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

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  Copyright (C) 2017 Chelsio Communications.  All rights reserved.
   4  *
   5  *  Written by: Ganesh Goudar (ganeshgr@chelsio.com)
   6  */
   7
   8 #include "cxgb4.h"
   9
  10 #define CXGB4_NUM_TRIPS 1
  11
  12 static int cxgb4_thermal_get_temp(struct thermal_zone_device *tzdev,
  13                                   int *temp)
  14 {
  15         struct adapter *adap = tzdev->devdata;
  16         u32 param, val;
  17         int ret;
  18
  19         param = (FW_PARAMS_MNEM_V(FW_PARAMS_MNEM_DEV) |
  20                  FW_PARAMS_PARAM_X_V(FW_PARAMS_PARAM_DEV_DIAG) |
  21                  FW_PARAMS_PARAM_Y_V(FW_PARAM_DEV_DIAG_TMP));
  22
  23         ret = t4_query_params(adap, adap->mbox, adap->pf, 0, 1,
  24                               &param, &val);
  25         if (ret < 0 || val == 0)
  26                 return -1;
  27
  28         *temp = val * 1000;
  29         return 0;
  30 }
  31
  32 static int cxgb4_thermal_get_trip_type(struct thermal_zone_device *tzdev,
  33                                        int trip, enum thermal_trip_type *type)
  34 {
  35         struct adapter *adap = tzdev->devdata;
  36
  37         if (!adap->ch_thermal.trip_temp)
  38                 return -EINVAL;
  39
  40         *type = adap->ch_thermal.trip_type;
  41         return 0;
  42 }
  43
  44 static int cxgb4_thermal_get_trip_temp(struct thermal_zone_device *tzdev,
  45                                        int trip, int *temp)
  46 {
  47         struct adapter *adap = tzdev->devdata;
  48
  49         if (!adap->ch_thermal.trip_temp)
  50                 return -EINVAL;
  51
  52         *temp = adap->ch_thermal.trip_temp;
  53         return 0;
  54 }
  55
  56 static struct thermal_zone_device_ops cxgb4_thermal_ops = {
  57         .get_temp = cxgb4_thermal_get_temp,
  58         .get_trip_type = cxgb4_thermal_get_trip_type,
  59         .get_trip_temp = cxgb4_thermal_get_trip_temp,
  60 };
  61
  62 int cxgb4_thermal_init(struct adapter *adap)
  63 {
  64         struct ch_thermal *ch_thermal = &adap->ch_thermal;
  65         char ch_tz_name[THERMAL_NAME_LENGTH];
  66         int num_trip = CXGB4_NUM_TRIPS;
  67         u32 param, val;
  68         int ret;
  69
  70         /* on older firmwares we may not get the trip temperature,
  71          * set the num of trips to 0.
  72          */
  73         param = (FW_PARAMS_MNEM_V(FW_PARAMS_MNEM_DEV) |
  74                  FW_PARAMS_PARAM_X_V(FW_PARAMS_PARAM_DEV_DIAG) |
  75                  FW_PARAMS_PARAM_Y_V(FW_PARAM_DEV_DIAG_MAXTMPTHRESH));
  76
  77         ret = t4_query_params(adap, adap->mbox, adap->pf, 0, 1,
  78                               &param, &val);
  79         if (ret < 0) {
  80                 num_trip = 0; /* could not get trip temperature */
  81         } else {
  82                 ch_thermal->trip_temp = val * 1000;
  83                 ch_thermal->trip_type = THERMAL_TRIP_CRITICAL;
  84         }
  85
  86         snprintf(ch_tz_name, sizeof(ch_tz_name), "cxgb4_%s", adap->name);
  87         ch_thermal->tzdev = thermal_zone_device_register(ch_tz_name, num_trip,
  88                                                          0, adap,
  89                                                          &cxgb4_thermal_ops,
  90                                                          NULL, 0, 0);
  91         if (IS_ERR(ch_thermal->tzdev)) {
  92                 ret = PTR_ERR(ch_thermal->tzdev);
  93                 dev_err(adap->pdev_dev, "Failed to register thermal zone\n");
  94                 ch_thermal->tzdev = NULL;
  95                 return ret;
  96         }
  97
  98         ret = thermal_zone_device_enable(ch_thermal->tzdev);
  99         if (ret) {
 100                 dev_err(adap->pdev_dev, "Failed to enable thermal zone\n");
 101                 thermal_zone_device_unregister(adap->ch_thermal.tzdev);
 102                 return ret;
 103         }
 104
 105         return 0;
 106 }
 107
 108 int cxgb4_thermal_remove(struct adapter *adap)
 109 {
 110         if (adap->ch_thermal.tzdev) {
 111                 thermal_zone_device_unregister(adap->ch_thermal.tzdev);
 112                 adap->ch_thermal.tzdev = NULL;
 113         }
 114         return 0;
 115 }