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> | |
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 | ||
3c94f17e AH |
73 | #define TEMPMON_IMX6Q 1 |
74 | #define TEMPMON_IMX6SX 2 | |
75 | ||
76 | struct thermal_soc_data { | |
77 | u32 version; | |
78 | }; | |
79 | ||
80 | static struct thermal_soc_data thermal_imx6q_data = { | |
81 | .version = TEMPMON_IMX6Q, | |
82 | }; | |
83 | ||
84 | static struct thermal_soc_data thermal_imx6sx_data = { | |
85 | .version = TEMPMON_IMX6SX, | |
86 | }; | |
87 | ||
ca3de46b | 88 | struct imx_thermal_data { |
4d753aa7 | 89 | struct cpufreq_policy *policy; |
ca3de46b SG |
90 | struct thermal_zone_device *tz; |
91 | struct thermal_cooling_device *cdev; | |
92 | enum thermal_device_mode mode; | |
93 | struct regmap *tempmon; | |
ae621557 | 94 | u32 c1, c2; /* See formula in imx_init_calib() */ |
17e8351a SH |
95 | int temp_passive; |
96 | int temp_critical; | |
a2291bad | 97 | int temp_max; |
17e8351a SH |
98 | int alarm_temp; |
99 | int last_temp; | |
37713a1e PZ |
100 | bool irq_enabled; |
101 | int irq; | |
329fe7b1 | 102 | struct clk *thermal_clk; |
3c94f17e | 103 | const struct thermal_soc_data *socdata; |
a2291bad | 104 | const char *temp_grade; |
ca3de46b SG |
105 | }; |
106 | ||
3c94f17e | 107 | static void imx_set_panic_temp(struct imx_thermal_data *data, |
17e8351a | 108 | int panic_temp) |
3c94f17e AH |
109 | { |
110 | struct regmap *map = data->tempmon; | |
111 | int critical_value; | |
112 | ||
113 | critical_value = (data->c2 - panic_temp) / data->c1; | |
114 | regmap_write(map, TEMPSENSE2 + REG_CLR, TEMPSENSE2_PANIC_VALUE_MASK); | |
115 | regmap_write(map, TEMPSENSE2 + REG_SET, critical_value << | |
116 | TEMPSENSE2_PANIC_VALUE_SHIFT); | |
117 | } | |
118 | ||
37713a1e | 119 | static void imx_set_alarm_temp(struct imx_thermal_data *data, |
17e8351a | 120 | int alarm_temp) |
37713a1e PZ |
121 | { |
122 | struct regmap *map = data->tempmon; | |
123 | int alarm_value; | |
124 | ||
125 | data->alarm_temp = alarm_temp; | |
749e8be7 | 126 | alarm_value = (data->c2 - alarm_temp) / data->c1; |
37713a1e PZ |
127 | regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_ALARM_VALUE_MASK); |
128 | regmap_write(map, TEMPSENSE0 + REG_SET, alarm_value << | |
129 | TEMPSENSE0_ALARM_VALUE_SHIFT); | |
130 | } | |
131 | ||
17e8351a | 132 | static int imx_get_temp(struct thermal_zone_device *tz, int *temp) |
ca3de46b SG |
133 | { |
134 | struct imx_thermal_data *data = tz->devdata; | |
135 | struct regmap *map = data->tempmon; | |
ca3de46b | 136 | unsigned int n_meas; |
37713a1e | 137 | bool wait; |
ca3de46b SG |
138 | u32 val; |
139 | ||
37713a1e PZ |
140 | if (data->mode == THERMAL_DEVICE_ENABLED) { |
141 | /* Check if a measurement is currently in progress */ | |
142 | regmap_read(map, TEMPSENSE0, &val); | |
143 | wait = !(val & TEMPSENSE0_FINISHED); | |
144 | } else { | |
145 | /* | |
146 | * Every time we measure the temperature, we will power on the | |
147 | * temperature sensor, enable measurements, take a reading, | |
148 | * disable measurements, power off the temperature sensor. | |
149 | */ | |
150 | regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN); | |
