1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2015-2017, NVIDIA CORPORATION. All rights reserved.
4 *
5 * Author:
6 * Mikko Perttunen <mperttunen@nvidia.com>
7 * Aapo Vienamo <avienamo@nvidia.com>
8 */
9
10 #include <linux/err.h>
11 #include <linux/module.h>
12 #include <linux/platform_device.h>
13 #include <linux/thermal.h>
14 #include <linux/workqueue.h>
15
16 #include <soc/tegra/bpmp.h>
17 #include <soc/tegra/bpmp-abi.h>
18
19 struct tegra_bpmp_thermal_zone {
20 struct tegra_bpmp_thermal *tegra;
21 struct thermal_zone_device *tzd;
22 struct work_struct tz_device_update_work;
23 unsigned int idx;
24 };
25
26 struct tegra_bpmp_thermal {
27 struct device *dev;
28 struct tegra_bpmp *bpmp;
29 unsigned int num_zones;
30 struct tegra_bpmp_thermal_zone **zones;
31 };
32
tegra_bpmp_thermal_get_temp(void * data,int * out_temp)33 static int tegra_bpmp_thermal_get_temp(void *data, int *out_temp)
34 {
35 struct tegra_bpmp_thermal_zone *zone = data;
36 struct mrq_thermal_host_to_bpmp_request req;
37 union mrq_thermal_bpmp_to_host_response reply;
38 struct tegra_bpmp_message msg;
39 int err;
40
41 memset(&req, 0, sizeof(req));
42 req.type = CMD_THERMAL_GET_TEMP;
43 req.get_temp.zone = zone->idx;
44
45 memset(&msg, 0, sizeof(msg));
46 msg.mrq = MRQ_THERMAL;
47 msg.tx.data = &req;
48 msg.tx.size = sizeof(req);
49 msg.rx.data = &reply;
50 msg.rx.size = sizeof(reply);
51
52 err = tegra_bpmp_transfer(zone->tegra->bpmp, &msg);
53 if (err)
54 return err;
55
56 *out_temp = reply.get_temp.temp;
57
58 return 0;
59 }
60
tegra_bpmp_thermal_set_trips(void * data,int low,int high)61 static int tegra_bpmp_thermal_set_trips(void *data, int low, int high)
62 {
63 struct tegra_bpmp_thermal_zone *zone = data;
64 struct mrq_thermal_host_to_bpmp_request req;
65 struct tegra_bpmp_message msg;
66
67 memset(&req, 0, sizeof(req));
68 req.type = CMD_THERMAL_SET_TRIP;
69 req.set_trip.zone = zone->idx;
70 req.set_trip.enabled = true;
71 req.set_trip.low = low;
72 req.set_trip.high = high;
73
74 memset(&msg, 0, sizeof(msg));
75 msg.mrq = MRQ_THERMAL;
76 msg.tx.data = &req;
77 msg.tx.size = sizeof(req);
78
79 return tegra_bpmp_transfer(zone->tegra->bpmp, &msg);
80 }
81
tz_device_update_work_fn(struct work_struct * work)82 static void tz_device_update_work_fn(struct work_struct *work)
83 {
84 struct tegra_bpmp_thermal_zone *zone;
85
86 zone = container_of(work, struct tegra_bpmp_thermal_zone,
87 tz_device_update_work);
88
89 thermal_zone_device_update(zone->tzd, THERMAL_TRIP_VIOLATED);
90 }
91
bpmp_mrq_thermal(unsigned int mrq,struct tegra_bpmp_channel * ch,void * data)92 static void bpmp_mrq_thermal(unsigned int mrq, struct tegra_bpmp_channel *ch,
93 void *data)
94 {
95 struct mrq_thermal_bpmp_to_host_request *req;
96 struct tegra_bpmp_thermal *tegra = data;
97 int i;
98
99 req = (struct mrq_thermal_bpmp_to_host_request *)ch->ib->data;
100
101 if (req->type != CMD_THERMAL_HOST_TRIP_REACHED) {
102 dev_err(tegra->dev, "%s: invalid request type: %d\n",
103 __func__, req->type);
104 tegra_bpmp_mrq_return(ch, -EINVAL, NULL, 0);
105 return;
106 }
107
108 for (i = 0; i < tegra->num_zones; ++i) {
109 if (tegra->zones[i]->idx != req->host_trip_reached.zone)
110 continue;
111
112 schedule_work(&tegra->zones[i]->tz_device_update_work);
113 tegra_bpmp_mrq_return(ch, 0, NULL, 0);
114 return;
115 }
116
117 dev_err(tegra->dev, "%s: invalid thermal zone: %d\n", __func__,
118 req->host_trip_reached.zone);
119 tegra_bpmp_mrq_return(ch, -EINVAL, NULL, 0);
120 }
121
tegra_bpmp_thermal_get_num_zones(struct tegra_bpmp * bpmp,int * num_zones)122 static int tegra_bpmp_thermal_get_num_zones(struct tegra_bpmp *bpmp,
