tjh.dev
Linux kernel mirror (for testing)
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linux
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
19struct 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
26struct 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
33static int __tegra_bpmp_thermal_get_temp(struct tegra_bpmp_thermal_zone *zone,
34 int *out_temp)
35{
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 if (msg.rx.ret)
56 return -EINVAL;
57
58 *out_temp = reply.get_temp.temp;
59
60 return 0;
61}
62
63static int tegra_bpmp_thermal_get_temp(struct thermal_zone_device *tz, int *out_temp)
64{
65 return __tegra_bpmp_thermal_get_temp(tz->devdata, out_temp);
66}
67
68static int tegra_bpmp_thermal_set_trips(struct thermal_zone_device *tz, int low, int high)
69{
70 struct tegra_bpmp_thermal_zone *zone = tz->devdata;
71 struct mrq_thermal_host_to_bpmp_request req;
72 struct tegra_bpmp_message msg;
73 int err;
74
75 memset(&req, 0, sizeof(req));
76 req.type = CMD_THERMAL_SET_TRIP;
77 req.set_trip.zone = zone->idx;
78 req.set_trip.enabled = true;
79 req.set_trip.low = low;
80 req.set_trip.high = high;
81
82 memset(&msg, 0, sizeof(msg));
83 msg.mrq = MRQ_THERMAL;
84 msg.tx.data = &req;
85 msg.tx.size = sizeof(req);
86
87 err = tegra_bpmp_transfer(zone->tegra->bpmp, &msg);
88 if (err)
89 return err;
90 if (msg.rx.ret)
91 return -EINVAL;
92
93 return 0;
94}
95
96static void tz_device_update_work_fn(struct work_struct *work)
97{
98 struct tegra_bpmp_thermal_zone *zone;
99
100 zone = container_of(work, struct tegra_bpmp_thermal_zone,
101 tz_device_update_work);
102
103 thermal_zone_device_update(zone->tzd, THERMAL_TRIP_VIOLATED);
104}
105
106static void bpmp_mrq_thermal(unsigned int mrq, struct tegra_bpmp_channel *ch,
107 void *data)
108{
109 struct mrq_thermal_bpmp_to_host_request req;
110 struct tegra_bpmp_thermal *tegra = data;
111 size_t offset;
112 int i;
113
114 offset = offsetof(struct tegra_bpmp_mb_data, data);
115 iosys_map_memcpy_from(&req, &ch->ib, offset, sizeof(req));
116
117 if (req.type != CMD_THERMAL_HOST_TRIP_REACHED) {
118 dev_err(tegra->dev, "%s: invalid request type: %d\n", __func__, req.type);
119 tegra_bpmp_mrq_return(ch, -EINVAL, NULL, 0);
120 return;
121 }
122
123 for (i = 0; i < tegra->num_zones; ++i) {
124 if (tegra->zones[i]->idx != req.host_trip_reached.zone)
125 continue;
126
127 schedule_work(&tegra->zones[i]->tz_device_update_work);
128 tegra_bpmp_mrq_return(ch, 0, NULL, 0);
129 return;
130 }
131
132 dev_err(tegra->dev, "%s: invalid thermal zone: %d\n", __func__,
133 req.host_trip_reached.zone);
134 tegra_bpmp_mrq_return(ch, -EINVAL, NULL, 0);
135}
136
137static int tegra_bpmp_thermal_get_num_zones(struct tegra_bpmp *bpmp,
138 int *num_zones)
139{
140 struct mrq_thermal_host_to_bpmp_request req;
141 union mrq_thermal_bpmp_to_host_response reply;
142 struct tegra_bpmp_message msg;
143 int err;
144
145 memset(&req, 0, sizeof(req));
146 req.type = CMD_THERMAL_GET_NUM_ZONES;
147
148 memset(&msg, 0, sizeof(msg));
149 msg.mrq = MRQ_THERMAL;
150 msg.tx.data = &req;
151 msg.tx.size = sizeof(req);
152 msg.rx.data = &reply;
