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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> | |
ae621557 | 28 | #include <linux/nvmem-consumer.h> |
ca3de46b SG |
29 | |
30 | #define REG_SET 0x4 | |
31 | #define REG_CLR 0x8 | |
32 | #define REG_TOG 0xc | |
33 | ||
34 | #define MISC0 0x0150 | |
35 | #define MISC0_REFTOP_SELBIASOFF (1 << 3) | |
3c94f17e AH |
36 | #define MISC1 0x0160 |
37 | #define MISC1_IRQ_TEMPHIGH (1 << 29) | |
38 | /* Below LOW and PANIC bits are only for TEMPMON_IMX6SX */ | |
39 | #define MISC1_IRQ_TEMPLOW (1 << 28) | |
40 | #define MISC1_IRQ_TEMPPANIC (1 << 27) | |
ca3de46b SG |
41 | |
42 | #define TEMPSENSE0 0x0180 | |
37713a1e PZ |
43 | #define TEMPSENSE0_ALARM_VALUE_SHIFT 20 |
44 | #define TEMPSENSE0_ALARM_VALUE_MASK (0xfff << TEMPSENSE0_ALARM_VALUE_SHIFT) | |
ca3de46b SG |
45 | #define TEMPSENSE0_TEMP_CNT_SHIFT 8 |
46 | #define TEMPSENSE0_TEMP_CNT_MASK (0xfff << TEMPSENSE0_TEMP_CNT_SHIFT) | |
47 | #define TEMPSENSE0_FINISHED (1 << 2) | |
48 | #define TEMPSENSE0_MEASURE_TEMP (1 << 1) | |
49 | #define TEMPSENSE0_POWER_DOWN (1 << 0) | |
50 | ||
51 | #define TEMPSENSE1 0x0190 | |
52 | #define TEMPSENSE1_MEASURE_FREQ 0xffff | |
3c94f17e AH |
53 | /* Below TEMPSENSE2 is only for TEMPMON_IMX6SX */ |
54 | #define TEMPSENSE2 0x0290 | |
55 | #define TEMPSENSE2_LOW_VALUE_SHIFT 0 | |
56 | #define TEMPSENSE2_LOW_VALUE_MASK 0xfff | |
57 | #define TEMPSENSE2_PANIC_VALUE_SHIFT 16 | |
58 | #define TEMPSENSE2_PANIC_VALUE_MASK 0xfff0000 | |
ca3de46b | 59 | |
a2291bad | 60 | #define OCOTP_MEM0 0x0480 |
ca3de46b SG |
61 | #define OCOTP_ANA1 0x04e0 |
62 | ||
63 | /* The driver supports 1 passive trip point and 1 critical trip point */ | |
64 | enum imx_thermal_trip { | |
65 | IMX_TRIP_PASSIVE, | |
66 | IMX_TRIP_CRITICAL, | |
67 | IMX_TRIP_NUM, | |
68 | }; | |
69 | ||
ca3de46b SG |
70 | #define IMX_POLLING_DELAY 2000 /* millisecond */ |
71 | #define IMX_PASSIVE_DELAY 1000 | |
72 | ||
749e8be7 AH |
73 | #define FACTOR0 10000000 |
74 | #define FACTOR1 15976 | |
75 | #define FACTOR2 4297157 | |
76 | ||
3c94f17e AH |
77 | #define TEMPMON_IMX6Q 1 |
78 | #define TEMPMON_IMX6SX 2 | |
79 | ||
80 | struct thermal_soc_data { | |
81 | u32 version; | |
82 | }; | |
83 | ||
84 | static struct thermal_soc_data thermal_imx6q_data = { | |
85 | .version = TEMPMON_IMX6Q, | |
86 | }; | |
87 | ||
88 | static struct thermal_soc_data thermal_imx6sx_data = { | |
89 | .version = TEMPMON_IMX6SX, | |
90 | }; | |
91 | ||
ca3de46b | 92 | struct imx_thermal_data { |
4d753aa7 | 93 | struct cpufreq_policy *policy; |
ca3de46b SG |
94 | struct thermal_zone_device *tz; |
95 | struct thermal_cooling_device *cdev; | |
96 | enum thermal_device_mode mode; | |
97 | struct regmap *tempmon; | |
ae621557 | 98 | u32 c1, c2; /* See formula in imx_init_calib() */ |
17e8351a SH |
99 | int temp_passive; |
100 | int temp_critical; | |
a2291bad | 101 | int temp_max; |
17e8351a SH |
102 | int alarm_temp; |
103 | int last_temp; | |
37713a1e PZ |
104 | bool irq_enabled; |
105 | int irq; | |
329fe7b1 | 106 | struct clk *thermal_clk; |
3c94f17e | 107 | const struct thermal_soc_data *socdata; |
a2291bad | 108 | const char *temp_grade; |
ca3de46b SG |
109 | }; |
110 | ||
3c94f17e | 111 | static void imx_set_panic_temp(struct imx_thermal_data *data, |
17e8351a | 112 | int panic_temp) |
3c94f17e AH |
113 | { |
114 | struct regmap *map = data->tempmon; | |
