Commit | Line | Data |
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ca3de46b SG |
1 | /* |
2 | * Copyright 2013 Freescale Semiconductor, Inc. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | */ | |
9 | ||
329fe7b1 | 10 | #include <linux/clk.h> |
4d753aa7 | 11 | #include <linux/cpufreq.h> |
ca3de46b | 12 | #include <linux/cpu_cooling.h> |
ca3de46b SG |
13 | #include <linux/delay.h> |
14 | #include <linux/device.h> | |
15 | #include <linux/init.h> | |
37713a1e | 16 | #include <linux/interrupt.h> |
ca3de46b SG |
17 | #include <linux/io.h> |
18 | #include <linux/kernel.h> | |
19 | #include <linux/mfd/syscon.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/of.h> | |
3c94f17e | 22 | #include <linux/of_device.h> |
ca3de46b SG |
23 | #include <linux/platform_device.h> |
24 | #include <linux/regmap.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/thermal.h> | |
27 | #include <linux/types.h> | |
28 | ||
29 | #define REG_SET 0x4 | |
30 | #define REG_CLR 0x8 | |
31 | #define REG_TOG 0xc | |
32 | ||
33 | #define MISC0 0x0150 | |
34 | #define MISC0_REFTOP_SELBIASOFF (1 << 3) | |
3c94f17e AH |
35 | #define MISC1 0x0160 |
36 | #define MISC1_IRQ_TEMPHIGH (1 << 29) | |
37 | /* Below LOW and PANIC bits are only for TEMPMON_IMX6SX */ | |
38 | #define MISC1_IRQ_TEMPLOW (1 << 28) | |
39 | #define MISC1_IRQ_TEMPPANIC (1 << 27) | |
ca3de46b SG |
40 | |
41 | #define TEMPSENSE0 0x0180 | |
37713a1e PZ |
42 | #define TEMPSENSE0_ALARM_VALUE_SHIFT 20 |
43 | #define TEMPSENSE0_ALARM_VALUE_MASK (0xfff << TEMPSENSE0_ALARM_VALUE_SHIFT) | |
ca3de46b SG |
44 | #define TEMPSENSE0_TEMP_CNT_SHIFT 8 |
45 | #define TEMPSENSE0_TEMP_CNT_MASK (0xfff << TEMPSENSE0_TEMP_CNT_SHIFT) | |
46 | #define TEMPSENSE0_FINISHED (1 << 2) | |
47 | #define TEMPSENSE0_MEASURE_TEMP (1 << 1) | |
48 | #define TEMPSENSE0_POWER_DOWN (1 << 0) | |
49 | ||
50 | #define TEMPSENSE1 0x0190 | |
51 | #define TEMPSENSE1_MEASURE_FREQ 0xffff | |
3c94f17e AH |
52 | /* Below TEMPSENSE2 is only for TEMPMON_IMX6SX */ |
53 | #define TEMPSENSE2 0x0290 | |
54 | #define TEMPSENSE2_LOW_VALUE_SHIFT 0 | |
55 | #define TEMPSENSE2_LOW_VALUE_MASK 0xfff | |
56 | #define TEMPSENSE2_PANIC_VALUE_SHIFT 16 | |
57 | #define TEMPSENSE2_PANIC_VALUE_MASK 0xfff0000 | |
ca3de46b | 58 | |
a2291bad | 59 | #define OCOTP_MEM0 0x0480 |
ca3de46b SG |
60 | #define OCOTP_ANA1 0x04e0 |
61 | ||
62 | /* The driver supports 1 passive trip point and 1 critical trip point */ | |
63 | enum imx_thermal_trip { | |
64 | IMX_TRIP_PASSIVE, | |
65 | IMX_TRIP_CRITICAL, | |
66 | IMX_TRIP_NUM, | |
67 | }; | |
68 | ||
ca3de46b SG |
69 | #define IMX_POLLING_DELAY 2000 /* millisecond */ |
70 | #define IMX_PASSIVE_DELAY 1000 | |
71 | ||
749e8be7 AH |
72 | #define FACTOR0 10000000 |
73 | #define FACTOR1 15976 | |
74 | #define FACTOR2 4297157 | |
75 | ||
3c94f17e AH |
76 | #define TEMPMON_IMX6Q 1 |
77 | #define TEMPMON_IMX6SX 2 | |
78 | ||
79 | struct thermal_soc_data { | |
80 | u32 version; | |
81 | }; | |
82 | ||
83 | static struct thermal_soc_data thermal_imx6q_data = { | |
84 | .version = TEMPMON_IMX6Q, | |
85 | }; | |
86 | ||
87 | static struct thermal_soc_data thermal_imx6sx_data = { | |
88 | .version = TEMPMON_IMX6SX, | |
89 | }; | |
90 | ||
ca3de46b | 91 | struct imx_thermal_data { |
4d753aa7 | 92 | struct cpufreq_policy *policy; |
ca3de46b SG |
