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 | 25 | |
0c492be4 DL |
26 | #define TI_BANDGAP_UPDATE_INTERVAL_MS 250 |
27 | ||
445eaf87 | 28 | /* common data structures */ |
03e859d3 | 29 | struct ti_thermal_data { |
4d753aa7 | 30 | struct cpufreq_policy *policy; |
03e859d3 | 31 | struct thermal_zone_device *ti_thermal; |
359836e1 | 32 | struct thermal_zone_device *pcb_tz; |
445eaf87 | 33 | struct thermal_cooling_device *cool_dev; |
03e859d3 | 34 | struct ti_bandgap *bgp; |
445eaf87 EV |
35 | enum thermal_device_mode mode; |
36 | struct work_struct thermal_wq; | |
37 | int sensor_id; | |
26d9cc65 | 38 | bool our_zone; |
445eaf87 EV |
39 | }; |
40 | ||
03e859d3 | 41 | static void ti_thermal_work(struct work_struct *work) |
445eaf87 | 42 | { |
03e859d3 EV |
43 | struct ti_thermal_data *data = container_of(work, |
44 | struct ti_thermal_data, thermal_wq); | |
445eaf87 | 45 | |
0e70f466 | 46 | thermal_zone_device_update(data->ti_thermal, THERMAL_EVENT_UNSPECIFIED); |
445eaf87 | 47 | |
dec07d39 | 48 | dev_dbg(data->bgp->dev, "updated thermal zone %s\n", |
dbb0ea15 | 49 | thermal_zone_device_type(data->ti_thermal)); |
445eaf87 EV |
50 | } |
51 | ||
52 | /** | |
03e859d3 | 53 | * ti_thermal_hotspot_temperature - returns sensor extrapolated temperature |
445eaf87 EV |
54 | * @t: omap sensor temperature |
55 | * @s: omap sensor slope value | |
56 | * @c: omap sensor const value | |
57 | */ | |
03e859d3 | 58 | static inline int ti_thermal_hotspot_temperature(int t, int s, int c) |
445eaf87 EV |
59 | { |
60 | int delta = t * s / 1000 + c; | |
61 | ||
62 | if (delta < 0) | |
63 | delta = 0; | |
64 | ||
65 | return t + delta; | |
66 | } | |
67 | ||
68 | /* thermal zone ops */ | |
e34238bf | 69 | /* Get temperature callback function for thermal zone */ |
2cf3c72a | 70 | static inline int __ti_thermal_get_temp(struct thermal_zone_device *tz, int *temp) |
445eaf87 | 71 | { |
359836e1 | 72 | struct thermal_zone_device *pcb_tz = NULL; |
5f68d078 | 73 | struct ti_thermal_data *data = thermal_zone_device_priv(tz); |
03e859d3 | 74 | struct ti_bandgap *bgp; |
9879b2c4 | 75 | const struct ti_temp_sensor *s; |
359836e1 | 76 | int ret, tmp, slope, constant; |
17e8351a | 77 | int pcb_temp; |
445eaf87 | 78 | |
04a4d10d EV |
79 | if (!data) |
80 | return 0; | |
81 | ||
d7f080e6 EV |
82 | bgp = data->bgp; |
83 | s = &bgp->conf->sensors[data->sensor_id]; | |
04a4d10d | 84 | |
03e859d3 | 85 | ret = ti_bandgap_read_temperature(bgp, data->sensor_id, &tmp); |
445eaf87 EV |
86 | if (ret) |
87 | return ret; | |
88 | ||
359836e1 | 89 | /* Default constants */ |
2cf3c72a DL |
90 | slope = thermal_zone_get_slope(tz); |
91 | constant = thermal_zone_get_offset(tz); | |
359836e1 EV |
92 | |
93 | pcb_tz = data->pcb_tz; | |
445eaf87 | 94 | /* In case pcb zone is available, use the extrapolation rule with it */ |
0c12b5ac | 95 | if (!IS_ERR(pcb_tz)) { |
359836e1 EV |
96 | ret = thermal_zone_get_temp(pcb_tz, &pcb_temp); |
97 | if (!ret) { | |
98 | tmp -= pcb_temp; /* got a valid PCB temp */ | |
99 | slope = s->slope_pcb; | |
100 | constant = s->constant_pcb; | |
101 | } else { | |
102 | dev_err(bgp->dev, | |
