1 | // SPDX-License-Identifier: GPL-2.0 |
2 | // |
3 | // Copyright 2013 Freescale Semiconductor, Inc. |
4 | |
5 | #include <linux/clk.h> |
6 | #include <linux/cpufreq.h> |
7 | #include <linux/cpu_cooling.h> |
8 | #include <linux/delay.h> |
9 | #include <linux/interrupt.h> |
10 | #include <linux/io.h> |
11 | #include <linux/mfd/syscon.h> |
12 | #include <linux/module.h> |
13 | #include <linux/of.h> |
14 | #include <linux/platform_device.h> |
15 | #include <linux/regmap.h> |
16 | #include <linux/thermal.h> |
17 | #include <linux/nvmem-consumer.h> |
18 | #include <linux/pm_runtime.h> |
19 | |
20 | #define REG_SET 0x4 |
21 | #define REG_CLR 0x8 |
22 | #define REG_TOG 0xc |
23 | |
24 | /* i.MX6 specific */ |
25 | #define IMX6_MISC0 0x0150 |
26 | #define IMX6_MISC0_REFTOP_SELBIASOFF (1 << 3) |
27 | #define IMX6_MISC1 0x0160 |
28 | #define IMX6_MISC1_IRQ_TEMPHIGH (1 << 29) |
29 | /* Below LOW and PANIC bits are only for TEMPMON_IMX6SX */ |
30 | #define IMX6_MISC1_IRQ_TEMPLOW (1 << 28) |
31 | #define IMX6_MISC1_IRQ_TEMPPANIC (1 << 27) |
32 | |
33 | #define IMX6_TEMPSENSE0 0x0180 |
34 | #define IMX6_TEMPSENSE0_ALARM_VALUE_SHIFT 20 |
35 | #define IMX6_TEMPSENSE0_ALARM_VALUE_MASK (0xfff << 20) |
36 | #define IMX6_TEMPSENSE0_TEMP_CNT_SHIFT 8 |
37 | #define IMX6_TEMPSENSE0_TEMP_CNT_MASK (0xfff << 8) |
38 | #define IMX6_TEMPSENSE0_FINISHED (1 << 2) |
39 | #define IMX6_TEMPSENSE0_MEASURE_TEMP (1 << 1) |
40 | #define IMX6_TEMPSENSE0_POWER_DOWN (1 << 0) |
41 | |
42 | #define IMX6_TEMPSENSE1 0x0190 |
43 | #define IMX6_TEMPSENSE1_MEASURE_FREQ 0xffff |
44 | #define IMX6_TEMPSENSE1_MEASURE_FREQ_SHIFT 0 |
45 | |
46 | #define OCOTP_MEM0 0x0480 |
47 | #define OCOTP_ANA1 0x04e0 |
48 | |
49 | /* Below TEMPSENSE2 is only for TEMPMON_IMX6SX */ |
50 | #define IMX6_TEMPSENSE2 0x0290 |
51 | #define IMX6_TEMPSENSE2_LOW_VALUE_SHIFT 0 |
52 | #define IMX6_TEMPSENSE2_LOW_VALUE_MASK 0xfff |
53 | #define IMX6_TEMPSENSE2_PANIC_VALUE_SHIFT 16 |
54 | #define IMX6_TEMPSENSE2_PANIC_VALUE_MASK 0xfff0000 |
55 | |
56 | /* i.MX7 specific */ |
57 | #define IMX7_ANADIG_DIGPROG 0x800 |
58 | #define IMX7_TEMPSENSE0 0x300 |
59 | #define IMX7_TEMPSENSE0_PANIC_ALARM_SHIFT 18 |
60 | #define IMX7_TEMPSENSE0_PANIC_ALARM_MASK (0x1ff << 18) |
61 | #define IMX7_TEMPSENSE0_HIGH_ALARM_SHIFT 9 |
62 | #define IMX7_TEMPSENSE0_HIGH_ALARM_MASK (0x1ff << 9) |
63 | #define IMX7_TEMPSENSE0_LOW_ALARM_SHIFT 0 |
64 | #define IMX7_TEMPSENSE0_LOW_ALARM_MASK 0x1ff |
65 | |
66 | #define IMX7_TEMPSENSE1 0x310 |
67 | #define IMX7_TEMPSENSE1_MEASURE_FREQ_SHIFT 16 |