153 msg.rx.size = sizeof(reply);
154
155 err = tegra_bpmp_transfer(bpmp, &msg);
156 if (err)
157 return err;
158 if (msg.rx.ret)
159 return -EINVAL;
160
161 *num_zones = reply.get_num_zones.num;
162
163 return 0;
164}
165
166static const struct thermal_zone_device_ops tegra_bpmp_of_thermal_ops = {
167 .get_temp = tegra_bpmp_thermal_get_temp,
168 .set_trips = tegra_bpmp_thermal_set_trips,
169};
170
171static int tegra_bpmp_thermal_probe(struct platform_device *pdev)
172{
173 struct tegra_bpmp *bpmp = dev_get_drvdata(pdev->dev.parent);
174 struct tegra_bpmp_thermal *tegra;
175 struct thermal_zone_device *tzd;
176 unsigned int i, max_num_zones;
177 int err;
178
179 tegra = devm_kzalloc(&pdev->dev, sizeof(*tegra), GFP_KERNEL);
180 if (!tegra)
181 return -ENOMEM;
182
183 tegra->dev = &pdev->dev;
184 tegra->bpmp = bpmp;
185
186 err = tegra_bpmp_thermal_get_num_zones(bpmp, &max_num_zones);
187 if (err) {
188 dev_err(&pdev->dev, "failed to get the number of zones: %d\n",
189 err);
190 return err;
191 }
192
193 tegra->zones = devm_kcalloc(&pdev->dev, max_num_zones,
194 sizeof(*tegra->zones), GFP_KERNEL);
195 if (!tegra->zones)
196 return -ENOMEM;
197
198 for (i = 0; i < max_num_zones; ++i) {
199 struct tegra_bpmp_thermal_zone *zone;
200 int temp;
201
202 zone = devm_kzalloc(&pdev->dev, sizeof(*zone), GFP_KERNEL);
203 if (!zone)
204 return -ENOMEM;
205
206 zone->idx = i;
207 zone->tegra = tegra;
208
209 err = __tegra_bpmp_thermal_get_temp(zone, &temp);
210 if (err < 0) {
211 devm_kfree(&pdev->dev, zone);
212 continue;
213 }
214
215 tzd = devm_thermal_of_zone_register(
216 &pdev->dev, i, zone, &tegra_bpmp_of_thermal_ops);
217 if (IS_ERR(tzd)) {
218 if (PTR_ERR(tzd) == -EPROBE_DEFER)
219 return -EPROBE_DEFER;
220 devm_kfree(&pdev->dev, zone);
221 continue;
222 }
223
224 zone->tzd = tzd;
225 INIT_WORK(&zone->tz_device_update_work,
226 tz_device_update_work_fn);
227
228 tegra->zones[tegra->num_zones++] = zone;
229 }
230
231 err = tegra_bpmp_request_mrq(bpmp, MRQ_THERMAL, bpmp_mrq_thermal,
232 tegra);
233 if (err) {
234 dev_err(&pdev->dev, "failed to register mrq handler: %d\n",
235 err);
236 return err;
237 }
238
239 platform_set_drvdata(pdev, tegra);
240
241 return 0;
242}
243
244static int tegra_bpmp_thermal_remove(struct platform_device *pdev)
245{
246 struct tegra_bpmp_thermal *tegra = platform_get_drvdata(pdev);
247
248 tegra_bpmp_free_mrq(tegra->bpmp, MRQ_THERMAL, tegra);
249
250 return 0;
251}
252
253static const struct of_device_id tegra_bpmp_thermal_of_match[] = {
254 { .compatible = "nvidia,tegra186-bpmp-thermal" },
255 { },
256};
257MODULE_DEVICE_TABLE(of, tegra_bpmp_thermal_of_match);
258
259static struct platform_driver tegra_bpmp_thermal_driver = {
260 .probe = tegra_bpmp_thermal_probe,
261 .remove = tegra_bpmp_thermal_remove,
262 .driver = {
263 .name = "tegra-bpmp-thermal",
264 .of_match_table = tegra_bpmp_thermal_of_match,
265 },
266};
267module_platform_driver(tegra_bpmp_thermal_driver);
268
269MODULE_AUTHOR("Mikko Perttunen <mperttunen@nvidia.com>");
270MODULE_DESCRIPTION("NVIDIA Tegra BPMP thermal sensor driver");
271MODULE_LICENSE("GPL v2");