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 = thermal_zone_device_priv(tzdev);
  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 struct thermal_zone_device_ops cxgb4_thermal_ops = {
  33         .get_temp = cxgb4_thermal_get_temp,
  34 };
  35
  36 static struct thermal_trip trip = { .type = THERMAL_TRIP_CRITICAL } ;
  37
  38 int cxgb4_thermal_init(struct adapter *adap)
  39 {
  40         struct ch_thermal *ch_thermal = &adap->ch_thermal;
  41         char ch_tz_name[THERMAL_NAME_LENGTH];
  42         int num_trip = CXGB4_NUM_TRIPS;
  43         u32 param, val;
  44         int ret;
  45
  46         /* on older firmwares we may not get the trip temperature,
  47          * set the num of trips to 0.
  48          */
  49         param = (FW_PARAMS_MNEM_V(FW_PARAMS_MNEM_DEV) |
  50                  FW_PARAMS_PARAM_X_V(FW_PARAMS_PARAM_DEV_DIAG) |
  51                  FW_PARAMS_PARAM_Y_V(FW_PARAM_DEV_DIAG_MAXTMPTHRESH));
  52
  53         ret = t4_query_params(adap, adap->mbox, adap->pf, 0, 1,
  54                               &param, &val);
  55         if (ret < 0) {
  56                 num_trip = 0; /* could not get trip temperature */
  57         } else {
  58                 trip.temperature = val * 1000;
  59         }
  60
  61         snprintf(ch_tz_name, sizeof(ch_tz_name), "cxgb4_%s", adap->name);
  62         ch_thermal->tzdev = thermal_zone_device_register_with_trips(ch_tz_name, &trip, num_trip,
  63                                                                     0, adap,
  64                                                                     &cxgb4_thermal_ops,
  65                                                                     NULL, 0, 0);
  66         if (IS_ERR(ch_thermal->tzdev)) {
  67                 ret = PTR_ERR(ch_thermal->tzdev);
  68                 dev_err(adap->pdev_dev, "Failed to register thermal zone\n");
  69                 ch_thermal->tzdev = NULL;
  70                 return ret;
  71         }
  72
  73         ret = thermal_zone_device_enable(ch_thermal->tzdev);
  74         if (ret) {
  75                 dev_err(adap->pdev_dev, "Failed to enable thermal zone\n");
  76                 thermal_zone_device_unregister(adap->ch_thermal.tzdev);
  77                 return ret;
  78         }
  79
  80         return 0;
  81 }
  82
  83 int cxgb4_thermal_remove(struct adapter *adap)
  84 {
  85         if (adap->ch_thermal.tzdev) {
  86                 thermal_zone_device_unregister(adap->ch_thermal.tzdev);
  87                 adap->ch_thermal.tzdev = NULL;
  88         }
  89         return 0;
  90 }