115 | int critical_value; | |
116 | ||
117 | critical_value = (data->c2 - panic_temp) / data->c1; | |
118 | regmap_write(map, TEMPSENSE2 + REG_CLR, TEMPSENSE2_PANIC_VALUE_MASK); | |
119 | regmap_write(map, TEMPSENSE2 + REG_SET, critical_value << | |
120 | TEMPSENSE2_PANIC_VALUE_SHIFT); | |
121 | } | |
122 | ||
37713a1e | 123 | static void imx_set_alarm_temp(struct imx_thermal_data *data, |
17e8351a | 124 | int alarm_temp) |
37713a1e PZ |
125 | { |
126 | struct regmap *map = data->tempmon; | |
127 | int alarm_value; | |
128 | ||
129 | data->alarm_temp = alarm_temp; | |
749e8be7 | 130 | alarm_value = (data->c2 - alarm_temp) / data->c1; |
37713a1e PZ |
131 | regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_ALARM_VALUE_MASK); |
132 | regmap_write(map, TEMPSENSE0 + REG_SET, alarm_value << | |
133 | TEMPSENSE0_ALARM_VALUE_SHIFT); | |
134 | } | |
135 | ||
17e8351a | 136 | static int imx_get_temp(struct thermal_zone_device *tz, int *temp) |
ca3de46b SG |
137 | { |
138 | struct imx_thermal_data *data = tz->devdata; | |
139 | struct regmap *map = data->tempmon; | |
ca3de46b | 140 | unsigned int n_meas; |
37713a1e | 141 | bool wait; |
ca3de46b SG |
142 | u32 val; |
143 | ||
37713a1e PZ |
144 | if (data->mode == THERMAL_DEVICE_ENABLED) { |
145 | /* Check if a measurement is currently in progress */ | |
146 | regmap_read(map, TEMPSENSE0, &val); | |
147 | wait = !(val & TEMPSENSE0_FINISHED); | |
148 | } else { | |
149 | /* | |
150 | * Every time we measure the temperature, we will power on the | |
151 | * temperature sensor, enable measurements, take a reading, | |
152 | * disable measurements, power off the temperature sensor. | |
153 | */ | |
154 | regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN); | |
155 | regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP); | |
156 | ||
157 | wait = true; | |
158 | } | |
ca3de46b SG |
159 | |
160 | /* | |
161 | * According to the temp sensor designers, it may require up to ~17us | |
162 | * to complete a measurement. | |
163 | */ | |
37713a1e PZ |
164 | if (wait) |
165 | usleep_range(20, 50); | |
ca3de46b SG |
166 | |
167 | regmap_read(map, TEMPSENSE0, &val); | |
37713a1e PZ |
168 | |
169 | if (data->mode != THERMAL_DEVICE_ENABLED) { | |
170 | regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP); | |
171 | regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN); | |
172 | } | |
ca3de46b SG |
173 | |
174 | if ((val & TEMPSENSE0_FINISHED) == 0) { | |
175 | dev_dbg(&tz->device, "temp measurement never finished\n"); | |
176 | return -EAGAIN; | |
177 | } | |
178 | ||
179 | n_meas = (val & TEMPSENSE0_TEMP_CNT_MASK) >> TEMPSENSE0_TEMP_CNT_SHIFT; | |
180 | ||
ae621557 | 181 | /* See imx_init_calib() for formula derivation */ |
749e8be7 | 182 | *temp = data->c2 - n_meas * data->c1; |
ca3de46b | 183 | |
3c94f17e AH |
184 | /* Update alarm value to next higher trip point for TEMPMON_IMX6Q */ |
185 | if (data->socdata->version == TEMPMON_IMX6Q) { | |
186 | if (data->alarm_temp == data->temp_passive && | |
187 | *temp >= data->temp_passive) | |
188 | imx_set_alarm_temp(data, data->temp_critical); | |
189 | if (data->alarm_temp == data->temp_critical && | |
190 | *temp < data->temp_passive) { | |
191 | imx_set_alarm_temp(data, data->temp_passive); | |
17e8351a | 192 | dev_dbg(&tz->device, "thermal alarm off: T < %d\n", |
3c94f17e AH |
193 | data->alarm_temp / 1000); |
194 | } | |