93 | struct thermal_zone_device *tz; |
94 | struct thermal_cooling_device *cdev; | |
95 | enum thermal_device_mode mode; | |
96 | struct regmap *tempmon; | |
749e8be7 | 97 | u32 c1, c2; /* See formula in imx_get_sensor_data() */ |
17e8351a SH |
98 | int temp_passive; |
99 | int temp_critical; | |
a2291bad | 100 | int temp_max; |
17e8351a SH |
101 | int alarm_temp; |
102 | int last_temp; | |
37713a1e PZ |
103 | bool irq_enabled; |
104 | int irq; | |
329fe7b1 | 105 | struct clk *thermal_clk; |
3c94f17e | 106 | const struct thermal_soc_data *socdata; |
a2291bad | 107 | const char *temp_grade; |
ca3de46b SG |
108 | }; |
109 | ||
3c94f17e | 110 | static void imx_set_panic_temp(struct imx_thermal_data *data, |
17e8351a | 111 | int panic_temp) |
3c94f17e AH |
112 | { |
113 | struct regmap *map = data->tempmon; | |
114 | int critical_value; | |
115 | ||
116 | critical_value = (data->c2 - panic_temp) / data->c1; | |
117 | regmap_write(map, TEMPSENSE2 + REG_CLR, TEMPSENSE2_PANIC_VALUE_MASK); | |
118 | regmap_write(map, TEMPSENSE2 + REG_SET, critical_value << | |
119 | TEMPSENSE2_PANIC_VALUE_SHIFT); | |
120 | } | |
121 | ||
37713a1e | 122 | static void imx_set_alarm_temp(struct imx_thermal_data *data, |
17e8351a | 123 | int alarm_temp) |
37713a1e PZ |
124 | { |
125 | struct regmap *map = data->tempmon; | |
126 | int alarm_value; | |
127 | ||
128 | data->alarm_temp = alarm_temp; | |
749e8be7 | 129 | alarm_value = (data->c2 - alarm_temp) / data->c1; |
37713a1e PZ |
130 | regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_ALARM_VALUE_MASK); |
131 | regmap_write(map, TEMPSENSE0 + REG_SET, alarm_value << | |
132 | TEMPSENSE0_ALARM_VALUE_SHIFT); | |
133 | } | |
134 | ||
17e8351a | 135 | static int imx_get_temp(struct thermal_zone_device *tz, int *temp) |
ca3de46b SG |
136 | { |
137 | struct imx_thermal_data *data = tz->devdata; | |
138 | struct regmap *map = data->tempmon; | |
ca3de46b | 139 | unsigned int n_meas; |
37713a1e | 140 | bool wait; |
ca3de46b SG |
141 | u32 val; |
142 | ||
37713a1e PZ |
143 | if (data->mode == THERMAL_DEVICE_ENABLED) { |
144 | /* Check if a measurement is currently in progress */ | |
145 | regmap_read(map, TEMPSENSE0, &val); | |
146 | wait = !(val & TEMPSENSE0_FINISHED); | |
147 | } else { | |
148 | /* | |
149 | * Every time we measure the temperature, we will power on the | |
150 | * temperature sensor, enable measurements, take a reading, | |
151 | * disable measurements, power off the temperature sensor. | |
152 | */ | |
153 | regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN); | |
154 | regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP); | |
155 | ||
156 | wait = true; | |
157 | } | |
ca3de46b SG |
158 | |
159 | /* | |
160 | * According to the temp sensor designers, it may require up to ~17us | |
161 | * to complete a measurement. | |
162 | */ | |
37713a1e PZ |
163 | if (wait) |
164 | usleep_range(20, 50); | |
ca3de46b SG |
165 | |
166 | regmap_read(map, TEMPSENSE0, &val); | |
37713a1e PZ |
167 | |
168 | if (data->mode != THERMAL_DEVICE_ENABLED) { | |
169 | regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP); | |
170 | regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN); | |
171 | } | |
ca3de46b SG |
172 | |
173 | if ((val & TEMPSENSE0_FINISHED) == 0) { | |
174 | dev_dbg(&tz->device, "temp measurement never finished\n"); | |