103 | "Failed to read PCB state. Using defaults\n"); | |
df8f1347 | 104 | ret = 0; |
359836e1 | 105 | } |
445eaf87 | 106 | } |
03e859d3 | 107 | *temp = ti_thermal_hotspot_temperature(tmp, slope, constant); |
445eaf87 EV |
108 | |
109 | return ret; | |
110 | } | |
111 | ||
8289d810 | 112 | static int __ti_thermal_get_trend(struct thermal_zone_device *tz, |
ebc7abb3 RW |
113 | const struct thermal_trip *trip, |
114 | enum thermal_trend *trend) | |
03b7f67b | 115 | { |
5f68d078 | 116 | struct ti_thermal_data *data = thermal_zone_device_priv(tz); |
03b7f67b K |
117 | struct ti_bandgap *bgp; |
118 | int id, tr, ret = 0; | |
119 | ||
120 | bgp = data->bgp; | |
121 | id = data->sensor_id; | |
122 | ||
123 | ret = ti_bandgap_get_trend(bgp, id, &tr); | |
124 | if (ret) | |
125 | return ret; | |
126 | ||
127 | if (tr > 0) | |
128 | *trend = THERMAL_TREND_RAISING; | |
129 | else if (tr < 0) | |
130 | *trend = THERMAL_TREND_DROPPING; | |
131 | else | |
132 | *trend = THERMAL_TREND_STABLE; | |
133 | ||
134 | return 0; | |
135 | } | |
136 | ||
2cf3c72a | 137 | static const struct thermal_zone_device_ops ti_of_thermal_ops = { |
2251aef6 EV |
138 | .get_temp = __ti_thermal_get_temp, |
139 | .get_trend = __ti_thermal_get_trend, | |
140 | }; | |
141 | ||
03e859d3 EV |
142 | static struct ti_thermal_data |
143 | *ti_thermal_build_data(struct ti_bandgap *bgp, int id) | |
445eaf87 | 144 | { |
03e859d3 | 145 | struct ti_thermal_data *data; |
445eaf87 | 146 | |
d7f080e6 | 147 | data = devm_kzalloc(bgp->dev, sizeof(*data), GFP_KERNEL); |
445eaf87 | 148 | if (!data) { |
d7f080e6 | 149 | dev_err(bgp->dev, "kzalloc fail\n"); |
04a4d10d | 150 | return NULL; |
445eaf87 EV |
151 | } |
152 | data->sensor_id = id; | |
d7f080e6 | 153 | data->bgp = bgp; |
445eaf87 | 154 | data->mode = THERMAL_DEVICE_ENABLED; |
0c12b5ac | 155 | /* pcb_tz will be either valid or PTR_ERR() */ |
359836e1 | 156 | data->pcb_tz = thermal_zone_get_zone_by_name("pcb"); |
03e859d3 | 157 | INIT_WORK(&data->thermal_wq, ti_thermal_work); |
445eaf87 | 158 | |
04a4d10d EV |
159 | return data; |
160 | } | |
161 | ||
03e859d3 EV |
162 | int ti_thermal_expose_sensor(struct ti_bandgap *bgp, int id, |
163 | char *domain) | |
04a4d10d | 164 | { |
03e859d3 | 165 | struct ti_thermal_data *data; |
04a4d10d | 166 | |
03e859d3 | 167 | data = ti_bandgap_get_sensor_data(bgp, id); |
04a4d10d | 168 | |
0f348db0 | 169 | if (IS_ERR_OR_NULL(data)) |
03e859d3 | 170 | data = ti_thermal_build_data(bgp, id); |
04a4d10d EV |
171 | |
172 | if (!data) | |
173 | return -EINVAL; | |
174 | ||
26d9cc65 | 175 | /* in case this is specified by DT */ |
2cf3c72a | 176 | data->ti_thermal = devm_thermal_of_zone_register(bgp->dev, id, |
2251aef6 | 177 | data, &ti_of_thermal_ops); |
26d9cc65 | 178 | if (IS_ERR(data->ti_thermal)) { |
b263b473 K |
179 | dev_err(bgp->dev, "thermal zone device is NULL\n"); |
180 | return PTR_ERR(data->ti_thermal); | |
445eaf87 | 181 | } |
b263b473 | 182 | |
03e859d3 | 183 | ti_bandgap_set_sensor_data(bgp, id, data); |
0c492be4 DL |
184 | ti_bandgap_write_update_interval(bgp, data->sensor_id, |
185 | TI_BANDGAP_UPDATE_INTERVAL_MS); | |
445eaf87 | 186 | |