68 | #define IMX7_TEMPSENSE1_MEASURE_FREQ_MASK (0xffff << 16) |
69 | #define IMX7_TEMPSENSE1_FINISHED (1 << 11) |
70 | #define IMX7_TEMPSENSE1_MEASURE_TEMP (1 << 10) |
71 | #define IMX7_TEMPSENSE1_POWER_DOWN (1 << 9) |
72 | #define IMX7_TEMPSENSE1_TEMP_VALUE_SHIFT 0 |
73 | #define IMX7_TEMPSENSE1_TEMP_VALUE_MASK 0x1ff |
74 | |
75 | /* The driver supports 1 passive trip point and 1 critical trip point */ |
76 | enum imx_thermal_trip { |
77 | IMX_TRIP_PASSIVE, |
78 | IMX_TRIP_CRITICAL, |
79 | }; |
80 | |
81 | #define IMX_POLLING_DELAY 2000 /* millisecond */ |
82 | #define IMX_PASSIVE_DELAY 1000 |
83 | |
84 | #define TEMPMON_IMX6Q 1 |
85 | #define TEMPMON_IMX6SX 2 |
86 | #define TEMPMON_IMX7D 3 |
87 | |
88 | struct thermal_soc_data { |
89 | u32 version; |
90 | |
91 | u32 sensor_ctrl; |
92 | u32 power_down_mask; |
93 | u32 measure_temp_mask; |
94 | |
95 | u32 measure_freq_ctrl; |
96 | u32 measure_freq_mask; |
97 | u32 measure_freq_shift; |
98 | |
99 | u32 temp_data; |
100 | u32 temp_value_mask; |
101 | u32 temp_value_shift; |
102 | u32 temp_valid_mask; |
103 | |
104 | u32 panic_alarm_ctrl; |
105 | u32 panic_alarm_mask; |
106 | u32 panic_alarm_shift; |
107 | |
108 | u32 high_alarm_ctrl; |
109 | u32 high_alarm_mask; |
110 | u32 high_alarm_shift; |
111 | |
112 | u32 low_alarm_ctrl; |
113 | u32 low_alarm_mask; |
114 | u32 low_alarm_shift; |
115 | }; |
116 | |
117 | static struct thermal_trip trips[] = { |
118 | [IMX_TRIP_PASSIVE] = { .type = THERMAL_TRIP_PASSIVE }, |
119 | [IMX_TRIP_CRITICAL] = { .type = THERMAL_TRIP_CRITICAL }, |
120 | }; |
121 | |
122 | static struct thermal_soc_data thermal_imx6q_data = { |
123 | .version = TEMPMON_IMX6Q, |
124 | |
125 | .sensor_ctrl = IMX6_TEMPSENSE0, |
126 | .power_down_mask = IMX6_TEMPSENSE0_POWER_DOWN, |
127 | .measure_temp_mask = IMX6_TEMPSENSE0_MEASURE_TEMP, |
128 | |
129 | .measure_freq_ctrl = IMX6_TEMPSENSE1, |
130 | .measure_freq_shift = IMX6_TEMPSENSE1_MEASURE_FREQ_SHIFT, |
131 | .measure_freq_mask = IMX6_TEMPSENSE1_MEASURE_FREQ, |
132 | |
133 | .temp_data = IMX6_TEMPSENSE0, |
134 | .temp_value_mask = IMX6_TEMPSENSE0_TEMP_CNT_MASK, |
135 | .temp_value_shift = IMX6_TEMPSENSE0_TEMP_CNT_SHIFT, |
136 | .temp_valid_mask = IMX6_TEMPSENSE0_FINISHED, |
137 | |
138 | .high_alarm_ctrl = IMX6_TEMPSENSE0, |
139 | .high_alarm_mask = IMX6_TEMPSENSE0_ALARM_VALUE_MASK, |
140 | .high_alarm_shift = IMX6_TEMPSENSE0_ALARM_VALUE_SHIFT, |
141 | }; |
142 | |
143 | static struct thermal_soc_data thermal_imx6sx_data = { |
144 | .version = TEMPMON_IMX6SX, |
145 | |
146 | .sensor_ctrl = IMX6_TEMPSENSE0, |