37713a1e PZ |
195 | } |
196 | ||
197 | if (*temp != data->last_temp) { | |
17e8351a | 198 | dev_dbg(&tz->device, "millicelsius: %d\n", *temp); |
37713a1e PZ |
199 | data->last_temp = *temp; |
200 | } | |
201 | ||
202 | /* Reenable alarm IRQ if temperature below alarm temperature */ | |
203 | if (!data->irq_enabled && *temp < data->alarm_temp) { | |
204 | data->irq_enabled = true; | |
205 | enable_irq(data->irq); | |
ca3de46b SG |
206 | } |
207 | ||
208 | return 0; | |
209 | } | |
210 | ||
211 | static int imx_get_mode(struct thermal_zone_device *tz, | |
212 | enum thermal_device_mode *mode) | |
213 | { | |
214 | struct imx_thermal_data *data = tz->devdata; | |
215 | ||
216 | *mode = data->mode; | |
217 | ||
218 | return 0; | |
219 | } | |
220 | ||
221 | static int imx_set_mode(struct thermal_zone_device *tz, | |
222 | enum thermal_device_mode mode) | |
223 | { | |
224 | struct imx_thermal_data *data = tz->devdata; | |
37713a1e | 225 | struct regmap *map = data->tempmon; |
ca3de46b SG |
226 | |
227 | if (mode == THERMAL_DEVICE_ENABLED) { | |
228 | tz->polling_delay = IMX_POLLING_DELAY; | |
229 | tz->passive_delay = IMX_PASSIVE_DELAY; | |
37713a1e PZ |
230 | |
231 | regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN); | |
232 | regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP); | |
233 | ||
234 | if (!data->irq_enabled) { | |
235 | data->irq_enabled = true; | |
236 | enable_irq(data->irq); | |
237 | } | |
ca3de46b | 238 | } else { |
37713a1e PZ |
239 | regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP); |
240 | regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN); | |
241 | ||
ca3de46b SG |
242 | tz->polling_delay = 0; |
243 | tz->passive_delay = 0; | |
37713a1e PZ |
244 | |
245 | if (data->irq_enabled) { | |
246 | disable_irq(data->irq); | |
247 | data->irq_enabled = false; | |
248 | } | |
ca3de46b SG |
249 | } |
250 | ||
251 | data->mode = mode; | |
0e70f466 | 252 | thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED); |
ca3de46b SG |
253 | |
254 | return 0; | |
255 | } | |
256 | ||
257 | static int imx_get_trip_type(struct thermal_zone_device *tz, int trip, | |
258 | enum thermal_trip_type *type) | |
259 | { | |
260 | *type = (trip == IMX_TRIP_PASSIVE) ? THERMAL_TRIP_PASSIVE : | |
261 | THERMAL_TRIP_CRITICAL; | |
262 | return 0; | |
263 | } | |
264 | ||
17e8351a | 265 | static int imx_get_crit_temp(struct thermal_zone_device *tz, int *temp) |
ca3de46b | 266 | { |
017e5142 PZ |
267 | struct imx_thermal_data *data = tz->devdata; |
268 | ||
269 | *temp = data->temp_critical; | |
ca3de46b SG |
270 | return 0; |
271 | } | |
272 | ||
273 | static int imx_get_trip_temp(struct thermal_zone_device *tz, int trip, | |
17e8351a | 274 | int *temp) |
ca3de46b | 275 | { |
017e5142 PZ |
276 | struct imx_thermal_data *data = tz->devdata; |
277 | ||
278 | *temp = (trip == IMX_TRIP_PASSIVE) ? data->temp_passive : | |
279 | data->temp_critical; | |
280 | return 0; | |
281 | } | |
282 | ||
283 | static int imx_set_trip_temp(struct thermal_zone_device *tz, int trip, | |
17e8351a | 284 | int temp) |
017e5142 PZ |
285 | { |
286 | struct imx_thermal_data *data = tz->devdata; | |
287 | ||
a2291bad | 288 | /* do not allow changing critical threshold */ |
017e5142 PZ |
289 | if (trip == IMX_TRIP_CRITICAL) |
290 | return -EPERM; | |
291 | ||
a2291bad TH |
292 | /* do not allow passive to be set higher than critical */ |
