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[J-linux.git] / drivers / thermal / uniphier_thermal.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * uniphier_thermal.c - Socionext UniPhier thermal driver
4  * Copyright 2014      Panasonic Corporation
5  * Copyright 2016-2017 Socionext Inc.
6  * Author:
7  *      Kunihiko Hayashi <[email protected]>
8  */
9
10 #include <linux/bitops.h>
11 #include <linux/interrupt.h>
12 #include <linux/mfd/syscon.h>
13 #include <linux/module.h>
14 #include <linux/of.h>
15 #include <linux/platform_device.h>
16 #include <linux/regmap.h>
17 #include <linux/thermal.h>
18
19 /*
20  * block registers
21  * addresses are the offset from .block_base
22  */
23 #define PVTCTLEN                        0x0000
24 #define PVTCTLEN_EN                     BIT(0)
25
26 #define PVTCTLMODE                      0x0004
27 #define PVTCTLMODE_MASK                 0xf
28 #define PVTCTLMODE_TEMPMON              0x5
29
30 #define EMONREPEAT                      0x0040
31 #define EMONREPEAT_ENDLESS              BIT(24)
32 #define EMONREPEAT_PERIOD               GENMASK(3, 0)
33 #define EMONREPEAT_PERIOD_1000000       0x9
34
35 /*
36  * common registers
37  * addresses are the offset from .map_base
38  */
39 #define PVTCTLSEL                       0x0900
40 #define PVTCTLSEL_MASK                  GENMASK(2, 0)
41 #define PVTCTLSEL_MONITOR               0
42
43 #define SETALERT0                       0x0910
44 #define SETALERT1                       0x0914
45 #define SETALERT2                       0x0918
46 #define SETALERT_TEMP_OVF               (GENMASK(7, 0) << 16)
47 #define SETALERT_TEMP_OVF_VALUE(val)    (((val) & GENMASK(7, 0)) << 16)
48 #define SETALERT_EN                     BIT(0)
49
50 #define PMALERTINTCTL                   0x0920
51 #define PMALERTINTCTL_CLR(ch)           BIT(4 * (ch) + 2)
52 #define PMALERTINTCTL_SET(ch)           BIT(4 * (ch) + 1)
53 #define PMALERTINTCTL_EN(ch)            BIT(4 * (ch) + 0)
54 #define PMALERTINTCTL_MASK              (GENMASK(10, 8) | GENMASK(6, 4) | \
55                                          GENMASK(2, 0))
56
57 #define TMOD                            0x0928
58 #define TMOD_WIDTH                      9
59
60 #define TMODCOEF                        0x0e5c
61
62 #define TMODSETUP0_EN                   BIT(30)
63 #define TMODSETUP0_VAL(val)             (((val) & GENMASK(13, 0)) << 16)
64 #define TMODSETUP1_EN                   BIT(15)
65 #define TMODSETUP1_VAL(val)             ((val) & GENMASK(14, 0))
66
67 /* SoC critical temperature */
68 #define CRITICAL_TEMP_LIMIT             (120 * 1000)
69
70 /* Max # of alert channels */
71 #define ALERT_CH_NUM                    3
72
73 /* SoC specific thermal sensor data */
74 struct uniphier_tm_soc_data {
75         u32 map_base;
76         u32 block_base;
77         u32 tmod_setup_addr;
78 };
79
80 struct uniphier_tm_dev {
81         struct regmap *regmap;
82         struct device *dev;
83         bool alert_en[ALERT_CH_NUM];
84         struct thermal_zone_device *tz_dev;
85         const struct uniphier_tm_soc_data *data;
86 };
87
88 static int uniphier_tm_initialize_sensor(struct uniphier_tm_dev *tdev)
89 {
90         struct regmap *map = tdev->regmap;
91         u32 val;
92         u32 tmod_calib[2];
93         int ret;
94
95         /* stop PVT */
96         regmap_write_bits(map, tdev->data->block_base + PVTCTLEN,
97                           PVTCTLEN_EN, 0);
98
99         /*
100          * Since SoC has a calibrated value that was set in advance,
101          * TMODCOEF shows non-zero and PVT refers the value internally.
102          *
103          * If TMODCOEF shows zero, the boards don't have the calibrated
104          * value, and the driver has to set default value from DT.
