Merge tag 'drm-intel-next-2019-04-04' into gvt-next
[platform/kernel/linux-rpi.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 <hayashi.kunihiko@socionext.com>
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/of_device.h>
16 #include <linux/platform_device.h>
17 #include <linux/regmap.h>
18 #include <linux/thermal.h>
19
20 #include "thermal_core.h"
21
22 /*
23  * block registers
24  * addresses are the offset from .block_base
25  */
26 #define PVTCTLEN                        0x0000
27 #define PVTCTLEN_EN                     BIT(0)
28
29 #define PVTCTLMODE                      0x0004
30 #define PVTCTLMODE_MASK                 0xf
31 #define PVTCTLMODE_TEMPMON              0x5
32
33 #define EMONREPEAT                      0x0040
34 #define EMONREPEAT_ENDLESS              BIT(24)
35 #define EMONREPEAT_PERIOD               GENMASK(3, 0)
36 #define EMONREPEAT_PERIOD_1000000       0x9
37
38 /*
39  * common registers
40  * addresses are the offset from .map_base
41  */
42 #define PVTCTLSEL                       0x0900
43 #define PVTCTLSEL_MASK                  GENMASK(2, 0)
44 #define PVTCTLSEL_MONITOR               0
45
46 #define SETALERT0                       0x0910
47 #define SETALERT1                       0x0914
48 #define SETALERT2                       0x0918
49 #define SETALERT_TEMP_OVF               (GENMASK(7, 0) << 16)
50 #define SETALERT_TEMP_OVF_VALUE(val)    (((val) & GENMASK(7, 0)) << 16)
51 #define SETALERT_EN                     BIT(0)
52
53 #define PMALERTINTCTL                   0x0920
54 #define PMALERTINTCTL_CLR(ch)           BIT(4 * (ch) + 2)
55 #define PMALERTINTCTL_SET(ch)           BIT(4 * (ch) + 1)
56 #define PMALERTINTCTL_EN(ch)            BIT(4 * (ch) + 0)
57 #define PMALERTINTCTL_MASK              (GENMASK(10, 8) | GENMASK(6, 4) | \
58                                          GENMASK(2, 0))
59
60 #define TMOD                            0x0928
61 #define TMOD_WIDTH                      9
62
63 #define TMODCOEF                        0x0e5c
64
65 #define TMODSETUP0_EN                   BIT(30)
66 #define TMODSETUP0_VAL(val)             (((val) & GENMASK(13, 0)) << 16)
67 #define TMODSETUP1_EN                   BIT(15)
68 #define TMODSETUP1_VAL(val)             ((val) & GENMASK(14, 0))
69
70 /* SoC critical temperature */
71 #define CRITICAL_TEMP_LIMIT             (120 * 1000)
72
73 /* Max # of alert channels */
74 #define ALERT_CH_NUM                    3
75
76 /* SoC specific thermal sensor data */
77 struct uniphier_tm_soc_data {
78         u32 map_base;
79         u32 block_base;
80         u32 tmod_setup_addr;
81 };
82
83 struct uniphier_tm_dev {
84         struct regmap *regmap;
85         struct device *dev;
86         bool alert_en[ALERT_CH_NUM];
87         struct thermal_zone_device *tz_dev;
88         const struct uniphier_tm_soc_data *data;
89 };
90
91 static int uniphier_tm_initialize_sensor(struct uniphier_tm_dev *tdev)
92 {
93         struct regmap *map = tdev->regmap;
94         u32 val;
95         u32 tmod_calib[2];
96         int ret;
97
98         /* stop PVT */
99         regmap_write_bits(map, tdev->data->block_base + PVTCTLEN,
100                           PVTCTLEN_EN, 0);
101
102         /*
103          * Since SoC has a calibrated value that was set in advance,
104          * TMODCOEF shows non-zero and PVT refers the value internally.
105          *
106          * If TMODCOEF shows zero, the boards don't have the calibrated
107          * value, and the driver has to set default value from DT.