147 | .power_down_mask = IMX6_TEMPSENSE0_POWER_DOWN, |
148 | .measure_temp_mask = IMX6_TEMPSENSE0_MEASURE_TEMP, |
149 | |
150 | .measure_freq_ctrl = IMX6_TEMPSENSE1, |
151 | .measure_freq_shift = IMX6_TEMPSENSE1_MEASURE_FREQ_SHIFT, |
152 | .measure_freq_mask = IMX6_TEMPSENSE1_MEASURE_FREQ, |
153 | |
154 | .temp_data = IMX6_TEMPSENSE0, |
155 | .temp_value_mask = IMX6_TEMPSENSE0_TEMP_CNT_MASK, |
156 | .temp_value_shift = IMX6_TEMPSENSE0_TEMP_CNT_SHIFT, |
157 | .temp_valid_mask = IMX6_TEMPSENSE0_FINISHED, |
158 | |
159 | .high_alarm_ctrl = IMX6_TEMPSENSE0, |
160 | .high_alarm_mask = IMX6_TEMPSENSE0_ALARM_VALUE_MASK, |
161 | .high_alarm_shift = IMX6_TEMPSENSE0_ALARM_VALUE_SHIFT, |
162 | |
163 | .panic_alarm_ctrl = IMX6_TEMPSENSE2, |
164 | .panic_alarm_mask = IMX6_TEMPSENSE2_PANIC_VALUE_MASK, |
165 | .panic_alarm_shift = IMX6_TEMPSENSE2_PANIC_VALUE_SHIFT, |
166 | |
167 | .low_alarm_ctrl = IMX6_TEMPSENSE2, |
168 | .low_alarm_mask = IMX6_TEMPSENSE2_LOW_VALUE_MASK, |
169 | .low_alarm_shift = IMX6_TEMPSENSE2_LOW_VALUE_SHIFT, |
170 | }; |
171 | |
172 | static struct thermal_soc_data thermal_imx7d_data = { |
173 | .version = TEMPMON_IMX7D, |
174 | |
175 | .sensor_ctrl = IMX7_TEMPSENSE1, |
176 | .power_down_mask = IMX7_TEMPSENSE1_POWER_DOWN, |
177 | .measure_temp_mask = IMX7_TEMPSENSE1_MEASURE_TEMP, |
178 | |
179 | .measure_freq_ctrl = IMX7_TEMPSENSE1, |
180 | .measure_freq_shift = IMX7_TEMPSENSE1_MEASURE_FREQ_SHIFT, |
181 | .measure_freq_mask = IMX7_TEMPSENSE1_MEASURE_FREQ_MASK, |
182 | |
183 | .temp_data = IMX7_TEMPSENSE1, |
184 | .temp_value_mask = IMX7_TEMPSENSE1_TEMP_VALUE_MASK, |
185 | .temp_value_shift = IMX7_TEMPSENSE1_TEMP_VALUE_SHIFT, |
186 | .temp_valid_mask = IMX7_TEMPSENSE1_FINISHED, |
187 | |
188 | .panic_alarm_ctrl = IMX7_TEMPSENSE1, |
189 | .panic_alarm_mask = IMX7_TEMPSENSE0_PANIC_ALARM_MASK, |
190 | .panic_alarm_shift = IMX7_TEMPSENSE0_PANIC_ALARM_SHIFT, |
191 | |
192 | .high_alarm_ctrl = IMX7_TEMPSENSE0, |
193 | .high_alarm_mask = IMX7_TEMPSENSE0_HIGH_ALARM_MASK, |
194 | .high_alarm_shift = IMX7_TEMPSENSE0_HIGH_ALARM_SHIFT, |
195 | |
196 | .low_alarm_ctrl = IMX7_TEMPSENSE0, |
197 | .low_alarm_mask = IMX7_TEMPSENSE0_LOW_ALARM_MASK, |
198 | .low_alarm_shift = IMX7_TEMPSENSE0_LOW_ALARM_SHIFT, |
199 | }; |
200 | |
201 | struct imx_thermal_data { |
202 | struct device *dev; |
203 | struct cpufreq_policy *policy; |
204 | struct thermal_zone_device *tz; |
205 | struct thermal_cooling_device *cdev; |
206 | struct regmap *tempmon; |
207 | u32 c1, c2; /* See formula in imx_init_calib() */ |
208 | int temp_max; |