105          */
106         ret = regmap_read(map, tdev->data->map_base + TMODCOEF, &val);
107         if (ret)
108                 return ret;
109         if (!val) {
110                 /* look for the default values in DT */
111                 ret = of_property_read_u32_array(tdev->dev->of_node,
112                                                  "socionext,tmod-calibration",
113                                                  tmod_calib,
114                                                  ARRAY_SIZE(tmod_calib));
115                 if (ret)
116                         return ret;
117
118                 regmap_write(map, tdev->data->tmod_setup_addr,
119                         TMODSETUP0_EN | TMODSETUP0_VAL(tmod_calib[0]) |
120                         TMODSETUP1_EN | TMODSETUP1_VAL(tmod_calib[1]));
121         }
122
123         /* select temperature mode */
124         regmap_write_bits(map, tdev->data->block_base + PVTCTLMODE,
125                           PVTCTLMODE_MASK, PVTCTLMODE_TEMPMON);
126
127         /* set monitoring period */
128         regmap_write_bits(map, tdev->data->block_base + EMONREPEAT,
129                           EMONREPEAT_ENDLESS | EMONREPEAT_PERIOD,
130                           EMONREPEAT_ENDLESS | EMONREPEAT_PERIOD_1000000);
131
132         /* set monitor mode */
133         regmap_write_bits(map, tdev->data->map_base + PVTCTLSEL,
134                           PVTCTLSEL_MASK, PVTCTLSEL_MONITOR);
135
136         return 0;
137 }
138
139 static void uniphier_tm_set_alert(struct uniphier_tm_dev *tdev, u32 ch,
140                                   u32 temp)
141 {
142         struct regmap *map = tdev->regmap;
143
144         /* set alert temperature */
145         regmap_write_bits(map, tdev->data->map_base + SETALERT0 + (ch << 2),
146                           SETALERT_EN | SETALERT_TEMP_OVF,
147                           SETALERT_EN |
148                           SETALERT_TEMP_OVF_VALUE(temp / 1000));
149 }
150
151 static void uniphier_tm_enable_sensor(struct uniphier_tm_dev *tdev)
152 {
153         struct regmap *map = tdev->regmap;
154         int i;
155         u32 bits = 0;
156
157         for (i = 0; i < ALERT_CH_NUM; i++)
158                 if (tdev->alert_en[i])
159                         bits |= PMALERTINTCTL_EN(i);
160
161         /* enable alert interrupt */
162         regmap_write_bits(map, tdev->data->map_base + PMALERTINTCTL,
163                           PMALERTINTCTL_MASK, bits);
164
165         /* start PVT */
166         regmap_write_bits(map, tdev->data->block_base + PVTCTLEN,
167                           PVTCTLEN_EN, PVTCTLEN_EN);
168
169         usleep_range(700, 1500);        /* The spec note says at least 700us */
170 }
171
172 static void uniphier_tm_disable_sensor(struct uniphier_tm_dev *tdev)
173 {
174         struct regmap *map = tdev->regmap;
175
176         /* disable alert interrupt */
177         regmap_write_bits(map, tdev->data->map_base + PMALERTINTCTL,
178                           PMALERTINTCTL_MASK, 0);
179
180         /* stop PVT */
181         regmap_write_bits(map, tdev->data->block_base + PVTCTLEN,
182                           PVTCTLEN_EN, 0);
183
184         usleep_range(1000, 2000);       /* The spec note says at least 1ms */
185 }
186
187 static int uniphier_tm_get_temp(struct thermal_zone_device *tz, int *out_temp)
188 {
189         struct uniphier_tm_dev *tdev = thermal_zone_device_priv(tz);
190         struct regmap *map = tdev->regmap;
191         int ret;
192         u32 temp;
193
194         ret = regmap_read(map, tdev->data->map_base + TMOD, &temp);
195         if (ret)
196                 return ret;
197
198         /* MSB of the TMOD field is a sign bit */
199         *out_temp = sign_extend32(temp, TMOD_WIDTH - 1) * 1000;
200
201         return 0;
202 }
203
204 static const struct thermal_zone_device_ops uniphier_of_thermal_ops = {
205         .get_temp = uniphier_tm_get_temp,
206 };
207
208 static void uniphier_tm_irq_clear(struct uniphier_tm_dev *tdev)
209 {
210         u32 mask = 0, bits = 0;
211         int i;
212
213         for (i = 0; i < ALERT_CH_NUM; i++) {
214                 mask |= (PMALERTINTCTL_CLR(i) | PMALERTINTCTL_SET(i));
215                 bits |= PMALERTINTCTL_CLR(i);
216         }
217
218         /* clear alert interrupt */
219         regmap_write_bits(tdev->regmap,
220                           tdev->data->map_base + PMALERTINTCTL, mask, bits);
221 }
222
223 static irqreturn_t uniphier_tm_alarm_irq(int irq, void *_tdev)
224 {
225         struct uniphier_tm_dev *tdev = _tdev;
226
227         disable_irq_nosync(irq);
228         uniphier_tm_irq_clear(tdev);
229
230         return IRQ_WAKE_THREAD;
231 }
232
233 static irqreturn_t uniphier_tm_alarm_irq_thread(int irq, void *_tdev)
234 {
235         struct uniphier_tm_dev *tdev = _tdev;
236
237         thermal_zone_device_update(tdev->tz_dev, THERMAL_EVENT_UNSPECIFIED);
238
239         return IRQ_HANDLED;
240 }
241
242 struct trip_walk_data {
243         struct uniphier_tm_dev *tdev;