151 | regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP); | |
152 | ||
153 | wait = true; | |
154 | } | |
ca3de46b SG |
155 | |
156 | /* | |
157 | * According to the temp sensor designers, it may require up to ~17us | |
158 | * to complete a measurement. | |
159 | */ | |
37713a1e PZ |
160 | if (wait) |
161 | usleep_range(20, 50); | |
ca3de46b SG |
162 | |
163 | regmap_read(map, TEMPSENSE0, &val); | |
37713a1e PZ |
164 | |
165 | if (data->mode != THERMAL_DEVICE_ENABLED) { | |
166 | regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP); | |
167 | regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN); | |
168 | } | |
ca3de46b SG |
169 | |
170 | if ((val & TEMPSENSE0_FINISHED) == 0) { | |
171 | dev_dbg(&tz->device, "temp measurement never finished\n"); | |
172 | return -EAGAIN; | |
173 | } | |
174 | ||
175 | n_meas = (val & TEMPSENSE0_TEMP_CNT_MASK) >> TEMPSENSE0_TEMP_CNT_SHIFT; | |
176 | ||
ae621557 | 177 | /* See imx_init_calib() for formula derivation */ |
749e8be7 | 178 | *temp = data->c2 - n_meas * data->c1; |
ca3de46b | 179 | |
3c94f17e AH |
180 | /* Update alarm value to next higher trip point for TEMPMON_IMX6Q */ |
181 | if (data->socdata->version == TEMPMON_IMX6Q) { | |
182 | if (data->alarm_temp == data->temp_passive && | |
183 | *temp >= data->temp_passive) | |
184 | imx_set_alarm_temp(data, data->temp_critical); | |
185 | if (data->alarm_temp == data->temp_critical && | |
186 | *temp < data->temp_passive) { | |
187 | imx_set_alarm_temp(data, data->temp_passive); | |
17e8351a | 188 | dev_dbg(&tz->device, "thermal alarm off: T < %d\n", |
3c94f17e AH |
189 | data->alarm_temp / 1000); |
190 | } | |
37713a1e PZ |
191 | } |
192 | ||
193 | if (*temp != data->last_temp) { | |
17e8351a | 194 | dev_dbg(&tz->device, "millicelsius: %d\n", *temp); |
37713a1e PZ |
195 | data->last_temp = *temp; |
196 | } | |
197 | ||
198 | /* Reenable alarm IRQ if temperature below alarm temperature */ | |
199 | if (!data->irq_enabled && *temp < data->alarm_temp) { | |
200 | data->irq_enabled = true; | |
201 | enable_irq(data->irq); | |
ca3de46b SG |
202 | } |
203 | ||
204 | return 0; | |
205 | } | |
206 | ||
207 | static int imx_get_mode(struct thermal_zone_device *tz, | |
208 | enum thermal_device_mode *mode) | |
209 | { | |
210 | struct imx_thermal_data *data = tz->devdata; | |
211 | ||
212 | *mode = data->mode; | |
213 | ||
214 | return 0; | |
215 | } | |
216 | ||
217 | static int imx_set_mode(struct thermal_zone_device *tz, | |
218 | enum thermal_device_mode mode) | |
219 | { | |
220 | struct imx_thermal_data *data = tz->devdata; | |
37713a1e | 221 | struct regmap *map = data->tempmon; |
ca3de46b SG |
222 | |
223 | if (mode == THERMAL_DEVICE_ENABLED) { | |
224 | tz->polling_delay = IMX_POLLING_DELAY; | |
225 | tz->passive_delay = IMX_PASSIVE_DELAY; | |
37713a1e PZ |
226 | |
227 | regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN); | |
228 | regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP); | |
229 | ||
230 | if (!data->irq_enabled) { | |
231 | data->irq_enabled = true; | |
232 | enable_irq(data->irq); | |
233 | } | |
ca3de46b | 234 | } else { |