293 | if (temp < 0 || temp > data->temp_critical) | |
017e5142 PZ |
294 | return -EINVAL; |
295 | ||
296 | data->temp_passive = temp; | |
297 | ||
37713a1e PZ |
298 | imx_set_alarm_temp(data, temp); |
299 | ||
ca3de46b SG |
300 | return 0; |
301 | } | |
302 | ||
303 | static int imx_bind(struct thermal_zone_device *tz, | |
304 | struct thermal_cooling_device *cdev) | |
305 | { | |
306 | int ret; | |
307 | ||
308 | ret = thermal_zone_bind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev, | |
309 | THERMAL_NO_LIMIT, | |
6cd9e9f6 KS |
310 | THERMAL_NO_LIMIT, |
311 | THERMAL_WEIGHT_DEFAULT); | |
ca3de46b SG |
312 | if (ret) { |
313 | dev_err(&tz->device, | |
314 | "binding zone %s with cdev %s failed:%d\n", | |
315 | tz->type, cdev->type, ret); | |
316 | return ret; | |
317 | } | |
318 | ||
319 | return 0; | |
320 | } | |
321 | ||
322 | static int imx_unbind(struct thermal_zone_device *tz, | |
323 | struct thermal_cooling_device *cdev) | |
324 | { | |
325 | int ret; | |
326 | ||
327 | ret = thermal_zone_unbind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev); | |
328 | if (ret) { | |
329 | dev_err(&tz->device, | |
330 | "unbinding zone %s with cdev %s failed:%d\n", | |
331 | tz->type, cdev->type, ret); | |
332 | return ret; | |
333 | } | |
334 | ||
335 | return 0; | |
336 | } | |
337 | ||
cbb07bb3 | 338 | static struct thermal_zone_device_ops imx_tz_ops = { |
ca3de46b SG |
339 | .bind = imx_bind, |
340 | .unbind = imx_unbind, | |
341 | .get_temp = imx_get_temp, | |
342 | .get_mode = imx_get_mode, | |
343 | .set_mode = imx_set_mode, | |
344 | .get_trip_type = imx_get_trip_type, | |
345 | .get_trip_temp = imx_get_trip_temp, | |
346 | .get_crit_temp = imx_get_crit_temp, | |
017e5142 | 347 | .set_trip_temp = imx_set_trip_temp, |
ca3de46b SG |
348 | }; |
349 | ||
ae621557 | 350 | static int imx_init_calib(struct platform_device *pdev, u32 val) |
ca3de46b SG |
351 | { |
352 | struct imx_thermal_data *data = platform_get_drvdata(pdev); | |
d0f9d64a | 353 | int t1, n1; |
749e8be7 | 354 | u64 temp64; |
ca3de46b | 355 | |
ca3de46b SG |
356 | if (val == 0 || val == ~0) { |
357 | dev_err(&pdev->dev, "invalid sensor calibration data\n"); | |
358 | return -EINVAL; | |
359 | } | |
360 | ||
361 | /* | |
362 | * Sensor data layout: | |
363 | * [31:20] - sensor value @ 25C | |
749e8be7 AH |
364 | * Use universal formula now and only need sensor value @ 25C |
365 | * slope = 0.4297157 - (0.0015976 * 25C fuse) | |
ca3de46b SG |
366 | */ |
367 | n1 = val >> 20; | |
ca3de46b SG |
368 | t1 = 25; /* t1 always 25C */ |
369 | ||
370 | /* | |
749e8be7 AH |
371 | * Derived from linear interpolation: |
372 | * slope = 0.4297157 - (0.0015976 * 25C fuse) | |
373 | * slope = (FACTOR2 - FACTOR1 * n1) / FACTOR0 | |
374 | * (Nmeas - n1) / (Tmeas - t1) = slope | |
ca3de46b SG |
375 | * We want to reduce this down to the minimum computation necessary |
376 | * for each temperature read. Also, we want Tmeas in millicelsius | |
377 | * and we don't want to lose precision from integer division. So... | |
749e8be7 AH |
378 | * Tmeas = (Nmeas - n1) / slope + t1 |
379 | * milli_Tmeas = 1000 * (Nmeas - n1) / slope + 1000 * t1 | |
380 | * milli_Tmeas = -1000 * (n1 - Nmeas) / slope + 1000 * t1 | |
381 | * Let constant c1 = (-1000 / slope) | |
382 | * milli_Tmeas = (n1 - Nmeas) * c1 + 1000 * t1 | |
383 | * Let constant c2 = n1 *c1 + 1000 * t1 | |
