1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2015-2017, NVIDIA CORPORATION. All rights reserved.
*
* Author:
* Mikko Perttunen <mperttunen@nvidia.com>
* Aapo Vienamo <avienamo@nvidia.com>
*/
#include <linux/err.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/thermal.h>
#include <linux/workqueue.h>
#include <soc/tegra/bpmp.h>
#include <soc/tegra/bpmp-abi.h>
struct tegra_bpmp_thermal_zone {
struct tegra_bpmp_thermal *tegra;
struct thermal_zone_device *tzd;
struct work_struct tz_device_update_work;
unsigned int idx;
};
struct tegra_bpmp_thermal {
struct device *dev;
struct tegra_bpmp *bpmp;
unsigned int num_zones;
struct tegra_bpmp_thermal_zone **zones;
};
static int __tegra_bpmp_thermal_get_temp(struct tegra_bpmp_thermal_zone *zone,
int *out_temp)
{
struct mrq_thermal_host_to_bpmp_request req;
union mrq_thermal_bpmp_to_host_response reply;
struct tegra_bpmp_message msg;
int err;
memset(&req, 0, sizeof(req));
req.type = CMD_THERMAL_GET_TEMP;
req.get_temp.zone = zone->idx;
memset(&msg, 0, sizeof(msg));
msg.mrq = MRQ_THERMAL;
msg.tx.data = &req;
msg.tx.size = sizeof(req);
msg.rx.data = &reply;
msg.rx.size = sizeof(reply);
err = tegra_bpmp_transfer(zone->tegra->bpmp, &msg);
if (err)
return err;
if (msg.rx.ret)
return -EINVAL;
*out_temp = reply.get_temp.temp;
return 0;
}
static int tegra_bpmp_thermal_get_temp(struct thermal_zone_device *tz, int *out_temp)
{
return __tegra_bpmp_thermal_get_temp(tz->devdata, out_temp);
}
static int tegra_bpmp_thermal_set_trips(struct thermal_zone_device *tz, int low, int high)
{
struct tegra_bpmp_thermal_zone *zone = tz->devdata;
struct mrq_thermal_host_to_bpmp_request req;
struct tegra_bpmp_message msg;
int err;
memset(&req, 0, sizeof(req));
req.type = CMD_THERMAL_SET_TRIP;
req.set_trip.zone = zone->idx;
req.set_trip.enabled = true;
req.set_trip.low = low;
req.set_trip.high = high;
memset(&msg, 0, sizeof(msg));
msg.mrq = MRQ_THERMAL;
msg.tx.data = &req;
msg.tx.size = sizeof(req);
err = tegra_bpmp_transfer(zone->tegra->bpmp, &msg);
if (err)
return err;
if (msg.rx.ret)
return -EINVAL;
return 0;
}
static void tz_device_update_work_fn(struct work_struct *work)
{
struct tegra_bpmp_thermal_zone *zone;
zone = container_of(work, struct tegra_bpmp_thermal_zone,
tz_device_update_work);
thermal_zone_device_update(zone->tzd, THERMAL_TRIP_VIOLATED);
}
static void bpmp_mrq_thermal(unsigned int mrq, struct tegra_bpmp_channel *ch,
void *data)
{
struct mrq_thermal_bpmp_to_host_request req;
struct tegra_bpmp_thermal *tegra = data;
size_t offset;
int i;
offset = offsetof(struct tegra_bpmp_mb_data, data);
iosys_map_memcpy_from(&req, &ch->ib, offset, sizeof(req));
if (req.type != CMD_THERMAL_HOST_TRIP_REACHED) {
dev_err(tegra->dev, "%s: invalid request type: %d\n", __func__, req.type);
tegra_bpmp_mrq_return(ch, -EINVAL, NULL, 0);
return;
}
for (i = 0; i < tegra->num_zones; ++i) {
if (tegra->zones[i]->idx != req.host_trip_reached.zone)
continue;
schedule_work(&tegra->zones[i]->tz_device_update_work);
tegra_bpmp_mrq_return(ch, 0, NULL, 0);
return;
}
dev_err(tegra->dev, "%s: invalid thermal zone: %d\n", __func__,
req.host_trip_reached.zone);