175 | return -EAGAIN; | |
176 | } | |
177 | ||
178 | n_meas = (val & TEMPSENSE0_TEMP_CNT_MASK) >> TEMPSENSE0_TEMP_CNT_SHIFT; | |
179 | ||
180 | /* See imx_get_sensor_data() for formula derivation */ | |
749e8be7 | 181 | *temp = data->c2 - n_meas * data->c1; |
ca3de46b | 182 | |
3c94f17e AH |
183 | /* Update alarm value to next higher trip point for TEMPMON_IMX6Q */ |
184 | if (data->socdata->version == TEMPMON_IMX6Q) { | |
185 | if (data->alarm_temp == data->temp_passive && | |
186 | *temp >= data->temp_passive) | |
187 | imx_set_alarm_temp(data, data->temp_critical); | |
188 | if (data->alarm_temp == data->temp_critical && | |
189 | *temp < data->temp_passive) { | |
190 | imx_set_alarm_temp(data, data->temp_passive); | |
17e8351a | 191 | dev_dbg(&tz->device, "thermal alarm off: T < %d\n", |
3c94f17e AH |
192 | data->alarm_temp / 1000); |
193 | } | |
37713a1e PZ |
194 | } |
195 | ||
196 | if (*temp != data->last_temp) { | |
17e8351a | 197 | dev_dbg(&tz->device, "millicelsius: %d\n", *temp); |
37713a1e PZ |
198 | data->last_temp = *temp; |
199 | } | |
200 | ||
201 | /* Reenable alarm IRQ if temperature below alarm temperature */ | |
202 | if (!data->irq_enabled && *temp < data->alarm_temp) { | |
203 | data->irq_enabled = true; | |
204 | enable_irq(data->irq); | |
ca3de46b SG |
205 | } |
206 | ||
207 | return 0; | |
208 | } | |
209 | ||
210 | static int imx_get_mode(struct thermal_zone_device *tz, | |
211 | enum thermal_device_mode *mode) | |
212 | { | |
213 | struct imx_thermal_data *data = tz->devdata; | |
214 | ||
215 | *mode = data->mode; | |
216 | ||
217 | return 0; | |
218 | } | |
219 | ||
220 | static int imx_set_mode(struct thermal_zone_device *tz, | |
221 | enum thermal_device_mode mode) | |
222 | { | |
223 | struct imx_thermal_data *data = tz->devdata; | |
37713a1e | 224 | struct regmap *map = data->tempmon; |
ca3de46b SG |
225 | |
226 | if (mode == THERMAL_DEVICE_ENABLED) { | |
227 | tz->polling_delay = IMX_POLLING_DELAY; | |
228 | tz->passive_delay = IMX_PASSIVE_DELAY; | |
37713a1e PZ |
229 | |
230 | regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN); | |
231 | regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP); | |
232 | ||
233 | if (!data->irq_enabled) { | |
234 | data->irq_enabled = true; | |
235 | enable_irq(data->irq); | |
236 | } | |
ca3de46b | 237 | } else { |
37713a1e PZ |
238 | regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP); |
239 | regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN); | |
240 | ||
ca3de46b SG |
241 | tz->polling_delay = 0; |
242 | tz->passive_delay = 0; | |
37713a1e PZ |
243 | |
244 | if (data->irq_enabled) { | |
245 | disable_irq(data->irq); | |
246 | data->irq_enabled = false; | |
247 | } | |
ca3de46b SG |
248 | } |
249 | ||
250 | data->mode = mode; | |
0e70f466 | 251 | thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED); |
ca3de46b SG |
252 | |
253 | return 0; | |
254 | } | |
255 | ||
256 | static int imx_get_trip_type(struct thermal_zone_device *tz, int trip, | |
257 | enum thermal_trip_type *type) | |
258 | { | |
259 | *type = (trip == IMX_TRIP_PASSIVE) ? THERMAL_TRIP_PASSIVE : | |
260 | THERMAL_TRIP_CRITICAL; | |
261 | return 0; | |
262 | } | |
263 | ||
17e8351a | 264 | static int imx_get_crit_temp(struct thermal_zone_device *tz, int *temp) |
