1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2015-2017, NVIDIA CORPORATION. All rights reserved.
6 * Mikko Perttunen <mperttunen@nvidia.com>
7 * Aapo Vienamo <avienamo@nvidia.com>
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>
16 #include <soc/tegra/bpmp.h>
17 #include <soc/tegra/bpmp-abi.h>
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;
26 struct tegra_bpmp_thermal {
28 struct tegra_bpmp *bpmp;
29 unsigned int num_zones;
30 struct tegra_bpmp_thermal_zone **zones;
33 static int __tegra_bpmp_thermal_get_temp(struct tegra_bpmp_thermal_zone *zone,
36 struct mrq_thermal_host_to_bpmp_request req;
37 union mrq_thermal_bpmp_to_host_response reply;
38 struct tegra_bpmp_message msg;
41 memset(&req, 0, sizeof(req));
42 req.type = CMD_THERMAL_GET_TEMP;
43 req.get_temp.zone = zone->idx;
45 memset(&msg, 0, sizeof(msg));
46 msg.mrq = MRQ_THERMAL;
48 msg.tx.size = sizeof(req);
50 msg.rx.size = sizeof(reply);
52 err = tegra_bpmp_transfer(zone->tegra->bpmp, &msg);
55 if (msg.rx.ret == -BPMP_EFAULT)
60 *out_temp = reply.get_temp.temp;
65 static int tegra_bpmp_thermal_get_temp(struct thermal_zone_device *tz, int *out_temp)
67 struct tegra_bpmp_thermal_zone *zone = thermal_zone_device_priv(tz);
69 return __tegra_bpmp_thermal_get_temp(zone, out_temp);
72 static int tegra_bpmp_thermal_set_trips(struct thermal_zone_device *tz, int low, int high)
74 struct tegra_bpmp_thermal_zone *zone = thermal_zone_device_priv(tz);
75 struct mrq_thermal_host_to_bpmp_request req;
76 struct tegra_bpmp_message msg;
79 memset(&req, 0, sizeof(req));
80 req.type = CMD_THERMAL_SET_TRIP;
81 req.set_trip.zone = zone->idx;
82 req.set_trip.enabled = true;
83 req.set_trip.low = low;
84 req.set_trip.high = high;
86 memset(&msg, 0, sizeof(msg));
87 msg.mrq = MRQ_THERMAL;
89 msg.tx.size = sizeof(req);
91 err = tegra_bpmp_transfer(zone->tegra->bpmp, &msg);
100 static void tz_device_update_work_fn(struct work_struct *work)
102 struct tegra_bpmp_thermal_zone *zone;
104 zone = container_of(work, struct tegra_bpmp_thermal_zone,
105 tz_device_update_work);
107 thermal_zone_device_update(zone->tzd, THERMAL_TRIP_VIOLATED);
110 static void bpmp_mrq_thermal(unsigned int mrq, struct tegra_bpmp_channel *ch,
113 struct mrq_thermal_bpmp_to_host_request req;
114 struct tegra_bpmp_thermal *tegra = data;
118 offset = offsetof(struct tegra_bpmp_mb_data, data);
119 iosys_map_memcpy_from(&req, &ch->ib, offset, sizeof(req));
121 if (req.type != CMD_THERMAL_HOST_TRIP_REACHED) {
122 dev_err(tegra->dev, "%s: invalid request type: %d\n", __func__, req.type);
123 tegra_bpmp_mrq_return(ch, -EINVAL, NULL, 0);
127 for (i = 0; i < tegra->num_zones; ++i) {
128 if (tegra->zones[i]->idx != req.host_trip_reached.zone)
131 schedule_work(&tegra->zones[i]->tz_device_update_work);
132 tegra_bpmp_mrq_return(ch, 0, NULL, 0);
136 dev_err(tegra->dev, "%s: invalid thermal zone: %d\n", __func__,
137 req.host_trip_reached.zone);
138 tegra_bpmp_mrq_return(ch, -EINVAL, NULL, 0);
141 static int tegra_bpmp_thermal_get_num_zones(struct tegra_bpmp *bpmp,
144 struct mrq_thermal_host_to_bpmp_request req;
145 union mrq_thermal_bpmp_to_host_response reply;
146 struct tegra_bpmp_message msg;
149 memset(&req, 0, sizeof(req));
150 req.type = CMD_THERMAL_GET_NUM_ZONES;
152 memset(&msg, 0, sizeof(msg));
153 msg.mrq = MRQ_THERMAL;
155 msg.tx.size = sizeof(req);
156 msg.rx.data = &reply;
157 msg.rx.size = sizeof(reply);
159 err = tegra_bpmp_transfer(bpmp, &msg);
165 *num_zones = reply.get_num_zones.num;