209 | int alarm_temp; |
210 | int last_temp; |
211 | bool irq_enabled; |
212 | int irq; |
213 | struct clk *thermal_clk; |
214 | const struct thermal_soc_data *socdata; |
215 | const char *temp_grade; |
216 | }; |
217 | |
218 | static void imx_set_panic_temp(struct imx_thermal_data *data, |
219 | int panic_temp) |
220 | { |
221 | const struct thermal_soc_data *soc_data = data->socdata; |
222 | struct regmap *map = data->tempmon; |
223 | int critical_value; |
224 | |
225 | critical_value = (data->c2 - panic_temp) / data->c1; |
226 | |
227 | regmap_write(map, reg: soc_data->panic_alarm_ctrl + REG_CLR, |
228 | val: soc_data->panic_alarm_mask); |
229 | regmap_write(map, reg: soc_data->panic_alarm_ctrl + REG_SET, |
230 | val: critical_value << soc_data->panic_alarm_shift); |
231 | } |
232 | |
233 | static void imx_set_alarm_temp(struct imx_thermal_data *data, |
234 | int alarm_temp) |
235 | { |
236 | struct regmap *map = data->tempmon; |
237 | const struct thermal_soc_data *soc_data = data->socdata; |
238 | int alarm_value; |
239 | |
240 | data->alarm_temp = alarm_temp; |
241 | |
242 | if (data->socdata->version == TEMPMON_IMX7D) |
243 | alarm_value = alarm_temp / 1000 + data->c1 - 25; |
244 | else |
245 | alarm_value = (data->c2 - alarm_temp) / data->c1; |
246 | |
247 | regmap_write(map, reg: soc_data->high_alarm_ctrl + REG_CLR, |
248 | val: soc_data->high_alarm_mask); |
249 | regmap_write(map, reg: soc_data->high_alarm_ctrl + REG_SET, |
250 | val: alarm_value << soc_data->high_alarm_shift); |
251 | } |
252 | |
253 | static int imx_get_temp(struct thermal_zone_device *tz, int *temp) |
254 | { |
255 | struct imx_thermal_data *data = thermal_zone_device_priv(tzd: tz); |
256 | const struct thermal_soc_data *soc_data = data->socdata; |
257 | struct regmap *map = data->tempmon; |
258 | unsigned int n_meas; |
259 | u32 val; |
260 | int ret; |
261 | |
262 | ret = pm_runtime_resume_and_get(dev: data->dev); |
263 | if (ret < 0) |
264 | return ret; |
265 | |
266 | regmap_read(map, reg: soc_data->temp_data, val: &val); |
267 | |
268 | if ((val & soc_data->temp_valid_mask) == 0) |
269 | return -EAGAIN; |
270 | |
271 | n_meas = (val & soc_data->temp_value_mask) |
272 | >> soc_data->temp_value_shift; |
273 | |
274 | /* See imx_init_calib() for formula derivation */ |
275 | if (data->socdata->version == TEMPMON_IMX7D) |
276 | *temp = (n_meas - data->c1 + 25) * 1000; |
277 | else |
278 | *temp = data->c2 - n_meas * data->c1; |
279 | |
280 | /* Update alarm value to next higher trip point for TEMPMON_IMX6Q */ |