ca3de46b | 265 | { |
017e5142 PZ |
266 | struct imx_thermal_data *data = tz->devdata; |
267 | ||
268 | *temp = data->temp_critical; | |
ca3de46b SG |
269 | return 0; |
270 | } | |
271 | ||
272 | static int imx_get_trip_temp(struct thermal_zone_device *tz, int trip, | |
17e8351a | 273 | int *temp) |
ca3de46b | 274 | { |
017e5142 PZ |
275 | struct imx_thermal_data *data = tz->devdata; |
276 | ||
277 | *temp = (trip == IMX_TRIP_PASSIVE) ? data->temp_passive : | |
278 | data->temp_critical; | |
279 | return 0; | |
280 | } | |
281 | ||
282 | static int imx_set_trip_temp(struct thermal_zone_device *tz, int trip, | |
17e8351a | 283 | int temp) |
017e5142 PZ |
284 | { |
285 | struct imx_thermal_data *data = tz->devdata; | |
286 | ||
a2291bad | 287 | /* do not allow changing critical threshold */ |
017e5142 PZ |
288 | if (trip == IMX_TRIP_CRITICAL) |
289 | return -EPERM; | |
290 | ||
a2291bad TH |
291 | /* do not allow passive to be set higher than critical */ |
292 | if (temp < 0 || temp > data->temp_critical) | |
017e5142 PZ |
293 | return -EINVAL; |
294 | ||
295 | data->temp_passive = temp; | |
296 | ||
37713a1e PZ |
297 | imx_set_alarm_temp(data, temp); |
298 | ||
ca3de46b SG |
299 | return 0; |
300 | } | |
301 | ||
302 | static int imx_bind(struct thermal_zone_device *tz, | |
303 | struct thermal_cooling_device *cdev) | |
304 | { | |
305 | int ret; | |
306 | ||
307 | ret = thermal_zone_bind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev, | |
308 | THERMAL_NO_LIMIT, | |
6cd9e9f6 KS |
309 | THERMAL_NO_LIMIT, |
310 | THERMAL_WEIGHT_DEFAULT); | |
ca3de46b SG |
311 | if (ret) { |
312 | dev_err(&tz->device, | |
313 | "binding zone %s with cdev %s failed:%d\n", | |
314 | tz->type, cdev->type, ret); | |
315 | return ret; | |
316 | } | |
317 | ||
318 | return 0; | |
319 | } | |
320 | ||
321 | static int imx_unbind(struct thermal_zone_device *tz, | |
322 | struct thermal_cooling_device *cdev) | |
323 | { | |
324 | int ret; | |
325 | ||
326 | ret = thermal_zone_unbind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev); | |
327 | if (ret) { | |
328 | dev_err(&tz->device, | |
329 | "unbinding zone %s with cdev %s failed:%d\n", | |
330 | tz->type, cdev->type, ret); | |
331 | return ret; | |
332 | } | |
333 | ||
334 | return 0; | |
335 | } | |
336 | ||
cbb07bb3 | 337 | static struct thermal_zone_device_ops imx_tz_ops = { |
ca3de46b SG |
338 | .bind = imx_bind, |
339 | .unbind = imx_unbind, | |
340 | .get_temp = imx_get_temp, | |
341 | .get_mode = imx_get_mode, | |
342 | .set_mode = imx_set_mode, | |
343 | .get_trip_type = imx_get_trip_type, | |
344 | .get_trip_temp = imx_get_trip_temp, | |
345 | .get_crit_temp = imx_get_crit_temp, | |
017e5142 | 346 | .set_trip_temp = imx_set_trip_temp, |
ca3de46b SG |
347 | }; |
348 | ||
349 | static int imx_get_sensor_data(struct platform_device *pdev) | |
350 | { | |
351 | struct imx_thermal_data *data = platform_get_drvdata(pdev); | |
352 | struct regmap *map; | |
d0f9d64a | 353 | int t1, n1; |
ca3de46b SG |
354 | int ret; |
355 | u32 val; | |
749e8be7 | 356 | u64 temp64; |
ca3de46b SG |
357 | |
358 | map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, | |
359 | "fsl,tempmon-data"); | |
360 | if (IS_ERR(map)) { | |
361 | ret = PTR_ERR(map); | |
362 | dev_err(&pdev->dev, "failed to get sensor regmap: %d\n", ret); | |