tegra_bpmp_mrq_return(ch, -EINVAL, NULL, 0);
}
static int tegra_bpmp_thermal_get_num_zones(struct tegra_bpmp *bpmp,
int *num_zones)
{
struct mrq_thermal_host_to_bpmp_request req;
union mrq_thermal_bpmp_to_host_response reply;
struct tegra_bpmp_message msg;
int err;
memset(&req, 0, sizeof(req));
req.type = CMD_THERMAL_GET_NUM_ZONES;
memset(&msg, 0, sizeof(msg));
msg.mrq = MRQ_THERMAL;
msg.tx.data = &req;
msg.tx.size = sizeof(req);
msg.rx.data = &reply;
msg.rx.size = sizeof(reply);
err = tegra_bpmp_transfer(bpmp, &msg);
if (err)
return err;
if (msg.rx.ret)
return -EINVAL;
*num_zones = reply.get_num_zones.num;
return 0;
}
static const struct thermal_zone_device_ops tegra_bpmp_of_thermal_ops = {
.get_temp = tegra_bpmp_thermal_get_temp,
.set_trips = tegra_bpmp_thermal_set_trips,
};
static int tegra_bpmp_thermal_probe(struct platform_device *pdev)
{
struct tegra_bpmp *bpmp = dev_get_drvdata(pdev->dev.parent);
struct tegra_bpmp_thermal *tegra;
struct thermal_zone_device *tzd;
unsigned int i, max_num_zones;
int err;
tegra = devm_kzalloc(&pdev->dev, sizeof(*tegra), GFP_KERNEL);
if (!tegra)
return -ENOMEM;
tegra->dev = &pdev->dev;
tegra->bpmp = bpmp;
err = tegra_bpmp_thermal_get_num_zones(bpmp, &max_num_zones);
if (err) {
dev_err(&pdev->dev, "failed to get the number of zones: %d\n",
err);
return err;
}
tegra->zones = devm_kcalloc(&pdev->dev, max_num_zones,
sizeof(*tegra->zones), GFP_KERNEL);
if (!tegra->zones)
return -ENOMEM;
for (i = 0; i < max_num_zones; ++i) {
struct tegra_bpmp_thermal_zone *zone;
int temp;
zone = devm_kzalloc(&pdev->dev, sizeof(*zone), GFP_KERNEL);
if (!zone)
return -ENOMEM;
zone->idx = i;
zone->tegra = tegra;
err = __tegra_bpmp_thermal_get_temp(zone, &temp);
if (err < 0) {
devm_kfree(&pdev->dev, zone);
continue;
}
tzd = devm_thermal_of_zone_register(
&pdev->dev, i, zone, &tegra_bpmp_of_thermal_ops);
if (IS_ERR(tzd)) {
if (PTR_ERR(tzd) == -EPROBE_DEFER)
return -EPROBE_DEFER;
devm_kfree(&pdev->dev, zone);
continue;
}
zone->tzd = tzd;
INIT_WORK(&zone->tz_device_update_work,
tz_device_update_work_fn);
tegra->zones[tegra->num_zones++] = zone;
}
err = tegra_bpmp_request_mrq(bpmp, MRQ_THERMAL, bpmp_mrq_thermal,
tegra);
if (err) {
dev_err(&pdev->dev, "failed to register mrq handler: %d\n",
err);
return err;
}
platform_set_drvdata(pdev, tegra);
return 0;
}
static int tegra_bpmp_thermal_remove(struct platform_device *pdev)
{
struct tegra_bpmp_thermal *tegra = platform_get_drvdata(pdev);
tegra_bpmp_free_mrq(tegra->bpmp, MRQ_THERMAL, tegra);
return 0;
}
static const struct of_device_id tegra_bpmp_thermal_of_match[] = {
{ .compatible = "nvidia,tegra186-bpmp-thermal" },
{ },
};
MODULE_DEVICE_TABLE(of, tegra_bpmp_thermal_of_match);
static struct platform_driver tegra_bpmp_thermal_driver = {
.probe = tegra_bpmp_thermal_probe,
.remove = tegra_bpmp_thermal_remove,
.driver = {
.name = "tegra-bpmp-thermal",
.of_match_table = tegra_bpmp_thermal_of_match,
},
};
module_platform_driver(tegra_bpmp_thermal_driver);
MODULE_AUTHOR("Mikko Perttunen <mperttunen@nvidia.com>");
MODULE_DESCRIPTION("NVIDIA Tegra BPMP thermal sensor driver");
MODULE_LICENSE("GPL v2");
|