37713a1e PZ |
235 | regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP); |
236 | regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN); | |
237 | ||
ca3de46b SG |
238 | tz->polling_delay = 0; |
239 | tz->passive_delay = 0; | |
37713a1e PZ |
240 | |
241 | if (data->irq_enabled) { | |
242 | disable_irq(data->irq); | |
243 | data->irq_enabled = false; | |
244 | } | |
ca3de46b SG |
245 | } |
246 | ||
247 | data->mode = mode; | |
0e70f466 | 248 | thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED); |
ca3de46b SG |
249 | |
250 | return 0; | |
251 | } | |
252 | ||
253 | static int imx_get_trip_type(struct thermal_zone_device *tz, int trip, | |
254 | enum thermal_trip_type *type) | |
255 | { | |
256 | *type = (trip == IMX_TRIP_PASSIVE) ? THERMAL_TRIP_PASSIVE : | |
257 | THERMAL_TRIP_CRITICAL; | |
258 | return 0; | |
259 | } | |
260 | ||
17e8351a | 261 | static int imx_get_crit_temp(struct thermal_zone_device *tz, int *temp) |
ca3de46b | 262 | { |
017e5142 PZ |
263 | struct imx_thermal_data *data = tz->devdata; |
264 | ||
265 | *temp = data->temp_critical; | |
ca3de46b SG |
266 | return 0; |
267 | } | |
268 | ||
269 | static int imx_get_trip_temp(struct thermal_zone_device *tz, int trip, | |
17e8351a | 270 | int *temp) |
ca3de46b | 271 | { |
017e5142 PZ |
272 | struct imx_thermal_data *data = tz->devdata; |
273 | ||
274 | *temp = (trip == IMX_TRIP_PASSIVE) ? data->temp_passive : | |
275 | data->temp_critical; | |
276 | return 0; | |
277 | } | |
278 | ||
279 | static int imx_set_trip_temp(struct thermal_zone_device *tz, int trip, | |
17e8351a | 280 | int temp) |
017e5142 PZ |
281 | { |
282 | struct imx_thermal_data *data = tz->devdata; | |
283 | ||
a2291bad | 284 | /* do not allow changing critical threshold */ |
017e5142 PZ |
285 | if (trip == IMX_TRIP_CRITICAL) |
286 | return -EPERM; | |
287 | ||
a2291bad TH |
288 | /* do not allow passive to be set higher than critical */ |
289 | if (temp < 0 || temp > data->temp_critical) | |
017e5142 PZ |
290 | return -EINVAL; |
291 | ||
292 | data->temp_passive = temp; | |
293 | ||
37713a1e PZ |
294 | imx_set_alarm_temp(data, temp); |
295 | ||
ca3de46b SG |
296 | return 0; |
297 | } | |
298 | ||
299 | static int imx_bind(struct thermal_zone_device *tz, | |
300 | struct thermal_cooling_device *cdev) | |
301 | { | |
302 | int ret; | |
303 | ||
304 | ret = thermal_zone_bind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev, | |
305 | THERMAL_NO_LIMIT, | |
6cd9e9f6 KS |
306 | THERMAL_NO_LIMIT, |
307 | THERMAL_WEIGHT_DEFAULT); | |
ca3de46b SG |
308 | if (ret) { |
309 | dev_err(&tz->device, | |
310 | "binding zone %s with cdev %s failed:%d\n", | |
311 | tz->type, cdev->type, ret); | |
312 | return ret; | |
313 | } | |
314 | ||
315 | return 0; | |
316 | } | |
317 | ||
318 | static int imx_unbind(struct thermal_zone_device *tz, | |
319 | struct thermal_cooling_device *cdev) | |
320 | { | |
321 | int ret; | |
322 | ||
323 | ret = thermal_zone_unbind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev); | |
324 | if (ret) { | |
325 | dev_err(&tz->device, | |
326 | "unbinding zone %s with cdev %s failed:%d\n", | |
327 | tz->type, cdev->type, ret); | |