384 | * milli_Tmeas = c2 - Nmeas * c1 | |
ca3de46b | 385 | */ |
749e8be7 AH |
386 | temp64 = FACTOR0; |
387 | temp64 *= 1000; | |
388 | do_div(temp64, FACTOR1 * n1 - FACTOR2); | |
389 | data->c1 = temp64; | |
390 | data->c2 = n1 * data->c1 + 1000 * t1; | |
ca3de46b | 391 | |
ae621557 LC |
392 | return 0; |
393 | } | |
394 | ||
395 | static void imx_init_temp_grade(struct platform_device *pdev, u32 val) | |
396 | { | |
397 | struct imx_thermal_data *data = platform_get_drvdata(pdev); | |
a2291bad TH |
398 | |
399 | /* The maximum die temp is specified by the Temperature Grade */ | |
400 | switch ((val >> 6) & 0x3) { | |
401 | case 0: /* Commercial (0 to 95C) */ | |
402 | data->temp_grade = "Commercial"; | |
403 | data->temp_max = 95000; | |
404 | break; | |
405 | case 1: /* Extended Commercial (-20 to 105C) */ | |
406 | data->temp_grade = "Extended Commercial"; | |
407 | data->temp_max = 105000; | |
408 | break; | |
409 | case 2: /* Industrial (-40 to 105C) */ | |
410 | data->temp_grade = "Industrial"; | |
411 | data->temp_max = 105000; | |
412 | break; | |
413 | case 3: /* Automotive (-40 to 125C) */ | |
414 | data->temp_grade = "Automotive"; | |
415 | data->temp_max = 125000; | |
416 | break; | |
417 | } | |
017e5142 PZ |
418 | |
419 | /* | |
a2291bad TH |
420 | * Set the critical trip point at 5C under max |
421 | * Set the passive trip point at 10C under max (can change via sysfs) | |
017e5142 | 422 | */ |
a2291bad TH |
423 | data->temp_critical = data->temp_max - (1000 * 5); |
424 | data->temp_passive = data->temp_max - (1000 * 10); | |
ae621557 LC |
425 | } |
426 | ||
427 | static int imx_init_from_tempmon_data(struct platform_device *pdev) | |
428 | { | |
429 | struct regmap *map; | |
430 | int ret; | |
431 | u32 val; | |
432 | ||
433 | map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, | |
434 | "fsl,tempmon-data"); | |
435 | if (IS_ERR(map)) { | |
436 | ret = PTR_ERR(map); | |
437 | dev_err(&pdev->dev, "failed to get sensor regmap: %d\n", ret); | |
438 | return ret; | |
439 | } | |
440 | ||
441 | ret = regmap_read(map, OCOTP_ANA1, &val); | |
442 | if (ret) { | |
443 | dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret); | |
444 | return ret; | |
445 | } | |
446 | ret = imx_init_calib(pdev, val); | |
447 | if (ret) | |
448 | return ret; | |
449 | ||
450 | ret = regmap_read(map, OCOTP_MEM0, &val); | |
451 | if (ret) { | |
452 | dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret); | |
453 | return ret; | |
454 | } | |
455 | imx_init_temp_grade(pdev, val); | |
456 | ||
457 | return 0; | |
458 | } | |
459 | ||
460 | static int imx_init_from_nvmem_cells(struct platform_device *pdev) | |
461 | { | |
462 | int ret; | |
463 | u32 val; | |
464 | ||
465 | ret = nvmem_cell_read_u32(&pdev->dev, "calib", &val); | |
466 | if (ret) | |
467 | return ret; | |
468 | imx_init_calib(pdev, val); | |
469 | ||
470 | ret = nvmem_cell_read_u32(&pdev->dev, "temp_grade", &val); | |
471 | if (ret) | |
472 | return ret; | |
473 | imx_init_temp_grade(pdev, val); | |
017e5142 | 474 | |
ca3de46b SG |
475 | return 0; |
476 | } | |
477 | ||
37713a1e PZ |
478 | static irqreturn_t imx_thermal_alarm_irq(int irq, void *dev) |
479 | { | |
480 | struct imx_thermal_data *data = dev; | |
481 | ||
482 | disable_irq_nosync(irq); | |
483 | data->irq_enabled = false; | |
484 | ||
485 | return IRQ_WAKE_THREAD; | |
486 | } | |
487 | ||