363 | return ret; | |
364 | } | |
365 | ||
366 | ret = regmap_read(map, OCOTP_ANA1, &val); | |
367 | if (ret) { | |
368 | dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret); | |
369 | return ret; | |
370 | } | |
371 | ||
372 | if (val == 0 || val == ~0) { | |
373 | dev_err(&pdev->dev, "invalid sensor calibration data\n"); | |
374 | return -EINVAL; | |
375 | } | |
376 | ||
377 | /* | |
378 | * Sensor data layout: | |
379 | * [31:20] - sensor value @ 25C | |
749e8be7 AH |
380 | * Use universal formula now and only need sensor value @ 25C |
381 | * slope = 0.4297157 - (0.0015976 * 25C fuse) | |
ca3de46b SG |
382 | */ |
383 | n1 = val >> 20; | |
ca3de46b SG |
384 | t1 = 25; /* t1 always 25C */ |
385 | ||
386 | /* | |
749e8be7 AH |
387 | * Derived from linear interpolation: |
388 | * slope = 0.4297157 - (0.0015976 * 25C fuse) | |
389 | * slope = (FACTOR2 - FACTOR1 * n1) / FACTOR0 | |
390 | * (Nmeas - n1) / (Tmeas - t1) = slope | |
ca3de46b SG |
391 | * We want to reduce this down to the minimum computation necessary |
392 | * for each temperature read. Also, we want Tmeas in millicelsius | |
393 | * and we don't want to lose precision from integer division. So... | |
749e8be7 AH |
394 | * Tmeas = (Nmeas - n1) / slope + t1 |
395 | * milli_Tmeas = 1000 * (Nmeas - n1) / slope + 1000 * t1 | |
396 | * milli_Tmeas = -1000 * (n1 - Nmeas) / slope + 1000 * t1 | |
397 | * Let constant c1 = (-1000 / slope) | |
398 | * milli_Tmeas = (n1 - Nmeas) * c1 + 1000 * t1 | |
399 | * Let constant c2 = n1 *c1 + 1000 * t1 | |
400 | * milli_Tmeas = c2 - Nmeas * c1 | |
ca3de46b | 401 | */ |
749e8be7 AH |
402 | temp64 = FACTOR0; |
403 | temp64 *= 1000; | |
404 | do_div(temp64, FACTOR1 * n1 - FACTOR2); | |
405 | data->c1 = temp64; | |
406 | data->c2 = n1 * data->c1 + 1000 * t1; | |
ca3de46b | 407 | |
a2291bad TH |
408 | /* use OTP for thermal grade */ |
409 | ret = regmap_read(map, OCOTP_MEM0, &val); | |
410 | if (ret) { | |
411 | dev_err(&pdev->dev, "failed to read temp grade: %d\n", ret); | |
412 | return ret; | |
413 | } | |
414 | ||
415 | /* The maximum die temp is specified by the Temperature Grade */ | |
416 | switch ((val >> 6) & 0x3) { | |
417 | case 0: /* Commercial (0 to 95C) */ | |
418 | data->temp_grade = "Commercial"; | |
419 | data->temp_max = 95000; | |
420 | break; | |
421 | case 1: /* Extended Commercial (-20 to 105C) */ | |
422 | data->temp_grade = "Extended Commercial"; | |
423 | data->temp_max = 105000; | |
424 | break; | |
425 | case 2: /* Industrial (-40 to 105C) */ | |
426 | data->temp_grade = "Industrial"; | |
427 | data->temp_max = 105000; | |
428 | break; | |
429 | case 3: /* Automotive (-40 to 125C) */ | |
430 | data->temp_grade = "Automotive"; | |
431 | data->temp_max = 125000; | |
432 | break; | |
433 | } | |
017e5142 PZ |
434 | |
435 | /* | |
a2291bad TH |
436 | * Set the critical trip point at 5C under max |
437 | * Set the passive trip point at 10C under max (can change via sysfs) | |
017e5142 | 438 | */ |
a2291bad TH |
439 | data->temp_critical = data->temp_max - (1000 * 5); |
440 | data->temp_passive = data->temp_max - (1000 * 10); | |
017e5142 | 441 | |
ca3de46b SG |
442 | return 0; |
443 | } | |
444 | ||
37713a1e PZ |
445 | static irqreturn_t imx_thermal_alarm_irq(int irq, void *dev) |
446 | { | |