328 | return ret; | |
329 | } | |
330 | ||
331 | return 0; | |
332 | } | |
333 | ||
cbb07bb3 | 334 | static struct thermal_zone_device_ops imx_tz_ops = { |
ca3de46b SG |
335 | .bind = imx_bind, |
336 | .unbind = imx_unbind, | |
337 | .get_temp = imx_get_temp, | |
338 | .get_mode = imx_get_mode, | |
339 | .set_mode = imx_set_mode, | |
340 | .get_trip_type = imx_get_trip_type, | |
341 | .get_trip_temp = imx_get_trip_temp, | |
342 | .get_crit_temp = imx_get_crit_temp, | |
017e5142 | 343 | .set_trip_temp = imx_set_trip_temp, |
ca3de46b SG |
344 | }; |
345 | ||
e4bb2240 | 346 | static int imx_init_calib(struct platform_device *pdev, u32 ocotp_ana1) |
ca3de46b SG |
347 | { |
348 | struct imx_thermal_data *data = platform_get_drvdata(pdev); | |
4e5f61ca | 349 | int n1; |
749e8be7 | 350 | u64 temp64; |
ca3de46b | 351 | |
e4bb2240 | 352 | if (ocotp_ana1 == 0 || ocotp_ana1 == ~0) { |
ca3de46b SG |
353 | dev_err(&pdev->dev, "invalid sensor calibration data\n"); |
354 | return -EINVAL; | |
355 | } | |
356 | ||
357 | /* | |
c5bbdb4b UKK |
358 | * The sensor is calibrated at 25 °C (aka T1) and the value measured |
359 | * (aka N1) at this temperature is provided in bits [31:20] in the | |
360 | * i.MX's OCOTP value ANA1. | |
361 | * To find the actual temperature T, the following formula has to be used | |
362 | * when reading value n from the sensor: | |
363 | * | |
4e5f61ca UKK |
364 | * T = T1 + (N - N1) / (0.4148468 - 0.0015423 * N1) °C + 3.580661 °C |
365 | * = [T1' - N1 / (0.4148468 - 0.0015423 * N1) °C] + N / (0.4148468 - 0.0015423 * N1) °C | |
366 | * = [T1' + N1 / (0.0015423 * N1 - 0.4148468) °C] - N / (0.0015423 * N1 - 0.4148468) °C | |
c5bbdb4b UKK |
367 | * = c2 - c1 * N |
368 | * | |
369 | * with | |
370 | * | |
4e5f61ca UKK |
371 | * T1' = 28.580661 °C |
372 | * c1 = 1 / (0.0015423 * N1 - 0.4297157) °C | |
373 | * c2 = T1' + N1 / (0.0015423 * N1 - 0.4148468) °C | |
374 | * = T1' + N1 * c1 | |
ca3de46b | 375 | */ |
e4bb2240 | 376 | n1 = ocotp_ana1 >> 20; |
ca3de46b | 377 | |
4e5f61ca | 378 | temp64 = 10000000; /* use 10^7 as fixed point constant for values in formula */ |
c5bbdb4b | 379 | temp64 *= 1000; /* to get result in °mC */ |
4e5f61ca | 380 | do_div(temp64, 15423 * n1 - 4148468); |
749e8be7 | 381 | data->c1 = temp64; |
4e5f61ca | 382 | data->c2 = n1 * data->c1 + 28581; |
ca3de46b | 383 | |
ae621557 LC |
384 | return 0; |
385 | } | |
386 | ||
e4bb2240 | 387 | static void imx_init_temp_grade(struct platform_device *pdev, u32 ocotp_mem0) |
ae621557 LC |
388 | { |
389 | struct imx_thermal_data *data = platform_get_drvdata(pdev); | |
a2291bad TH |
390 | |
391 | /* The maximum die temp is specified by the Temperature Grade */ | |
e4bb2240 | 392 | switch ((ocotp_mem0 >> 6) & 0x3) { |
339d7492 | 393 | case 0: /* Commercial (0 to 95 °C) */ |
a2291bad TH |
394 | data->temp_grade = "Commercial"; |
395 | data->temp_max = 95000; | |
396 | break; | |
339d7492 | 397 | case 1: /* Extended Commercial (-20 °C to 105 °C) */ |
a2291bad TH |
398 | data->temp_grade = "Extended Commercial"; |
399 | data->temp_max = 105000; | |
400 | break; | |
339d7492 | 401 | case 2: /* Industrial (-40 °C to 105 °C) */ |