a4ebd423 | 187 | devm_thermal_add_hwmon_sysfs(bgp->dev, data->ti_thermal); |
3a9abd6c | 188 | |
445eaf87 EV |
189 | return 0; |
190 | } | |
191 | ||
03e859d3 | 192 | int ti_thermal_remove_sensor(struct ti_bandgap *bgp, int id) |
445eaf87 | 193 | { |
03e859d3 | 194 | struct ti_thermal_data *data; |
445eaf87 | 195 | |
03e859d3 | 196 | data = ti_bandgap_get_sensor_data(bgp, id); |
445eaf87 | 197 | |
7440f518 | 198 | if (!IS_ERR_OR_NULL(data) && data->ti_thermal) { |
26d9cc65 EV |
199 | if (data->our_zone) |
200 | thermal_zone_device_unregister(data->ti_thermal); | |
26d9cc65 | 201 | } |
445eaf87 EV |
202 | |
203 | return 0; | |
204 | } | |
205 | ||
03e859d3 | 206 | int ti_thermal_report_sensor_temperature(struct ti_bandgap *bgp, int id) |
445eaf87 | 207 | { |
03e859d3 | 208 | struct ti_thermal_data *data; |
445eaf87 | 209 | |
03e859d3 | 210 | data = ti_bandgap_get_sensor_data(bgp, id); |
445eaf87 EV |
211 | |
212 | schedule_work(&data->thermal_wq); | |
213 | ||
214 | return 0; | |
215 | } | |
216 | ||
03e859d3 | 217 | int ti_thermal_register_cpu_cooling(struct ti_bandgap *bgp, int id) |
445eaf87 | 218 | { |
03e859d3 | 219 | struct ti_thermal_data *data; |
26d9cc65 EV |
220 | struct device_node *np = bgp->dev->of_node; |
221 | ||
222 | /* | |
223 | * We are assuming here that if one deploys the zone | |
224 | * using DT, then it must be aware that the cooling device | |
225 | * loading has to happen via cpufreq driver. | |
226 | */ | |
86df7d19 | 227 | if (of_property_present(np, "#thermal-sensor-cells")) |
26d9cc65 | 228 | return 0; |
445eaf87 | 229 | |
03e859d3 | 230 | data = ti_bandgap_get_sensor_data(bgp, id); |
0c12b5ac | 231 | if (!data || IS_ERR(data)) |
03e859d3 | 232 | data = ti_thermal_build_data(bgp, id); |
04a4d10d EV |
233 | |
234 | if (!data) | |
235 | return -EINVAL; | |
445eaf87 | 236 | |
4d753aa7 VK |
237 | data->policy = cpufreq_cpu_get(0); |
238 | if (!data->policy) { | |
239 | pr_debug("%s: CPUFreq policy not found\n", __func__); | |
240 | return -EPROBE_DEFER; | |
241 | } | |
242 | ||
445eaf87 | 243 | /* Register cooling device */ |
4d753aa7 | 244 | data->cool_dev = cpufreq_cooling_register(data->policy); |
0c12b5ac | 245 | if (IS_ERR(data->cool_dev)) { |
cffafc32 | 246 | int ret = PTR_ERR(data->cool_dev); |
4d753aa7 VK |
247 | dev_err(bgp->dev, "Failed to register cpu cooling device %d\n", |
248 | ret); | |
249 | cpufreq_cpu_put(data->policy); | |
cffafc32 EV |
250 | |
251 | return ret; | |
445eaf87 | 252 | } |
03e859d3 | 253 | ti_bandgap_set_sensor_data(bgp, id, data); |
445eaf87 EV |
254 | |
255 | return 0; | |
256 | } | |
257 | ||
03e859d3 | 258 | int ti_thermal_unregister_cpu_cooling(struct ti_bandgap *bgp, int id) |
445eaf87 | 259 | { |
03e859d3 | 260 | struct ti_thermal_data *data; |
445eaf87 | 261 | |
03e859d3 | 262 | data = ti_bandgap_get_sensor_data(bgp, id); |
26d9cc65 | 263 | |
7440f518 | 264 | if (!IS_ERR_OR_NULL(data)) { |
26d9cc65 | 265 | cpufreq_cooling_unregister(data->cool_dev); |
ba817a8c TL |
266 | if (data->policy) |
267 | cpufreq_cpu_put(data->policy); | |
4d753aa7 | 268 | } |
445eaf87 EV |
269 | |
270 | return 0; | |
271 | } |