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 
cxgb4_thermal_get_temp(struct thermal_zone_device * tzdev,int * temp)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 
cxgb4_thermal_init(struct adapter * adap)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 
cxgb4_thermal_remove(struct adapter * adap)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 }
91