488 | static irqreturn_t imx_thermal_alarm_irq_thread(int irq, void *dev) | |
489 | { | |
490 | struct imx_thermal_data *data = dev; | |
491 | ||
17e8351a | 492 | dev_dbg(&data->tz->device, "THERMAL ALARM: T > %d\n", |
37713a1e PZ |
493 | data->alarm_temp / 1000); |
494 | ||
0e70f466 | 495 | thermal_zone_device_update(data->tz, THERMAL_EVENT_UNSPECIFIED); |
37713a1e PZ |
496 | |
497 | return IRQ_HANDLED; | |
498 | } | |
499 | ||
3c94f17e AH |
500 | static const struct of_device_id of_imx_thermal_match[] = { |
501 | { .compatible = "fsl,imx6q-tempmon", .data = &thermal_imx6q_data, }, | |
502 | { .compatible = "fsl,imx6sx-tempmon", .data = &thermal_imx6sx_data, }, | |
503 | { /* end */ } | |
504 | }; | |
505 | MODULE_DEVICE_TABLE(of, of_imx_thermal_match); | |
506 | ||
ca3de46b SG |
507 | static int imx_thermal_probe(struct platform_device *pdev) |
508 | { | |
509 | struct imx_thermal_data *data; | |
ca3de46b | 510 | struct regmap *map; |
37713a1e | 511 | int measure_freq; |
ca3de46b SG |
512 | int ret; |
513 | ||
514 | data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); | |
515 | if (!data) | |
516 | return -ENOMEM; | |
517 | ||
518 | map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "fsl,tempmon"); | |
519 | if (IS_ERR(map)) { | |
520 | ret = PTR_ERR(map); | |
521 | dev_err(&pdev->dev, "failed to get tempmon regmap: %d\n", ret); | |
522 | return ret; | |
523 | } | |
524 | data->tempmon = map; | |
525 | ||
829bc78a | 526 | data->socdata = of_device_get_match_data(&pdev->dev); |
8b051ec3 SV |
527 | if (!data->socdata) { |
528 | dev_err(&pdev->dev, "no device match found\n"); | |
529 | return -ENODEV; | |
530 | } | |
3c94f17e AH |
531 | |
532 | /* make sure the IRQ flag is clear before enabling irq on i.MX6SX */ | |
533 | if (data->socdata->version == TEMPMON_IMX6SX) { | |
534 | regmap_write(map, MISC1 + REG_CLR, MISC1_IRQ_TEMPHIGH | | |
535 | MISC1_IRQ_TEMPLOW | MISC1_IRQ_TEMPPANIC); | |
536 | /* | |
537 | * reset value of LOW ALARM is incorrect, set it to lowest | |
538 | * value to avoid false trigger of low alarm. | |
539 | */ | |
540 | regmap_write(map, TEMPSENSE2 + REG_SET, | |
541 | TEMPSENSE2_LOW_VALUE_MASK); | |
542 | } | |
543 | ||
37713a1e PZ |
544 | data->irq = platform_get_irq(pdev, 0); |
545 | if (data->irq < 0) | |
546 | return data->irq; | |
547 | ||
ca3de46b SG |
548 | platform_set_drvdata(pdev, data); |
549 | ||
ae621557 LC |
550 | if (of_find_property(pdev->dev.of_node, "nvmem-cells", NULL)) { |
551 | ret = imx_init_from_nvmem_cells(pdev); | |
552 | if (ret == -EPROBE_DEFER) | |
553 | return ret; | |
554 | if (ret) { | |
555 | dev_err(&pdev->dev, "failed to init from nvmem: %d\n", | |
556 | ret); | |
557 | return ret; | |
558 | } | |
559 | } else { | |
560 | ret = imx_init_from_tempmon_data(pdev); | |
561 | if (ret) { | |
562 | dev_err(&pdev->dev, "failed to init from from fsl,tempmon-data\n"); | |
563 | return ret; | |
564 | } | |
ca3de46b SG |
565 | } |
566 | ||
567 | /* Make sure sensor is in known good state for measurements */ | |
568 | regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN); | |
569 | regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP); | |
570 | regmap_write(map, TEMPSENSE1 + REG_CLR, TEMPSENSE1_MEASURE_FREQ); | |
571 | regmap_write(map, MISC0 + REG_SET, MISC0_REFTOP_SELBIASOFF); | |
572 | regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN); | |