244         int crit_temp;
245         int index;
246 };
247
248 static int uniphier_tm_trip_walk_cb(struct thermal_trip *trip, void *arg)
249 {
250         struct trip_walk_data *twd = arg;
251
252         if (trip->type == THERMAL_TRIP_CRITICAL &&
253             trip->temperature < twd->crit_temp)
254                 twd->crit_temp = trip->temperature;
255
256         uniphier_tm_set_alert(twd->tdev, twd->index, trip->temperature);
257         twd->tdev->alert_en[twd->index++] = true;
258
259         return 0;
260 }
261
262 static int uniphier_tm_probe(struct platform_device *pdev)
263 {
264         struct trip_walk_data twd = { .crit_temp = INT_MAX, .index = 0 };
265         struct device *dev = &pdev->dev;
266         struct regmap *regmap;
267         struct device_node *parent;
268         struct uniphier_tm_dev *tdev;
269         int ret, irq;
270
271         tdev = devm_kzalloc(dev, sizeof(*tdev), GFP_KERNEL);
272         if (!tdev)
273                 return -ENOMEM;
274         tdev->dev = dev;
275
276         tdev->data = of_device_get_match_data(dev);
277         if (WARN_ON(!tdev->data))
278                 return -EINVAL;
279
280         irq = platform_get_irq(pdev, 0);
281         if (irq < 0)
282                 return irq;
283
284         /* get regmap from syscon node */
285         parent = of_get_parent(dev->of_node); /* parent should be syscon node */
286         regmap = syscon_node_to_regmap(parent);
287         of_node_put(parent);
288         if (IS_ERR(regmap)) {
289                 dev_err(dev, "failed to get regmap (error %ld)\n",
290                         PTR_ERR(regmap));
291                 return PTR_ERR(regmap);
292         }
293         tdev->regmap = regmap;
294
295         ret = uniphier_tm_initialize_sensor(tdev);
296         if (ret) {
297                 dev_err(dev, "failed to initialize sensor\n");
298                 return ret;
299         }
300
301         ret = devm_request_threaded_irq(dev, irq, uniphier_tm_alarm_irq,
302                                         uniphier_tm_alarm_irq_thread,
303                                         0, "thermal", tdev);
304         if (ret)
305                 return ret;
306
307         platform_set_drvdata(pdev, tdev);
308
309         tdev->tz_dev = devm_thermal_of_zone_register(dev, 0, tdev,
310                                                      &uniphier_of_thermal_ops);
311         if (IS_ERR(tdev->tz_dev)) {
312                 dev_err(dev, "failed to register sensor device\n");
313                 return PTR_ERR(tdev->tz_dev);
314         }
315
316         /* set alert temperatures */
317         twd.tdev = tdev;
318         thermal_zone_for_each_trip(tdev->tz_dev, uniphier_tm_trip_walk_cb, &twd);
319
320         if (twd.crit_temp > CRITICAL_TEMP_LIMIT) {
321                 dev_err(dev, "critical trip is over limit(>%d), or not set\n",
322                         CRITICAL_TEMP_LIMIT);
323                 return -EINVAL;
324         }
325
326         uniphier_tm_enable_sensor(tdev);
327
328         return 0;
329 }
330
331 static void uniphier_tm_remove(struct platform_device *pdev)
332 {
333         struct uniphier_tm_dev *tdev = platform_get_drvdata(pdev);
334
335         /* disable sensor */
336         uniphier_tm_disable_sensor(tdev);
337 }
338
339 static const struct uniphier_tm_soc_data uniphier_pxs2_tm_data = {
340         .map_base        = 0xe000,
341         .block_base      = 0xe000,
342         .tmod_setup_addr = 0xe904,
343 };
344
345 static const struct uniphier_tm_soc_data uniphier_ld20_tm_data = {
346         .map_base        = 0xe000,
347         .block_base      = 0xe800,
348         .tmod_setup_addr = 0xe938,
349 };
350
351 static const struct of_device_id uniphier_tm_dt_ids[] = {
352         {
353                 .compatible = "socionext,uniphier-pxs2-thermal",
354                 .data       = &uniphier_pxs2_tm_data,
355         },
356         {
357                 .compatible = "socionext,uniphier-ld20-thermal",
358                 .data       = &uniphier_ld20_tm_data,
359         },
360         {
361                 .compatible = "socionext,uniphier-pxs3-thermal",
362                 .data       = &uniphier_ld20_tm_data,
363         },
364         {
365                 .compatible = "socionext,uniphier-nx1-thermal",
366                 .data       = &uniphier_ld20_tm_data,
367         },
368         { /* sentinel */ }
369 };
370 MODULE_DEVICE_TABLE(of, uniphier_tm_dt_ids);
371
372 static struct platform_driver uniphier_tm_driver = {
373         .probe = uniphier_tm_probe,
374         .remove = uniphier_tm_remove,
375         .driver = {
376                 .name = "uniphier-thermal",
377                 .of_match_table = uniphier_tm_dt_ids,
378         },
379 };
380 module_platform_driver(uniphier_tm_driver);
381
382 MODULE_AUTHOR("Kunihiko Hayashi <[email protected]>");
383 MODULE_DESCRIPTION("UniPhier thermal driver");
384 MODULE_LICENSE("GPL v2");
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