Commit | Line | Data |
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2b27bdcc | 1 | // SPDX-License-Identifier: GPL-2.0-only |
445eaf87 EV |
2 | /* |
3 | * OMAP thermal driver interface | |
4 | * | |
5 | * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/ | |
6 | * Contact: | |
7 | * Eduardo Valentin <eduardo.valentin@ti.com> | |
445eaf87 EV |
8 | */ |
9 | ||
10 | #include <linux/device.h> | |
11 | #include <linux/err.h> | |
12 | #include <linux/mutex.h> | |
13 | #include <linux/gfp.h> | |
14 | #include <linux/kernel.h> | |
15 | #include <linux/workqueue.h> | |
16 | #include <linux/thermal.h> | |
4d753aa7 | 17 | #include <linux/cpufreq.h> |
5035d48d | 18 | #include <linux/cpumask.h> |
445eaf87 | 19 | #include <linux/cpu_cooling.h> |
26d9cc65 | 20 | #include <linux/of.h> |
445eaf87 | 21 | |
7372add4 EV |
22 | #include "ti-thermal.h" |
23 | #include "ti-bandgap.h" | |
3a9abd6c | 24 | #include "../thermal_hwmon.h" |
445eaf87 EV |
25 | |
26 | /* common data structures */ | |
03e859d3 | 27 | struct ti_thermal_data { |
4d753aa7 | 28 | struct cpufreq_policy *policy; |
03e859d3 | 29 | struct thermal_zone_device *ti_thermal; |
359836e1 | 30 | struct thermal_zone_device *pcb_tz; |
445eaf87 | 31 | struct thermal_cooling_device *cool_dev; |
03e859d3 | 32 | struct ti_bandgap *bgp; |
445eaf87 EV |
33 | enum thermal_device_mode mode; |
34 | struct work_struct thermal_wq; | |
35 | int sensor_id; | |
26d9cc65 | 36 | bool our_zone; |
445eaf87 EV |
37 | }; |
38 | ||
03e859d3 | 39 | static void ti_thermal_work(struct work_struct *work) |
445eaf87 | 40 | { |
03e859d3 EV |
41 | struct ti_thermal_data *data = container_of(work, |
42 | struct ti_thermal_data, thermal_wq); | |
445eaf87 | 43 | |
0e70f466 | 44 | thermal_zone_device_update(data->ti_thermal, THERMAL_EVENT_UNSPECIFIED); |
445eaf87 | 45 | |
03e859d3 EV |
46 | dev_dbg(&data->ti_thermal->device, "updated thermal zone %s\n", |
47 | data->ti_thermal->type); | |
445eaf87 EV |
48 | } |
49 | ||
50 | /** | |
03e859d3 | 51 | * ti_thermal_hotspot_temperature - returns sensor extrapolated temperature |
445eaf87 EV |
52 | * @t: omap sensor temperature |
53 | * @s: omap sensor slope value | |
54 | * @c: omap sensor const value | |
55 | */ | |
03e859d3 | 56 | static inline int ti_thermal_hotspot_temperature(int t, int s, int c) |
445eaf87 EV |
57 | { |
58 | int delta = t * s / 1000 + c; | |
59 | ||
60 | if (delta < 0) | |
61 | delta = 0; | |
62 | ||
63 | return t + delta; | |
64 | } | |
65 | ||
66 | /* thermal zone ops */ | |
e34238bf | 67 | /* Get temperature callback function for thermal zone */ |
2cf3c72a | 68 | static inline int __ti_thermal_get_temp(struct thermal_zone_device *tz, int *temp) |
445eaf87 | 69 | { |
359836e1 | 70 | struct thermal_zone_device *pcb_tz = NULL; |
5f68d078 | 71 | struct ti_thermal_data *data = thermal_zone_device_priv(tz); |
03e859d3 | 72 | struct ti_bandgap *bgp; |
9879b2c4 | 73 | const struct ti_temp_sensor *s; |
359836e1 | 74 | int ret, tmp, slope, constant; |
17e8351a | 75 | int pcb_temp; |
445eaf87 | 76 | |
04a4d10d EV |
77 | if (!data) |
78 | return 0; | |
79 | ||
d7f080e6 EV |
80 | bgp = data->bgp; |
81 | s = &bgp->conf->sensors[data->sensor_id]; | |
04a4d10d | 82 | |
03e859d3 | 83 | ret = ti_bandgap_read_temperature(bgp, data->sensor_id, &tmp); |
445eaf87 EV |
84 | if (ret) |
85 | return ret; | |
86 | ||
359836e1 | 87 | /* Default constants */ |
2cf3c72a DL |
88 | slope = thermal_zone_get_slope(tz); |