573 | ||
4d753aa7 VK |
574 | data->policy = cpufreq_cpu_get(0); |
575 | if (!data->policy) { | |
576 | pr_debug("%s: CPUFreq policy not found\n", __func__); | |
577 | return -EPROBE_DEFER; | |
578 | } | |
579 | ||
580 | data->cdev = cpufreq_cooling_register(data->policy); | |
ca3de46b SG |
581 | if (IS_ERR(data->cdev)) { |
582 | ret = PTR_ERR(data->cdev); | |
4d753aa7 VK |
583 | dev_err(&pdev->dev, |
584 | "failed to register cpufreq cooling device: %d\n", ret); | |
585 | cpufreq_cpu_put(data->policy); | |
ca3de46b SG |
586 | return ret; |
587 | } | |
588 | ||
90a21ff5 HK |
589 | data->thermal_clk = devm_clk_get(&pdev->dev, NULL); |
590 | if (IS_ERR(data->thermal_clk)) { | |
591 | ret = PTR_ERR(data->thermal_clk); | |
592 | if (ret != -EPROBE_DEFER) | |
593 | dev_err(&pdev->dev, | |
594 | "failed to get thermal clk: %d\n", ret); | |
595 | cpufreq_cooling_unregister(data->cdev); | |
4d753aa7 | 596 | cpufreq_cpu_put(data->policy); |
90a21ff5 HK |
597 | return ret; |
598 | } | |
599 | ||
600 | /* | |
601 | * Thermal sensor needs clk on to get correct value, normally | |
602 | * we should enable its clk before taking measurement and disable | |
603 | * clk after measurement is done, but if alarm function is enabled, | |
604 | * hardware will auto measure the temperature periodically, so we | |
605 | * need to keep the clk always on for alarm function. | |
606 | */ | |
607 | ret = clk_prepare_enable(data->thermal_clk); | |
608 | if (ret) { | |
609 | dev_err(&pdev->dev, "failed to enable thermal clk: %d\n", ret); | |
610 | cpufreq_cooling_unregister(data->cdev); | |
4d753aa7 | 611 | cpufreq_cpu_put(data->policy); |
90a21ff5 HK |
612 | return ret; |
613 | } | |
614 | ||
ca3de46b | 615 | data->tz = thermal_zone_device_register("imx_thermal_zone", |
017e5142 PZ |
616 | IMX_TRIP_NUM, |
617 | BIT(IMX_TRIP_PASSIVE), data, | |
ca3de46b SG |
618 | &imx_tz_ops, NULL, |
619 | IMX_PASSIVE_DELAY, | |
620 | IMX_POLLING_DELAY); | |
621 | if (IS_ERR(data->tz)) { | |
622 | ret = PTR_ERR(data->tz); | |
623 | dev_err(&pdev->dev, | |
624 | "failed to register thermal zone device %d\n", ret); | |
90a21ff5 | 625 | clk_disable_unprepare(data->thermal_clk); |
ca3de46b | 626 | cpufreq_cooling_unregister(data->cdev); |
4d753aa7 | 627 | cpufreq_cpu_put(data->policy); |
ca3de46b SG |
628 | return ret; |
629 | } | |
630 | ||
a2291bad TH |
631 | dev_info(&pdev->dev, "%s CPU temperature grade - max:%dC" |
632 | " critical:%dC passive:%dC\n", data->temp_grade, | |
633 | data->temp_max / 1000, data->temp_critical / 1000, | |
634 | data->temp_passive / 1000); | |
635 | ||
37713a1e PZ |
636 | /* Enable measurements at ~ 10 Hz */ |
637 | regmap_write(map, TEMPSENSE1 + REG_CLR, TEMPSENSE1_MEASURE_FREQ); | |
638 | measure_freq = DIV_ROUND_UP(32768, 10); /* 10 Hz */ | |
639 | regmap_write(map, TEMPSENSE1 + REG_SET, measure_freq); | |
640 | imx_set_alarm_temp(data, data->temp_passive); | |
3c94f17e AH |
641 | |
642 | if (data->socdata->version == TEMPMON_IMX6SX) | |
643 | imx_set_panic_temp(data, data->temp_critical); | |
644 | ||
37713a1e PZ |
645 | regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN); |
646 | regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP); | |
647 | ||
84866ee5 BP |
648 | ret = devm_request_threaded_irq(&pdev->dev, data->irq, |
649 | imx_thermal_alarm_irq, imx_thermal_alarm_irq_thread, | |
650 | 0, "imx_thermal", data); | |