447 | struct imx_thermal_data *data = dev; | |
448 | ||
449 | disable_irq_nosync(irq); | |
450 | data->irq_enabled = false; | |
451 | ||
452 | return IRQ_WAKE_THREAD; | |
453 | } | |
454 | ||
455 | static irqreturn_t imx_thermal_alarm_irq_thread(int irq, void *dev) | |
456 | { | |
457 | struct imx_thermal_data *data = dev; | |
458 | ||
17e8351a | 459 | dev_dbg(&data->tz->device, "THERMAL ALARM: T > %d\n", |
37713a1e PZ |
460 | data->alarm_temp / 1000); |
461 | ||
0e70f466 | 462 | thermal_zone_device_update(data->tz, THERMAL_EVENT_UNSPECIFIED); |
37713a1e PZ |
463 | |
464 | return IRQ_HANDLED; | |
465 | } | |
466 | ||
3c94f17e AH |
467 | static const struct of_device_id of_imx_thermal_match[] = { |
468 | { .compatible = "fsl,imx6q-tempmon", .data = &thermal_imx6q_data, }, | |
469 | { .compatible = "fsl,imx6sx-tempmon", .data = &thermal_imx6sx_data, }, | |
470 | { /* end */ } | |
471 | }; | |
472 | MODULE_DEVICE_TABLE(of, of_imx_thermal_match); | |
473 | ||
ca3de46b SG |
474 | static int imx_thermal_probe(struct platform_device *pdev) |
475 | { | |
476 | struct imx_thermal_data *data; | |
ca3de46b | 477 | struct regmap *map; |
37713a1e | 478 | int measure_freq; |
ca3de46b SG |
479 | int ret; |
480 | ||
481 | data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); | |
482 | if (!data) | |
483 | return -ENOMEM; | |
484 | ||
485 | map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "fsl,tempmon"); | |
486 | if (IS_ERR(map)) { | |
487 | ret = PTR_ERR(map); | |
488 | dev_err(&pdev->dev, "failed to get tempmon regmap: %d\n", ret); | |
489 | return ret; | |
490 | } | |
491 | data->tempmon = map; | |
492 | ||
829bc78a | 493 | data->socdata = of_device_get_match_data(&pdev->dev); |
8b051ec3 SV |
494 | if (!data->socdata) { |
495 | dev_err(&pdev->dev, "no device match found\n"); | |
496 | return -ENODEV; | |
497 | } | |
3c94f17e AH |
498 | |
499 | /* make sure the IRQ flag is clear before enabling irq on i.MX6SX */ | |
500 | if (data->socdata->version == TEMPMON_IMX6SX) { | |
501 | regmap_write(map, MISC1 + REG_CLR, MISC1_IRQ_TEMPHIGH | | |
502 | MISC1_IRQ_TEMPLOW | MISC1_IRQ_TEMPPANIC); | |
503 | /* | |
504 | * reset value of LOW ALARM is incorrect, set it to lowest | |
505 | * value to avoid false trigger of low alarm. | |
506 | */ | |
507 | regmap_write(map, TEMPSENSE2 + REG_SET, | |
508 | TEMPSENSE2_LOW_VALUE_MASK); | |
509 | } | |
510 | ||
37713a1e PZ |
511 | data->irq = platform_get_irq(pdev, 0); |
512 | if (data->irq < 0) | |
513 | return data->irq; | |
514 | ||
ca3de46b SG |
515 | platform_set_drvdata(pdev, data); |
516 | ||
517 | ret = imx_get_sensor_data(pdev); | |
518 | if (ret) { | |
519 | dev_err(&pdev->dev, "failed to get sensor data\n"); | |
520 | return ret; | |
521 | } | |
522 | ||
523 | /* Make sure sensor is in known good state for measurements */ | |
524 | regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN); | |
525 | regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP); | |
526 | regmap_write(map, TEMPSENSE1 + REG_CLR, TEMPSENSE1_MEASURE_FREQ); | |
527 | regmap_write(map, MISC0 + REG_SET, MISC0_REFTOP_SELBIASOFF); | |
528 | regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN); | |
529 | ||
4d753aa7 VK |
530 | data->policy = cpufreq_cpu_get(0); |
531 | if (!data->policy) { | |
532 | pr_debug("%s: CPUFreq policy not found\n", __func__); | |