108          */
109         ret = regmap_read(map, tdev->data->map_base + TMODCOEF, &val);
110         if (ret)
111                 return ret;
112         if (!val) {
113                 /* look for the default values in DT */
114                 ret = of_property_read_u32_array(tdev->dev->of_node,
115                                                  "socionext,tmod-calibration",
116                                                  tmod_calib,
117                                                  ARRAY_SIZE(tmod_calib));
118                 if (ret)
119                         return ret;
120
121                 regmap_write(map, tdev->data->tmod_setup_addr,
122                         TMODSETUP0_EN | TMODSETUP0_VAL(tmod_calib[0]) |
123                         TMODSETUP1_EN | TMODSETUP1_VAL(tmod_calib[1]));
124         }
125
126         /* select temperature mode */
127         regmap_write_bits(map, tdev->data->block_base + PVTCTLMODE,
128                           PVTCTLMODE_MASK, PVTCTLMODE_TEMPMON);
129
130         /* set monitoring period */
131         regmap_write_bits(map, tdev->data->block_base + EMONREPEAT,
132                           EMONREPEAT_ENDLESS | EMONREPEAT_PERIOD,
133                           EMONREPEAT_ENDLESS | EMONREPEAT_PERIOD_1000000);
134
135         /* set monitor mode */
136         regmap_write_bits(map, tdev->data->map_base + PVTCTLSEL,
137                           PVTCTLSEL_MASK, PVTCTLSEL_MONITOR);
138
139         return 0;
140 }
141
142 static void uniphier_tm_set_alert(struct uniphier_tm_dev *tdev, u32 ch,
143                                   u32 temp)
144 {
145         struct regmap *map = tdev->regmap;
146
147         /* set alert temperature */
148         regmap_write_bits(map, tdev->data->map_base + SETALERT0 + (ch << 2),
149                           SETALERT_EN | SETALERT_TEMP_OVF,
150                           SETALERT_EN |
151                           SETALERT_TEMP_OVF_VALUE(temp / 1000));
152 }
153
154 static void uniphier_tm_enable_sensor(struct uniphier_tm_dev *tdev)
155 {
156         struct regmap *map = tdev->regmap;
157         int i;
158         u32 bits = 0;
159
160         for (i = 0; i < ALERT_CH_NUM; i++)
161                 if (tdev->alert_en[i])
162                         bits |= PMALERTINTCTL_EN(i);
163
164         /* enable alert interrupt */
165         regmap_write_bits(map, tdev->data->map_base + PMALERTINTCTL,
166                           PMALERTINTCTL_MASK, bits);
167
168         /* start PVT */
169         regmap_write_bits(map, tdev->data->block_base + PVTCTLEN,
170                           PVTCTLEN_EN, PVTCTLEN_EN);
171
172         usleep_range(700, 1500);        /* The spec note says at least 700us */
173 }
174
175 static void uniphier_tm_disable_sensor(struct uniphier_tm_dev *tdev)
176 {
177         struct regmap *map = tdev->regmap;
178
179         /* disable alert interrupt */
180         regmap_write_bits(map, tdev->data->map_base + PMALERTINTCTL,
181                           PMALERTINTCTL_MASK, 0);
182
183         /* stop PVT */
184         regmap_write_bits(map, tdev->data->block_base + PVTCTLEN,
185                           PVTCTLEN_EN, 0);
186
187         usleep_range(1000, 2000);       /* The spec note says at least 1ms */
188 }
189
190 static int uniphier_tm_get_temp(void *data, int *out_temp)
191 {
192         struct uniphier_tm_dev *tdev = data;
193         struct regmap *map = tdev->regmap;
194         int ret;
195         u32 temp;
196
197         ret = regmap_read(map, tdev->data->map_base + TMOD, &temp);
198         if (ret)
199                 return ret;
200
201         /* MSB of the TMOD field is a sign bit */
202         *out_temp = sign_extend32(temp, TMOD_WIDTH - 1) * 1000;
203
204         return 0;
205 }
206
207 static const struct thermal_zone_of_device_ops uniphier_of_thermal_ops = {
208         .get_temp = uniphier_tm_get_temp,
209 };
210
211 static void uniphier_tm_irq_clear(struct uniphier_tm_dev *tdev)
212 {
213         u32 mask = 0, bits = 0;
214         int i;
215
216         for (i = 0; i < ALERT_CH_NUM; i++) {
217                 mask |= (PMALERTINTCTL_CLR(i) | PMALERTINTCTL_SET(i));
218                 bits |= PMALERTINTCTL_CLR(i);
219         }
220
221         /* clear alert interrupt */
222         regmap_write_bits(tdev->regmap,
223                           tdev->data->map_base + PMALERTINTCTL, mask, bits);
224 }
225
226 static irqreturn_t uniphier_tm_alarm_irq(int irq, void *_tdev)
227 {
228         struct uniphier_tm_dev *tdev = _tdev;
229
230         disable_irq_nosync(irq);
231         uniphier_tm_irq_clear(tdev);
232
233         return IRQ_WAKE_THREAD;
234 }
235
236 static irqreturn_t uniphier_tm_alarm_irq_thread(int irq, void *_tdev)
237 {
238         struct uniphier_tm_dev *tdev = _tdev;
239
240         thermal_zone_device_update(tdev->tz_dev, THERMAL_EVENT_UNSPECIFIED);
241