170 static int tegra_bpmp_thermal_trips_supported(struct tegra_bpmp *bpmp, bool *supported)
172 struct mrq_thermal_host_to_bpmp_request req;
173 union mrq_thermal_bpmp_to_host_response reply;
174 struct tegra_bpmp_message msg;
177 memset(&req, 0, sizeof(req));
178 req.type = CMD_THERMAL_QUERY_ABI;
179 req.query_abi.type = CMD_THERMAL_SET_TRIP;
181 memset(&msg, 0, sizeof(msg));
182 msg.mrq = MRQ_THERMAL;
184 msg.tx.size = sizeof(req);
185 msg.rx.data = &reply;
186 msg.rx.size = sizeof(reply);
188 err = tegra_bpmp_transfer(bpmp, &msg);
192 if (msg.rx.ret == 0) {
195 } else if (msg.rx.ret == -BPMP_ENODEV) {
203 static const struct thermal_zone_device_ops tegra_bpmp_of_thermal_ops = {
204 .get_temp = tegra_bpmp_thermal_get_temp,
205 .set_trips = tegra_bpmp_thermal_set_trips,
208 static const struct thermal_zone_device_ops tegra_bpmp_of_thermal_ops_notrips = {
209 .get_temp = tegra_bpmp_thermal_get_temp,
212 static int tegra_bpmp_thermal_probe(struct platform_device *pdev)
214 struct tegra_bpmp *bpmp = dev_get_drvdata(pdev->dev.parent);
215 const struct thermal_zone_device_ops *thermal_ops;
216 struct tegra_bpmp_thermal *tegra;
217 struct thermal_zone_device *tzd;
218 unsigned int i, max_num_zones;
222 err = tegra_bpmp_thermal_trips_supported(bpmp, &supported);
224 dev_err(&pdev->dev, "failed to determine if trip points are supported\n");
229 thermal_ops = &tegra_bpmp_of_thermal_ops;
231 thermal_ops = &tegra_bpmp_of_thermal_ops_notrips;
233 tegra = devm_kzalloc(&pdev->dev, sizeof(*tegra), GFP_KERNEL);
237 tegra->dev = &pdev->dev;
240 err = tegra_bpmp_thermal_get_num_zones(bpmp, &max_num_zones);
242 dev_err(&pdev->dev, "failed to get the number of zones: %d\n",
247 tegra->zones = devm_kcalloc(&pdev->dev, max_num_zones,
248 sizeof(*tegra->zones), GFP_KERNEL);
252 for (i = 0; i < max_num_zones; ++i) {
253 struct tegra_bpmp_thermal_zone *zone;
256 zone = devm_kzalloc(&pdev->dev, sizeof(*zone), GFP_KERNEL);
263 err = __tegra_bpmp_thermal_get_temp(zone, &temp);
266 * Sensors in powergated domains may temporarily fail to be read
267 * (-EAGAIN), but will become accessible when the domain is powered on.
269 if (err < 0 && err != -EAGAIN) {
270 devm_kfree(&pdev->dev, zone);
274 tzd = devm_thermal_of_zone_register(
275 &pdev->dev, i, zone, thermal_ops);
277 if (PTR_ERR(tzd) == -EPROBE_DEFER)
278 return -EPROBE_DEFER;
279 devm_kfree(&pdev->dev, zone);
284 INIT_WORK(&zone->tz_device_update_work,
285 tz_device_update_work_fn);
287 tegra->zones[tegra->num_zones++] = zone;
290 err = tegra_bpmp_request_mrq(bpmp, MRQ_THERMAL, bpmp_mrq_thermal,
293 dev_err(&pdev->dev, "failed to register mrq handler: %d\n",
298 platform_set_drvdata(pdev, tegra);
303 static void tegra_bpmp_thermal_remove(struct platform_device *pdev)
305 struct tegra_bpmp_thermal *tegra = platform_get_drvdata(pdev);
307 tegra_bpmp_free_mrq(tegra->bpmp, MRQ_THERMAL, tegra);
310 static const struct of_device_id tegra_bpmp_thermal_of_match[] = {
311 { .compatible = "nvidia,tegra186-bpmp-thermal" },
314 MODULE_DEVICE_TABLE(of, tegra_bpmp_thermal_of_match);
316 static struct platform_driver tegra_bpmp_thermal_driver = {
317 .probe = tegra_bpmp_thermal_probe,
318 .remove_new = tegra_bpmp_thermal_remove,
320 .name = "tegra-bpmp-thermal",
321 .of_match_table = tegra_bpmp_thermal_of_match,
324 module_platform_driver(tegra_bpmp_thermal_driver);
326 MODULE_AUTHOR("Mikko Perttunen <mperttunen@nvidia.com>");
327 MODULE_DESCRIPTION("NVIDIA Tegra BPMP thermal sensor driver");
328 MODULE_LICENSE("GPL v2");