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(void *data, int *out_temp)
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;
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);
56 *out_temp = reply.get_temp.temp;
61 static int tegra_bpmp_thermal_set_trips(void *data, int low, int high)
63 struct tegra_bpmp_thermal_zone *zone = data;
64 struct mrq_thermal_host_to_bpmp_request req;
65 struct tegra_bpmp_message msg;
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;
74 memset(&msg, 0, sizeof(msg));
75 msg.mrq = MRQ_THERMAL;
77 msg.tx.size = sizeof(req);
79 return tegra_bpmp_transfer(zone->tegra->bpmp, &msg);
82 static void tz_device_update_work_fn(struct work_struct *work)
84 struct tegra_bpmp_thermal_zone *zone;
86 zone = container_of(work, struct tegra_bpmp_thermal_zone,
87 tz_device_update_work);
89 thermal_zone_device_update(zone->tzd, THERMAL_TRIP_VIOLATED);
92 static void bpmp_mrq_thermal(unsigned int mrq, struct tegra_bpmp_channel *ch,
95 struct mrq_thermal_bpmp_to_host_request *req;
96 struct tegra_bpmp_thermal *tegra = data;
99 req = (struct mrq_thermal_bpmp_to_host_request *)ch->ib->data;
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);
108 for (i = 0; i < tegra->num_zones; ++i) {
109 if (tegra->zones[i]->idx != req->host_trip_reached.zone)
112 schedule_work(&tegra->zones[i]->tz_device_update_work);
113 tegra_bpmp_mrq_return(ch, 0, NULL, 0);
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);
122 static int tegra_bpmp_thermal_get_num_zones(struct tegra_bpmp *bpmp,
125 struct mrq_thermal_host_to_bpmp_request req;
126 union mrq_thermal_bpmp_to_host_response reply;
127 struct tegra_bpmp_message msg;
130 memset(&req, 0, sizeof(req));
131 req.type = CMD_THERMAL_GET_NUM_ZONES;
133 memset(&msg, 0, sizeof(msg));
134 msg.mrq = MRQ_THERMAL;
136 msg.tx.size = sizeof(req);
137 msg.rx.data = &reply;
138 msg.rx.size = sizeof(reply);
140 err = tegra_bpmp_transfer(bpmp, &msg);
144 *num_zones = reply.get_num_zones.num;
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,
154 static int tegra_bpmp_thermal_probe(struct platform_device *pdev)
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;
162 tegra = devm_kzalloc(&pdev->dev, sizeof(*tegra), GFP_KERNEL);
166 tegra->dev = &pdev->dev;
169 err = tegra_bpmp_thermal_get_num_zones(bpmp, &max_num_zones);
171 dev_err(&pdev->dev, "failed to get the number of zones: %d\n",
176 tegra->zones = devm_kcalloc(&pdev->dev, max_num_zones,
177 sizeof(*tegra->zones), GFP_KERNEL);
181 for (i = 0; i < max_num_zones; ++i) {
182 struct tegra_bpmp_thermal_zone *zone;
185 zone = devm_kzalloc(&pdev->dev, sizeof(*zone), GFP_KERNEL);
192 err = tegra_bpmp_thermal_get_temp(zone, &temp);
194 devm_kfree(&pdev->dev, zone);
198 tzd = devm_thermal_zone_of_sensor_register(
199 &pdev->dev, i, zone, &tegra_bpmp_of_thermal_ops);
201 if (PTR_ERR(tzd) == -EPROBE_DEFER)
202 return -EPROBE_DEFER;
203 devm_kfree(&pdev->dev, zone);
208 INIT_WORK(&zone->tz_device_update_work,
209 tz_device_update_work_fn);
211 tegra->zones[tegra->num_zones++] = zone;
214 err = tegra_bpmp_request_mrq(bpmp, MRQ_THERMAL, bpmp_mrq_thermal,
217 dev_err(&pdev->dev, "failed to register mrq handler: %d\n",
222 platform_set_drvdata(pdev, tegra);
227 static int tegra_bpmp_thermal_remove(struct platform_device *pdev)
229 struct tegra_bpmp_thermal *tegra = platform_get_drvdata(pdev);
231 tegra_bpmp_free_mrq(tegra->bpmp, MRQ_THERMAL, tegra);
236 static const struct of_device_id tegra_bpmp_thermal_of_match[] = {
237 { .compatible = "nvidia,tegra186-bpmp-thermal" },
240 MODULE_DEVICE_TABLE(of, tegra_bpmp_thermal_of_match);
242 static struct platform_driver tegra_bpmp_thermal_driver = {
243 .probe = tegra_bpmp_thermal_probe,
244 .remove = tegra_bpmp_thermal_remove,
246 .name = "tegra-bpmp-thermal",
247 .of_match_table = tegra_bpmp_thermal_of_match,
250 module_platform_driver(tegra_bpmp_thermal_driver);
252 MODULE_AUTHOR("Mikko Perttunen <mperttunen@nvidia.com>");
253 MODULE_DESCRIPTION("NVIDIA Tegra BPMP thermal sensor driver");
254 MODULE_LICENSE("GPL v2");