533 | return -EPROBE_DEFER; | |
534 | } | |
535 | ||
536 | data->cdev = cpufreq_cooling_register(data->policy); | |
ca3de46b SG |
537 | if (IS_ERR(data->cdev)) { |
538 | ret = PTR_ERR(data->cdev); | |
4d753aa7 VK |
539 | dev_err(&pdev->dev, |
540 | "failed to register cpufreq cooling device: %d\n", ret); | |
541 | cpufreq_cpu_put(data->policy); | |
ca3de46b SG |
542 | return ret; |
543 | } | |
544 | ||
90a21ff5 HK |
545 | data->thermal_clk = devm_clk_get(&pdev->dev, NULL); |
546 | if (IS_ERR(data->thermal_clk)) { | |
547 | ret = PTR_ERR(data->thermal_clk); | |
548 | if (ret != -EPROBE_DEFER) | |
549 | dev_err(&pdev->dev, | |
550 | "failed to get thermal clk: %d\n", ret); | |
551 | cpufreq_cooling_unregister(data->cdev); | |
4d753aa7 | 552 | cpufreq_cpu_put(data->policy); |
90a21ff5 HK |
553 | return ret; |
554 | } | |
555 | ||
556 | /* | |
557 | * Thermal sensor needs clk on to get correct value, normally | |
558 | * we should enable its clk before taking measurement and disable | |
559 | * clk after measurement is done, but if alarm function is enabled, | |
560 | * hardware will auto measure the temperature periodically, so we | |
561 | * need to keep the clk always on for alarm function. | |
562 | */ | |
563 | ret = clk_prepare_enable(data->thermal_clk); | |
564 | if (ret) { | |
565 | dev_err(&pdev->dev, "failed to enable thermal clk: %d\n", ret); | |
566 | cpufreq_cooling_unregister(data->cdev); | |
4d753aa7 | 567 | cpufreq_cpu_put(data->policy); |
90a21ff5 HK |
568 | return ret; |
569 | } | |
570 | ||
ca3de46b | 571 | data->tz = thermal_zone_device_register("imx_thermal_zone", |
017e5142 PZ |
572 | IMX_TRIP_NUM, |
573 | BIT(IMX_TRIP_PASSIVE), data, | |
ca3de46b SG |
574 | &imx_tz_ops, NULL, |
575 | IMX_PASSIVE_DELAY, | |
576 | IMX_POLLING_DELAY); | |
577 | if (IS_ERR(data->tz)) { | |
578 | ret = PTR_ERR(data->tz); | |
579 | dev_err(&pdev->dev, | |
580 | "failed to register thermal zone device %d\n", ret); | |
90a21ff5 | 581 | clk_disable_unprepare(data->thermal_clk); |
ca3de46b | 582 | cpufreq_cooling_unregister(data->cdev); |
4d753aa7 | 583 | cpufreq_cpu_put(data->policy); |
ca3de46b SG |
584 | return ret; |
585 | } | |
586 | ||
a2291bad TH |
587 | dev_info(&pdev->dev, "%s CPU temperature grade - max:%dC" |
588 | " critical:%dC passive:%dC\n", data->temp_grade, | |
589 | data->temp_max / 1000, data->temp_critical / 1000, | |
590 | data->temp_passive / 1000); | |
591 | ||
37713a1e PZ |
592 | /* Enable measurements at ~ 10 Hz */ |
593 | regmap_write(map, TEMPSENSE1 + REG_CLR, TEMPSENSE1_MEASURE_FREQ); | |
594 | measure_freq = DIV_ROUND_UP(32768, 10); /* 10 Hz */ | |
595 | regmap_write(map, TEMPSENSE1 + REG_SET, measure_freq); | |
596 | imx_set_alarm_temp(data, data->temp_passive); | |
3c94f17e AH |
597 | |
598 | if (data->socdata->version == TEMPMON_IMX6SX) | |
599 | imx_set_panic_temp(data, data->temp_critical); | |
600 | ||
37713a1e PZ |
601 | regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN); |
602 | regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP); | |
603 | ||
84866ee5 BP |
604 | ret = devm_request_threaded_irq(&pdev->dev, data->irq, |
605 | imx_thermal_alarm_irq, imx_thermal_alarm_irq_thread, | |
606 | 0, "imx_thermal", data); | |
607 | if (ret < 0) { | |
608 | dev_err(&pdev->dev, "failed to request alarm irq: %d\n", ret); | |