242         return IRQ_HANDLED;
243 }
244
245 static int uniphier_tm_probe(struct platform_device *pdev)
246 {
247         struct device *dev = &pdev->dev;
248         struct regmap *regmap;
249         struct device_node *parent;
250         struct uniphier_tm_dev *tdev;
251         const struct thermal_trip *trips;
252         int i, ret, irq, ntrips, crit_temp = INT_MAX;
253
254         tdev = devm_kzalloc(dev, sizeof(*tdev), GFP_KERNEL);
255         if (!tdev)
256                 return -ENOMEM;
257         tdev->dev = dev;
258
259         tdev->data = of_device_get_match_data(dev);
260         if (WARN_ON(!tdev->data))
261                 return -EINVAL;
262
263         irq = platform_get_irq(pdev, 0);
264         if (irq < 0)
265                 return irq;
266
267         /* get regmap from syscon node */
268         parent = of_get_parent(dev->of_node); /* parent should be syscon node */
269         regmap = syscon_node_to_regmap(parent);
270         of_node_put(parent);
271         if (IS_ERR(regmap)) {
272                 dev_err(dev, "failed to get regmap (error %ld)\n",
273                         PTR_ERR(regmap));
274                 return PTR_ERR(regmap);
275         }
276         tdev->regmap = regmap;
277
278         ret = uniphier_tm_initialize_sensor(tdev);
279         if (ret) {
280                 dev_err(dev, "failed to initialize sensor\n");
281                 return ret;
282         }
283
284         ret = devm_request_threaded_irq(dev, irq, uniphier_tm_alarm_irq,
285                                         uniphier_tm_alarm_irq_thread,
286                                         0, "thermal", tdev);
287         if (ret)
288                 return ret;
289
290         platform_set_drvdata(pdev, tdev);
291
292         tdev->tz_dev = devm_thermal_zone_of_sensor_register(dev, 0, tdev,
293                                                 &uniphier_of_thermal_ops);
294         if (IS_ERR(tdev->tz_dev)) {
295                 dev_err(dev, "failed to register sensor device\n");
296                 return PTR_ERR(tdev->tz_dev);
297         }
298
299         /* get trip points */
300         trips = of_thermal_get_trip_points(tdev->tz_dev);
301         ntrips = of_thermal_get_ntrips(tdev->tz_dev);
302         if (ntrips > ALERT_CH_NUM) {
303                 dev_err(dev, "thermal zone has too many trips\n");
304                 return -E2BIG;
305         }
306
307         /* set alert temperatures */
308         for (i = 0; i < ntrips; i++) {
309                 if (trips[i].type == THERMAL_TRIP_CRITICAL &&
310                     trips[i].temperature < crit_temp)
311                         crit_temp = trips[i].temperature;
312                 uniphier_tm_set_alert(tdev, i, trips[i].temperature);
313                 tdev->alert_en[i] = true;
314         }
315         if (crit_temp > CRITICAL_TEMP_LIMIT) {
316                 dev_err(dev, "critical trip is over limit(>%d), or not set\n",
317                         CRITICAL_TEMP_LIMIT);
318                 return -EINVAL;
319         }
320
321         uniphier_tm_enable_sensor(tdev);
322
323         return 0;
324 }
325
326 static int uniphier_tm_remove(struct platform_device *pdev)
327 {
328         struct uniphier_tm_dev *tdev = platform_get_drvdata(pdev);
329
330         /* disable sensor */
331         uniphier_tm_disable_sensor(tdev);
332
333         return 0;
334 }
335
336 static const struct uniphier_tm_soc_data uniphier_pxs2_tm_data = {
337         .map_base        = 0xe000,
338         .block_base      = 0xe000,
339         .tmod_setup_addr = 0xe904,
340 };
341
342 static const struct uniphier_tm_soc_data uniphier_ld20_tm_data = {
343         .map_base        = 0xe000,
344         .block_base      = 0xe800,
345         .tmod_setup_addr = 0xe938,
346 };
347
348 static const struct of_device_id uniphier_tm_dt_ids[] = {
349         {
350                 .compatible = "socionext,uniphier-pxs2-thermal",
351                 .data       = &uniphier_pxs2_tm_data,
352         },
353         {
354                 .compatible = "socionext,uniphier-ld20-thermal",
355                 .data       = &uniphier_ld20_tm_data,
356         },
357         {
358                 .compatible = "socionext,uniphier-pxs3-thermal",
359                 .data       = &uniphier_ld20_tm_data,
360         },
361         { /* sentinel */ }
362 };
363 MODULE_DEVICE_TABLE(of, uniphier_tm_dt_ids);
364
365 static struct platform_driver uniphier_tm_driver = {
366         .probe = uniphier_tm_probe,
367         .remove = uniphier_tm_remove,
368         .driver = {
369                 .name = "uniphier-thermal",
370                 .of_match_table = uniphier_tm_dt_ids,
371         },
372 };
373 module_platform_driver(uniphier_tm_driver);
374
375 MODULE_AUTHOR("Kunihiko Hayashi <hayashi.kunihiko@socionext.com>");
376 MODULE_DESCRIPTION("UniPhier thermal driver");
377 MODULE_LICENSE("GPL v2");