89 | constant = thermal_zone_get_offset(tz); | |
359836e1 EV |
90 | |
91 | pcb_tz = data->pcb_tz; | |
445eaf87 | 92 | /* In case pcb zone is available, use the extrapolation rule with it */ |
0c12b5ac | 93 | if (!IS_ERR(pcb_tz)) { |
359836e1 EV |
94 | ret = thermal_zone_get_temp(pcb_tz, &pcb_temp); |
95 | if (!ret) { | |
96 | tmp -= pcb_temp; /* got a valid PCB temp */ | |
97 | slope = s->slope_pcb; | |
98 | constant = s->constant_pcb; | |
99 | } else { | |
100 | dev_err(bgp->dev, | |
101 | "Failed to read PCB state. Using defaults\n"); | |
df8f1347 | 102 | ret = 0; |
359836e1 | 103 | } |
445eaf87 | 104 | } |
03e859d3 | 105 | *temp = ti_thermal_hotspot_temperature(tmp, slope, constant); |
445eaf87 EV |
106 | |
107 | return ret; | |
108 | } | |
109 | ||
2cf3c72a | 110 | static int __ti_thermal_get_trend(struct thermal_zone_device *tz, int trip, enum thermal_trend *trend) |
03b7f67b | 111 | { |
5f68d078 | 112 | struct ti_thermal_data *data = thermal_zone_device_priv(tz); |
03b7f67b K |
113 | struct ti_bandgap *bgp; |
114 | int id, tr, ret = 0; | |
115 | ||
116 | bgp = data->bgp; | |
117 | id = data->sensor_id; | |
118 | ||
119 | ret = ti_bandgap_get_trend(bgp, id, &tr); | |
120 | if (ret) | |
121 | return ret; | |
122 | ||
123 | if (tr > 0) | |
124 | *trend = THERMAL_TREND_RAISING; | |
125 | else if (tr < 0) | |
126 | *trend = THERMAL_TREND_DROPPING; | |
127 | else | |
128 | *trend = THERMAL_TREND_STABLE; | |
129 | ||
130 | return 0; | |
131 | } | |
132 | ||
2cf3c72a | 133 | static const struct thermal_zone_device_ops ti_of_thermal_ops = { |
2251aef6 EV |
134 | .get_temp = __ti_thermal_get_temp, |
135 | .get_trend = __ti_thermal_get_trend, | |
136 | }; | |
137 | ||
03e859d3 EV |
138 | static struct ti_thermal_data |
139 | *ti_thermal_build_data(struct ti_bandgap *bgp, int id) | |
445eaf87 | 140 | { |
03e859d3 | 141 | struct ti_thermal_data *data; |
445eaf87 | 142 | |
d7f080e6 | 143 | data = devm_kzalloc(bgp->dev, sizeof(*data), GFP_KERNEL); |
445eaf87 | 144 | if (!data) { |
d7f080e6 | 145 | dev_err(bgp->dev, "kzalloc fail\n"); |
04a4d10d | 146 | return NULL; |
445eaf87 EV |
147 | } |
148 | data->sensor_id = id; | |
d7f080e6 | 149 | data->bgp = bgp; |
445eaf87 | 150 | data->mode = THERMAL_DEVICE_ENABLED; |
0c12b5ac | 151 | /* pcb_tz will be either valid or PTR_ERR() */ |
359836e1 | 152 | data->pcb_tz = thermal_zone_get_zone_by_name("pcb"); |
03e859d3 | 153 | INIT_WORK(&data->thermal_wq, ti_thermal_work); |
445eaf87 | 154 | |
04a4d10d EV |
155 | return data; |
156 | } | |
157 | ||
03e859d3 EV |
158 | int ti_thermal_expose_sensor(struct ti_bandgap *bgp, int id, |
159 | char *domain) | |
04a4d10d | 160 | { |
03e859d3 | 161 | struct ti_thermal_data *data; |
b39d2dd5 | 162 | int interval; |
04a4d10d | 163 | |
03e859d3 | 164 | data = ti_bandgap_get_sensor_data(bgp, id); |
04a4d10d | 165 | |
0f348db0 | 166 | if (IS_ERR_OR_NULL(data)) |
03e859d3 | 167 | data = ti_thermal_build_data(bgp, id); |
04a4d10d EV |
168 | |
169 | if (!data) | |
170 | return -EINVAL; | |
171 | ||
26d9cc65 | 172 | /* in case this is specified by DT */ |
2cf3c72a | 173 | data->ti_thermal = devm_thermal_of_zone_register(bgp->dev, id, |
2251aef6 | 174 | data, &ti_of_thermal_ops); |
26d9cc65 | 175 | if (IS_ERR(data->ti_thermal)) { |
b263b473 K |
176 | dev_err(bgp->dev, "thermal zone device is NULL\n"); |
177 | return PTR_ERR(data->ti_thermal); | |
445eaf87 | 178 | } |
b263b473 | 179 | |
b39d2dd5 DL |