a2291bad TH |
402 | data->temp_grade = "Industrial"; |
403 | data->temp_max = 105000; | |
404 | break; | |
339d7492 | 405 | case 3: /* Automotive (-40 °C to 125 °C) */ |
a2291bad TH |
406 | data->temp_grade = "Automotive"; |
407 | data->temp_max = 125000; | |
408 | break; | |
409 | } | |
017e5142 PZ |
410 | |
411 | /* | |
339d7492 UKK |
412 | * Set the critical trip point at 5 °C under max |
413 | * Set the passive trip point at 10 °C under max (changeable via sysfs) | |
017e5142 | 414 | */ |
a2291bad TH |
415 | data->temp_critical = data->temp_max - (1000 * 5); |
416 | data->temp_passive = data->temp_max - (1000 * 10); | |
ae621557 LC |
417 | } |
418 | ||
419 | static int imx_init_from_tempmon_data(struct platform_device *pdev) | |
420 | { | |
421 | struct regmap *map; | |
422 | int ret; | |
423 | u32 val; | |
424 | ||
425 | map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, | |
426 | "fsl,tempmon-data"); | |
427 | if (IS_ERR(map)) { | |
428 | ret = PTR_ERR(map); | |
429 | dev_err(&pdev->dev, "failed to get sensor regmap: %d\n", ret); | |
430 | return ret; | |
431 | } | |
432 | ||
433 | ret = regmap_read(map, OCOTP_ANA1, &val); | |
434 | if (ret) { | |
435 | dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret); | |
436 | return ret; | |
437 | } | |
438 | ret = imx_init_calib(pdev, val); | |
439 | if (ret) | |
440 | return ret; | |
441 | ||
442 | ret = regmap_read(map, OCOTP_MEM0, &val); | |
443 | if (ret) { | |
444 | dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret); | |
445 | return ret; | |
446 | } | |
447 | imx_init_temp_grade(pdev, val); | |
448 | ||
449 | return 0; | |
450 | } | |
451 | ||
452 | static int imx_init_from_nvmem_cells(struct platform_device *pdev) | |
453 | { | |
454 | int ret; | |
455 | u32 val; | |
456 | ||
457 | ret = nvmem_cell_read_u32(&pdev->dev, "calib", &val); | |
458 | if (ret) | |
459 | return ret; | |
460 | imx_init_calib(pdev, val); | |
461 | ||
462 | ret = nvmem_cell_read_u32(&pdev->dev, "temp_grade", &val); | |
463 | if (ret) | |
464 | return ret; | |
465 | imx_init_temp_grade(pdev, val); | |
017e5142 | 466 | |
ca3de46b SG |
467 | return 0; |
468 | } | |
469 | ||
37713a1e PZ |
470 | static irqreturn_t imx_thermal_alarm_irq(int irq, void *dev) |
471 | { | |
472 | struct imx_thermal_data *data = dev; | |
473 | ||
474 | disable_irq_nosync(irq); | |
475 | data->irq_enabled = false; | |
476 | ||
477 | return IRQ_WAKE_THREAD; | |
478 | } | |
479 | ||
480 | static irqreturn_t imx_thermal_alarm_irq_thread(int irq, void *dev) | |
481 | { | |
482 | struct imx_thermal_data *data = dev; | |
483 | ||
17e8351a | 484 | dev_dbg(&data->tz->device, "THERMAL ALARM: T > %d\n", |
37713a1e PZ |
485 | data->alarm_temp / 1000); |
486 | ||
0e70f466 | 487 | thermal_zone_device_update(data->tz, THERMAL_EVENT_UNSPECIFIED); |
37713a1e PZ |
488 | |
489 | return IRQ_HANDLED; | |
490 | } | |
491 | ||
3c94f17e AH |
492 | static const struct of_device_id of_imx_thermal_match[] = { |
493 | { .compatible = "fsl,imx6q-tempmon", .data = &thermal_imx6q_data, }, | |
494 | { .compatible = "fsl,imx6sx-tempmon", .data = &thermal_imx6sx_data, }, | |
495 | { /* end */ } | |