609 | clk_disable_unprepare(data->thermal_clk); | |
610 | thermal_zone_device_unregister(data->tz); | |
611 | cpufreq_cooling_unregister(data->cdev); | |
4d753aa7 | 612 | cpufreq_cpu_put(data->policy); |
84866ee5 BP |
613 | return ret; |
614 | } | |
615 | ||
37713a1e | 616 | data->irq_enabled = true; |
ca3de46b SG |
617 | data->mode = THERMAL_DEVICE_ENABLED; |
618 | ||
619 | return 0; | |
620 | } | |
621 | ||
622 | static int imx_thermal_remove(struct platform_device *pdev) | |
623 | { | |
624 | struct imx_thermal_data *data = platform_get_drvdata(pdev); | |
37713a1e PZ |
625 | struct regmap *map = data->tempmon; |
626 | ||
627 | /* Disable measurements */ | |
628 | regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN); | |
329fe7b1 AH |
629 | if (!IS_ERR(data->thermal_clk)) |
630 | clk_disable_unprepare(data->thermal_clk); | |
ca3de46b SG |
631 | |
632 | thermal_zone_device_unregister(data->tz); | |
633 | cpufreq_cooling_unregister(data->cdev); | |
4d753aa7 | 634 | cpufreq_cpu_put(data->policy); |
ca3de46b SG |
635 | |
636 | return 0; | |
637 | } | |
638 | ||
639 | #ifdef CONFIG_PM_SLEEP | |
640 | static int imx_thermal_suspend(struct device *dev) | |
641 | { | |
642 | struct imx_thermal_data *data = dev_get_drvdata(dev); | |
643 | struct regmap *map = data->tempmon; | |
ca3de46b | 644 | |
b46cce59 AH |
645 | /* |
646 | * Need to disable thermal sensor, otherwise, when thermal core | |
647 | * try to get temperature before thermal sensor resume, a wrong | |
648 | * temperature will be read as the thermal sensor is powered | |
649 | * down. | |
650 | */ | |
651 | regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP); | |
652 | regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN); | |
653 | data->mode = THERMAL_DEVICE_DISABLED; | |
d26eef8b | 654 | clk_disable_unprepare(data->thermal_clk); |
ca3de46b SG |
655 | |
656 | return 0; | |
657 | } | |
658 | ||
659 | static int imx_thermal_resume(struct device *dev) | |
660 | { | |
b46cce59 AH |
661 | struct imx_thermal_data *data = dev_get_drvdata(dev); |
662 | struct regmap *map = data->tempmon; | |
e3bdc8d7 | 663 | int ret; |
b46cce59 | 664 | |
e3bdc8d7 AY |
665 | ret = clk_prepare_enable(data->thermal_clk); |
666 | if (ret) | |
667 | return ret; | |
b46cce59 AH |
668 | /* Enabled thermal sensor after resume */ |
669 | regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN); | |
670 | regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP); | |
671 | data->mode = THERMAL_DEVICE_ENABLED; | |
672 | ||
ca3de46b SG |
673 | return 0; |
674 | } | |
675 | #endif | |
676 | ||
677 | static SIMPLE_DEV_PM_OPS(imx_thermal_pm_ops, | |
678 | imx_thermal_suspend, imx_thermal_resume); | |
679 | ||
ca3de46b SG |
680 | static struct platform_driver imx_thermal = { |
681 | .driver = { | |
682 | .name = "imx_thermal", | |
ca3de46b SG |
683 | .pm = &imx_thermal_pm_ops, |
684 | .of_match_table = of_imx_thermal_match, | |
685 | }, | |
686 | .probe = imx_thermal_probe, | |
687 | .remove = imx_thermal_remove, | |
688 | }; | |
689 | module_platform_driver(imx_thermal); | |
690 | ||
691 | MODULE_AUTHOR("Freescale Semiconductor, Inc."); | |
692 | MODULE_DESCRIPTION("Thermal driver for Freescale i.MX SoCs"); | |
693 | MODULE_LICENSE("GPL v2"); | |
694 | MODULE_ALIAS("platform:imx-thermal"); |