123 int *num_zones)
124 {
125 struct mrq_thermal_host_to_bpmp_request req;
126 union mrq_thermal_bpmp_to_host_response reply;
127 struct tegra_bpmp_message msg;
128 int err;
129
130 memset(&req, 0, sizeof(req));
131 req.type = CMD_THERMAL_GET_NUM_ZONES;
132
133 memset(&msg, 0, sizeof(msg));
134 msg.mrq = MRQ_THERMAL;
135 msg.tx.data = &req;
136 msg.tx.size = sizeof(req);
137 msg.rx.data = &reply;
138 msg.rx.size = sizeof(reply);
139
140 err = tegra_bpmp_transfer(bpmp, &msg);
141 if (err)
142 return err;
143
144 *num_zones = reply.get_num_zones.num;
145
146 return 0;
147 }
148
149 static const struct thermal_zone_of_device_ops tegra_bpmp_of_thermal_ops = {
150 .get_temp = tegra_bpmp_thermal_get_temp,
151 .set_trips = tegra_bpmp_thermal_set_trips,
152 };
153
tegra_bpmp_thermal_probe(struct platform_device * pdev)154 static int tegra_bpmp_thermal_probe(struct platform_device *pdev)
155 {
156 struct tegra_bpmp *bpmp = dev_get_drvdata(pdev->dev.parent);
157 struct tegra_bpmp_thermal *tegra;
158 struct thermal_zone_device *tzd;
159 unsigned int i, max_num_zones;
160 int err;
161
162 tegra = devm_kzalloc(&pdev->dev, sizeof(*tegra), GFP_KERNEL);
163 if (!tegra)
164 return -ENOMEM;
165
166 tegra->dev = &pdev->dev;
167 tegra->bpmp = bpmp;
168
169 err = tegra_bpmp_thermal_get_num_zones(bpmp, &max_num_zones);
170 if (err) {
171 dev_err(&pdev->dev, "failed to get the number of zones: %d\n",
172 err);
173 return err;
174 }
175
176 tegra->zones = devm_kcalloc(&pdev->dev, max_num_zones,
177 sizeof(*tegra->zones), GFP_KERNEL);
178 if (!tegra->zones)
179 return -ENOMEM;
180
181 for (i = 0; i < max_num_zones; ++i) {
182 struct tegra_bpmp_thermal_zone *zone;
183 int temp;
184
185 zone = devm_kzalloc(&pdev->dev, sizeof(*zone), GFP_KERNEL);
186 if (!zone)
187 return -ENOMEM;
188
189 zone->idx = i;
190 zone->tegra = tegra;
191
192 err = tegra_bpmp_thermal_get_temp(zone, &temp);
193 if (err < 0) {
194 devm_kfree(&pdev->dev, zone);
195 continue;
196 }
197
198 tzd = devm_thermal_zone_of_sensor_register(
199 &pdev->dev, i, zone, &tegra_bpmp_of_thermal_ops);
200 if (IS_ERR(tzd)) {
201 if (PTR_ERR(tzd) == -EPROBE_DEFER)
202 return -EPROBE_DEFER;
203 devm_kfree(&pdev->dev, zone);
204 continue;
205 }
206
207 zone->tzd = tzd;
208 INIT_WORK(&zone->tz_device_update_work,
209 tz_device_update_work_fn);
210
211 tegra->zones[tegra->num_zones++] = zone;
212 }
213
214 err = tegra_bpmp_request_mrq(bpmp, MRQ_THERMAL, bpmp_mrq_thermal,
215 tegra);
216 if (err) {
217 dev_err(&pdev->dev, "failed to register mrq handler: %d\n",
218 err);
219 return err;
220 }
221
222 platform_set_drvdata(pdev, tegra);
223
224 return 0;
225 }
226
tegra_bpmp_thermal_remove(struct platform_device * pdev)227 static int tegra_bpmp_thermal_remove(struct platform_device *pdev)
228 {
229 struct tegra_bpmp_thermal *tegra = platform_get_drvdata(pdev);
230
231 tegra_bpmp_free_mrq(tegra->bpmp, MRQ_THERMAL, tegra);
232
233 return 0;
234 }
235
236 static const struct of_device_id tegra_bpmp_thermal_of_match[] = {
237 { .compatible = "nvidia,tegra186-bpmp-thermal" },
238 { },
239 };
240 MODULE_DEVICE_TABLE(of, tegra_bpmp_thermal_of_match);
241
242 static struct platform_driver tegra_bpmp_thermal_driver = {
243 .probe = tegra_bpmp_thermal_probe,
244 .remove = tegra_bpmp_thermal_remove,
245 .driver = {
246 .name = "tegra-bpmp-thermal",
247 .of_match_table = tegra_bpmp_thermal_of_match,
248 },
249 };
250 module_platform_driver(tegra_bpmp_thermal_driver);
251
252 MODULE_AUTHOR("Mikko Perttunen <mperttunen@nvidia.com>");
253 MODULE_DESCRIPTION("NVIDIA Tegra BPMP thermal sensor driver");
254 MODULE_LICENSE("GPL v2");
255