651 | if (ret < 0) { | |
652 | dev_err(&pdev->dev, "failed to request alarm irq: %d\n", ret); | |
653 | clk_disable_unprepare(data->thermal_clk); | |
654 | thermal_zone_device_unregister(data->tz); | |
655 | cpufreq_cooling_unregister(data->cdev); | |
4d753aa7 | 656 | cpufreq_cpu_put(data->policy); |
84866ee5 BP |
657 | return ret; |
658 | } | |
659 | ||
37713a1e | 660 | data->irq_enabled = true; |
ca3de46b SG |
661 | data->mode = THERMAL_DEVICE_ENABLED; |
662 | ||
663 | return 0; | |
664 | } | |
665 | ||
666 | static int imx_thermal_remove(struct platform_device *pdev) | |
667 | { | |
668 | struct imx_thermal_data *data = platform_get_drvdata(pdev); | |
37713a1e PZ |
669 | struct regmap *map = data->tempmon; |
670 | ||
671 | /* Disable measurements */ | |
672 | regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN); | |
329fe7b1 AH |
673 | if (!IS_ERR(data->thermal_clk)) |
674 | clk_disable_unprepare(data->thermal_clk); | |
ca3de46b SG |
675 | |
676 | thermal_zone_device_unregister(data->tz); | |
677 | cpufreq_cooling_unregister(data->cdev); | |
4d753aa7 | 678 | cpufreq_cpu_put(data->policy); |
ca3de46b SG |
679 | |
680 | return 0; | |
681 | } | |
682 | ||
683 | #ifdef CONFIG_PM_SLEEP | |
684 | static int imx_thermal_suspend(struct device *dev) | |
685 | { | |
686 | struct imx_thermal_data *data = dev_get_drvdata(dev); | |
687 | struct regmap *map = data->tempmon; | |
ca3de46b | 688 | |
b46cce59 AH |
689 | /* |
690 | * Need to disable thermal sensor, otherwise, when thermal core | |
691 | * try to get temperature before thermal sensor resume, a wrong | |
692 | * temperature will be read as the thermal sensor is powered | |
693 | * down. | |
694 | */ | |
695 | regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP); | |
696 | regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN); | |
697 | data->mode = THERMAL_DEVICE_DISABLED; | |
d26eef8b | 698 | clk_disable_unprepare(data->thermal_clk); |
ca3de46b SG |
699 | |
700 | return 0; | |
701 | } | |
702 | ||
703 | static int imx_thermal_resume(struct device *dev) | |
704 | { | |
b46cce59 AH |
705 | struct imx_thermal_data *data = dev_get_drvdata(dev); |
706 | struct regmap *map = data->tempmon; | |
e3bdc8d7 | 707 | int ret; |
b46cce59 | 708 | |
e3bdc8d7 AY |
709 | ret = clk_prepare_enable(data->thermal_clk); |
710 | if (ret) | |
711 | return ret; | |
b46cce59 AH |
712 | /* Enabled thermal sensor after resume */ |
713 | regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN); | |
714 | regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP); | |
715 | data->mode = THERMAL_DEVICE_ENABLED; | |
716 | ||
ca3de46b SG |
717 | return 0; |
718 | } | |
719 | #endif | |
720 | ||
721 | static SIMPLE_DEV_PM_OPS(imx_thermal_pm_ops, | |
722 | imx_thermal_suspend, imx_thermal_resume); | |
723 | ||
ca3de46b SG |
724 | static struct platform_driver imx_thermal = { |
725 | .driver = { | |
726 | .name = "imx_thermal", | |
ca3de46b SG |
727 | .pm = &imx_thermal_pm_ops, |
728 | .of_match_table = of_imx_thermal_match, | |
729 | }, | |
730 | .probe = imx_thermal_probe, | |
731 | .remove = imx_thermal_remove, | |
732 | }; | |
733 | module_platform_driver(imx_thermal); | |
734 | ||
735 | MODULE_AUTHOR("Freescale Semiconductor, Inc."); | |
736 | MODULE_DESCRIPTION("Thermal driver for Freescale i.MX SoCs"); | |
737 | MODULE_LICENSE("GPL v2"); | |
738 | MODULE_ALIAS("platform:imx-thermal"); |