496 | }; | |
497 | MODULE_DEVICE_TABLE(of, of_imx_thermal_match); | |
498 | ||
ca3de46b SG |
499 | static int imx_thermal_probe(struct platform_device *pdev) |
500 | { | |
501 | struct imx_thermal_data *data; | |
ca3de46b | 502 | struct regmap *map; |
37713a1e | 503 | int measure_freq; |
ca3de46b SG |
504 | int ret; |
505 | ||
506 | data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); | |
507 | if (!data) | |
508 | return -ENOMEM; | |
509 | ||
510 | map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "fsl,tempmon"); | |
511 | if (IS_ERR(map)) { | |
512 | ret = PTR_ERR(map); | |
513 | dev_err(&pdev->dev, "failed to get tempmon regmap: %d\n", ret); | |
514 | return ret; | |
515 | } | |
516 | data->tempmon = map; | |
517 | ||
829bc78a | 518 | data->socdata = of_device_get_match_data(&pdev->dev); |
8b051ec3 SV |
519 | if (!data->socdata) { |
520 | dev_err(&pdev->dev, "no device match found\n"); | |
521 | return -ENODEV; | |
522 | } | |
3c94f17e AH |
523 | |
524 | /* make sure the IRQ flag is clear before enabling irq on i.MX6SX */ | |
525 | if (data->socdata->version == TEMPMON_IMX6SX) { | |
526 | regmap_write(map, MISC1 + REG_CLR, MISC1_IRQ_TEMPHIGH | | |
527 | MISC1_IRQ_TEMPLOW | MISC1_IRQ_TEMPPANIC); | |
528 | /* | |
529 | * reset value of LOW ALARM is incorrect, set it to lowest | |
530 | * value to avoid false trigger of low alarm. | |
531 | */ | |
532 | regmap_write(map, TEMPSENSE2 + REG_SET, | |
533 | TEMPSENSE2_LOW_VALUE_MASK); | |
534 | } | |
535 | ||
37713a1e PZ |
536 | data->irq = platform_get_irq(pdev, 0); |
537 | if (data->irq < 0) | |
538 | return data->irq; | |
539 | ||
ca3de46b SG |
540 | platform_set_drvdata(pdev, data); |
541 | ||
ae621557 LC |
542 | if (of_find_property(pdev->dev.of_node, "nvmem-cells", NULL)) { |
543 | ret = imx_init_from_nvmem_cells(pdev); | |
544 | if (ret == -EPROBE_DEFER) | |
545 | return ret; | |
546 | if (ret) { | |
547 | dev_err(&pdev->dev, "failed to init from nvmem: %d\n", | |
548 | ret); | |
549 | return ret; | |
550 | } | |
551 | } else { | |
552 | ret = imx_init_from_tempmon_data(pdev); | |
553 | if (ret) { | |
554 | dev_err(&pdev->dev, "failed to init from from fsl,tempmon-data\n"); | |
555 | return ret; | |
556 | } | |
ca3de46b SG |
557 | } |
558 | ||
559 | /* Make sure sensor is in known good state for measurements */ | |
560 | regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN); | |
561 | regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP); | |
562 | regmap_write(map, TEMPSENSE1 + REG_CLR, TEMPSENSE1_MEASURE_FREQ); | |
563 | regmap_write(map, MISC0 + REG_SET, MISC0_REFTOP_SELBIASOFF); | |
564 | regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN); | |
565 | ||
4d753aa7 VK |
566 | data->policy = cpufreq_cpu_get(0); |
567 | if (!data->policy) { | |
568 | pr_debug("%s: CPUFreq policy not found\n", __func__); | |
569 | return -EPROBE_DEFER; | |
570 | } | |
571 | ||
572 | data->cdev = cpufreq_cooling_register(data->policy); | |
ca3de46b SG |
573 | if (IS_ERR(data->cdev)) { |
574 | ret = PTR_ERR(data->cdev); | |
4d753aa7 VK |
575 | dev_err(&pdev->dev, |
576 | "failed to register cpufreq cooling device: %d\n", ret); | |