180 | interval = jiffies_to_msecs(data->ti_thermal->polling_delay_jiffies); |
181 | ||
03e859d3 | 182 | ti_bandgap_set_sensor_data(bgp, id, data); |
b39d2dd5 | 183 | ti_bandgap_write_update_interval(bgp, data->sensor_id, interval); |
445eaf87 | 184 | |
3a9abd6c RN |
185 | if (devm_thermal_add_hwmon_sysfs(data->ti_thermal)) |
186 | dev_warn(bgp->dev, "failed to add hwmon sysfs attributes\n"); | |
187 | ||
445eaf87 EV |
188 | return 0; |
189 | } | |
190 | ||
03e859d3 | 191 | int ti_thermal_remove_sensor(struct ti_bandgap *bgp, int id) |
445eaf87 | 192 | { |
03e859d3 | 193 | struct ti_thermal_data *data; |
445eaf87 | 194 | |
03e859d3 | 195 | data = ti_bandgap_get_sensor_data(bgp, id); |
445eaf87 | 196 | |
7440f518 | 197 | if (!IS_ERR_OR_NULL(data) && data->ti_thermal) { |
26d9cc65 EV |
198 | if (data->our_zone) |
199 | thermal_zone_device_unregister(data->ti_thermal); | |
26d9cc65 | 200 | } |
445eaf87 EV |
201 | |
202 | return 0; | |
203 | } | |
204 | ||
03e859d3 | 205 | int ti_thermal_report_sensor_temperature(struct ti_bandgap *bgp, int id) |
445eaf87 | 206 | { |
03e859d3 | 207 | struct ti_thermal_data *data; |
445eaf87 | 208 | |
03e859d3 | 209 | data = ti_bandgap_get_sensor_data(bgp, id); |
445eaf87 EV |
210 | |
211 | schedule_work(&data->thermal_wq); | |
212 | ||
213 | return 0; | |
214 | } | |
215 | ||
03e859d3 | 216 | int ti_thermal_register_cpu_cooling(struct ti_bandgap *bgp, int id) |
445eaf87 | 217 | { |
03e859d3 | 218 | struct ti_thermal_data *data; |
26d9cc65 EV |
219 | struct device_node *np = bgp->dev->of_node; |
220 | ||
221 | /* | |
222 | * We are assuming here that if one deploys the zone | |
223 | * using DT, then it must be aware that the cooling device | |
224 | * loading has to happen via cpufreq driver. | |
225 | */ | |
226 | if (of_find_property(np, "#thermal-sensor-cells", NULL)) | |
227 | return 0; | |
445eaf87 | 228 | |
03e859d3 | 229 | data = ti_bandgap_get_sensor_data(bgp, id); |
0c12b5ac | 230 | if (!data || IS_ERR(data)) |
03e859d3 | 231 | data = ti_thermal_build_data(bgp, id); |
04a4d10d EV |
232 | |
233 | if (!data) | |
234 | return -EINVAL; | |
445eaf87 | 235 | |
4d753aa7 VK |
236 | data->policy = cpufreq_cpu_get(0); |
237 | if (!data->policy) { | |
238 | pr_debug("%s: CPUFreq policy not found\n", __func__); | |
239 | return -EPROBE_DEFER; | |
240 | } | |
241 | ||
445eaf87 | 242 | /* Register cooling device */ |
4d753aa7 | 243 | data->cool_dev = cpufreq_cooling_register(data->policy); |
0c12b5ac | 244 | if (IS_ERR(data->cool_dev)) { |
cffafc32 | 245 | int ret = PTR_ERR(data->cool_dev); |
4d753aa7 VK |
246 | dev_err(bgp->dev, "Failed to register cpu cooling device %d\n", |
247 | ret); | |
248 | cpufreq_cpu_put(data->policy); | |
cffafc32 EV |
249 | |
250 | return ret; | |
445eaf87 | 251 | } |
03e859d3 | 252 | ti_bandgap_set_sensor_data(bgp, id, data); |
445eaf87 EV |
253 | |
254 | return 0; | |
255 | } | |
256 | ||
03e859d3 | 257 | int ti_thermal_unregister_cpu_cooling(struct ti_bandgap *bgp, int id) |
445eaf87 | 258 | { |
03e859d3 | 259 | struct ti_thermal_data *data; |
445eaf87 | 260 | |
03e859d3 | 261 | data = ti_bandgap_get_sensor_data(bgp, id); |
26d9cc65 | 262 | |
7440f518 | 263 | if (!IS_ERR_OR_NULL(data)) { |
26d9cc65 | 264 | cpufreq_cooling_unregister(data->cool_dev); |
ba817a8c TL |
265 | if (data->policy) |
266 | cpufreq_cpu_put(data->policy); | |
4d753aa7 | 267 | } |
445eaf87 EV |
268 | |
269 | return 0; | |
270 | } |