0.
  82          */
  83         param = (FW_PARAMS_MNEM_V(FW_PARAMS_MNEM_DEV) |
  84                  FW_PARAMS_PARAM_X_V(FW_PARAMS_PARAM_DEV_DIAG) |
  85                  FW_PARAMS_PARAM_Y_V(FW_PARAM_DEV_DIAG_MAXTMPTHRESH));
  86
  87         ret = t4_query_params(adap, adap->mbox, adap->pf, 0, 1,
  88                               &param, &val);
  89         if (ret < 0) {
  90                 num_trip = 0; /* could not get trip temperature */
  91         } else {
  92                 ch_thermal->trip_temp = val * 1000;
  93                 ch_thermal->trip_type = THERMAL_TRIP_CRITICAL;
  94         }
  95
  96         ch_thermal->tzdev = thermal_zone_device_register("cxgb4", num_trip,
  97                                                          0, adap,
  98                                                          &cxgb4_thermal_ops,
  99                                                          NULL, 0, 0);
 100         if (IS_ERR(ch_thermal->tzdev)) {
 101                 ret = PTR_ERR(ch_thermal->tzdev);
 102                 dev_err(adap->pdev_dev, "Failed to register thermal zone\n");
 103                 ch_thermal->tzdev = NULL;
 104                 return ret;
 105         }
 106         return 0;
 107 }
 108
 109 int cxgb4_thermal_remove(struct adapter *adap)
 110 {
 111         if (adap->ch_thermal.tzdev)
 112                 thermal_zone_device_unregister(adap->ch_thermal.tzdev);
 113         return 0;
 114 }