577 | cpufreq_cpu_put(data->policy); | |
ca3de46b SG |
578 | return ret; |
579 | } | |
580 | ||
90a21ff5 HK |
581 | data->thermal_clk = devm_clk_get(&pdev->dev, NULL); |
582 | if (IS_ERR(data->thermal_clk)) { | |
583 | ret = PTR_ERR(data->thermal_clk); | |
584 | if (ret != -EPROBE_DEFER) | |
585 | dev_err(&pdev->dev, | |
586 | "failed to get thermal clk: %d\n", ret); | |
587 | cpufreq_cooling_unregister(data->cdev); | |
4d753aa7 | 588 | cpufreq_cpu_put(data->policy); |
90a21ff5 HK |
589 | return ret; |
590 | } | |
591 | ||
592 | /* | |
593 | * Thermal sensor needs clk on to get correct value, normally | |
594 | * we should enable its clk before taking measurement and disable | |
595 | * clk after measurement is done, but if alarm function is enabled, | |
596 | * hardware will auto measure the temperature periodically, so we | |
597 | * need to keep the clk always on for alarm function. | |
598 | */ | |
599 | ret = clk_prepare_enable(data->thermal_clk); | |
600 | if (ret) { | |
601 | dev_err(&pdev->dev, "failed to enable thermal clk: %d\n", ret); | |
602 | cpufreq_cooling_unregister(data->cdev); | |
4d753aa7 | 603 | cpufreq_cpu_put(data->policy); |
90a21ff5 HK |
604 | return ret; |
605 | } | |
606 | ||
ca3de46b | 607 | data->tz = thermal_zone_device_register("imx_thermal_zone", |
017e5142 PZ |
608 | IMX_TRIP_NUM, |
609 | BIT(IMX_TRIP_PASSIVE), data, | |
ca3de46b SG |
610 | &imx_tz_ops, NULL, |
611 | IMX_PASSIVE_DELAY, | |
612 | IMX_POLLING_DELAY); | |
613 | if (IS_ERR(data->tz)) { | |
614 | ret = PTR_ERR(data->tz); | |
615 | dev_err(&pdev->dev, | |
616 | "failed to register thermal zone device %d\n", ret); | |
90a21ff5 | 617 | clk_disable_unprepare(data->thermal_clk); |
ca3de46b | 618 | cpufreq_cooling_unregister(data->cdev); |
4d753aa7 | 619 | cpufreq_cpu_put(data->policy); |
ca3de46b SG |
620 | return ret; |
621 | } | |
622 | ||
a2291bad TH |
623 | dev_info(&pdev->dev, "%s CPU temperature grade - max:%dC" |
624 | " critical:%dC passive:%dC\n", data->temp_grade, | |
625 | data->temp_max / 1000, data->temp_critical / 1000, | |
626 | data->temp_passive / 1000); | |
627 | ||
37713a1e PZ |
628 | /* Enable measurements at ~ 10 Hz */ |
629 | regmap_write(map, TEMPSENSE1 + REG_CLR, TEMPSENSE1_MEASURE_FREQ); | |
630 | measure_freq = DIV_ROUND_UP(32768, 10); /* 10 Hz */ | |
631 | regmap_write(map, TEMPSENSE1 + REG_SET, measure_freq); | |
632 | imx_set_alarm_temp(data, data->temp_passive); | |
3c94f17e AH |
633 | |
634 | if (data->socdata->version == TEMPMON_IMX6SX) | |
635 | imx_set_panic_temp(data, data->temp_critical); | |
636 | ||
37713a1e PZ |
637 | regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN); |
638 | regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP); | |
639 | ||
cf1ba1d7 ML |
640 | data->irq_enabled = true; |
641 | data->mode = THERMAL_DEVICE_ENABLED; | |
642 | ||
84866ee5 BP |
643 | ret = devm_request_threaded_irq(&pdev->dev, data->irq, |
644 | imx_thermal_alarm_irq, imx_thermal_alarm_irq_thread, | |
645 | 0, "imx_thermal", data); | |
646 | if (ret < 0) { | |
647 | dev_err(&pdev->dev, "failed to request alarm irq: %d\n", ret); | |
648 | clk_disable_unprepare(data->thermal_clk); | |
649 | thermal_zone_device_unregister(data->tz); | |
650 | cpufreq_cooling_unregister(data->cdev); | |
4d753aa7 | 651 | cpufreq_cpu_put(data->policy); |
84866ee5 BP |
652 | return ret; |
653 | } | |
654 | ||
ca3de46b SG |
655 | return 0; |
656 | } | |
657 | ||
658 | static int imx_thermal_remove(struct platform_device *pdev) | |
659 | { | |
660 | struct imx_thermal_data *data = platform_get_drvdata(pdev); | |
37713a1e PZ |
661 | struct regmap *map = data->tempmon; |
662 | ||
663 | /* Disable measurements */ | |
664 | regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN); | |
329fe7b1 AH |
665 | if (!IS_ERR(data->thermal_clk)) |
666 | clk_disable_unprepare(data->thermal_clk); | |
ca3de46b SG |
667 | |
668 | thermal_zone_device_unregister(data->tz); | |
669 | cpufreq_cooling_unregister(data->cdev); | |
4d753aa7 | 670 | cpufreq_cpu_put(data->policy); |
ca3de46b SG |
671 | |
672 | return 0; | |
673 | } | |
674 | ||
675 | #ifdef CONFIG_PM_SLEEP | |
676 | static int imx_thermal_suspend(struct device *dev) | |
677 | { | |
678 | struct imx_thermal_data *data = dev_get_drvdata(dev); | |
679 | struct regmap *map = data->tempmon; | |
ca3de46b | 680 | |
b46cce59 AH |
681 | /* |
682 | * Need to disable thermal sensor, otherwise, when thermal core | |
683 | * try to get temperature before thermal sensor resume, a wrong | |
684 | * temperature will be read as the thermal sensor is powered | |
685 | * down. | |
686 | */ | |
687 | regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP); | |
688 | regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN); | |
689 | data->mode = THERMAL_DEVICE_DISABLED; | |
d26eef8b | 690 | clk_disable_unprepare(data->thermal_clk); |
ca3de46b SG |
691 | |
692 | return 0; | |
693 | } | |
694 | ||
695 | static int imx_thermal_resume(struct device *dev) | |
696 | { | |
b46cce59 AH |
697 | struct imx_thermal_data *data = dev_get_drvdata(dev); |
698 | struct regmap *map = data->tempmon; | |
e3bdc8d7 | 699 | int ret; |
b46cce59 | 700 | |
e3bdc8d7 AY |
701 | ret = clk_prepare_enable(data->thermal_clk); |
702 | if (ret) | |
703 | return ret; | |
b46cce59 AH |
704 | /* Enabled thermal sensor after resume */ |
705 | regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN); | |
706 | regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP); | |
707 | data->mode = THERMAL_DEVICE_ENABLED; | |
708 | ||
ca3de46b SG |
709 | return 0; |
710 | } | |
711 | #endif | |
712 | ||
713 | static SIMPLE_DEV_PM_OPS(imx_thermal_pm_ops, | |
714 | imx_thermal_suspend, imx_thermal_resume); | |
715 | ||
ca3de46b SG |
716 | static struct platform_driver imx_thermal = { |
717 | .driver = { | |
718 | .name = "imx_thermal", | |
ca3de46b SG |
719 | .pm = &imx_thermal_pm_ops, |
720 | .of_match_table = of_imx_thermal_match, | |
721 | }, | |
722 | .probe = imx_thermal_probe, | |
723 | .remove = imx_thermal_remove, | |
724 | }; | |
725 | module_platform_driver(imx_thermal); | |
726 | ||
727 | MODULE_AUTHOR("Freescale Semiconductor, Inc."); | |
728 | MODULE_DESCRIPTION("Thermal driver for Freescale i.MX SoCs"); | |
729 | MODULE_LICENSE("GPL v2"); | |
730 | MODULE_ALIAS("platform:imx-thermal"); |