281 | if (data->socdata->version == TEMPMON_IMX6Q) { |
282 | if (data->alarm_temp == trips[IMX_TRIP_PASSIVE].temperature && |
283 | *temp >= trips[IMX_TRIP_PASSIVE].temperature) |
284 | imx_set_alarm_temp(data, alarm_temp: trips[IMX_TRIP_CRITICAL].temperature); |
285 | if (data->alarm_temp == trips[IMX_TRIP_CRITICAL].temperature && |
286 | *temp < trips[IMX_TRIP_PASSIVE].temperature) { |
287 | imx_set_alarm_temp(data, alarm_temp: trips[IMX_TRIP_PASSIVE].temperature); |
288 | dev_dbg(data->dev, "thermal alarm off: T < %d\n" , |
289 | data->alarm_temp / 1000); |
290 | } |
291 | } |
292 | |
293 | if (*temp != data->last_temp) { |
294 | dev_dbg(data->dev, "millicelsius: %d\n" , *temp); |
295 | data->last_temp = *temp; |
296 | } |
297 | |
298 | /* Reenable alarm IRQ if temperature below alarm temperature */ |
299 | if (!data->irq_enabled && *temp < data->alarm_temp) { |
300 | data->irq_enabled = true; |
301 | enable_irq(irq: data->irq); |
302 | } |
303 | |
304 | pm_runtime_put(dev: data->dev); |
305 | |
306 | return 0; |
307 | } |
308 | |
309 | static int imx_change_mode(struct thermal_zone_device *tz, |
310 | enum thermal_device_mode mode) |
311 | { |
312 | struct imx_thermal_data *data = thermal_zone_device_priv(tzd: tz); |
313 | |
314 | if (mode == THERMAL_DEVICE_ENABLED) { |
315 | pm_runtime_get(dev: data->dev); |
316 | |
317 | if (!data->irq_enabled) { |
318 | data->irq_enabled = true; |
319 | enable_irq(irq: data->irq); |
320 | } |
321 | } else { |
322 | pm_runtime_put(dev: data->dev); |
323 | |
324 | if (data->irq_enabled) { |
325 | disable_irq(irq: data->irq); |
326 | data->irq_enabled = false; |
327 | } |
328 | } |
329 | |
330 | return 0; |
331 | } |
332 | |
333 | static int imx_set_trip_temp(struct thermal_zone_device *tz, int trip_id, |
334 | int temp) |
335 | { |
336 | struct imx_thermal_data *data = thermal_zone_device_priv(tzd: tz); |
337 | struct thermal_trip trip; |
338 | int ret; |
339 | |
340 | ret = pm_runtime_resume_and_get(dev: data->dev); |
341 | if (ret < 0) |
342 | return ret; |
343 | |
344 | ret = __thermal_zone_get_trip(tz, trip_id, trip: &trip); |
345 | if (ret) |
346 | return ret; |
347 | |
348 | /* do not allow changing critical threshold */ |
349 | if (trip.type == THERMAL_TRIP_CRITICAL) |
350 | return -EPERM; |
351 | |
352 | /* do not allow passive to be set higher than critical */ |
353 | if (temp < 0 || temp > trips[IMX_TRIP_CRITICAL].temperature) |
354 | return -EINVAL; |
355 | |
356 | imx_set_alarm_temp(data, alarm_temp: temp); |
357 | |
358 | pm_runtime_put(dev: data->dev); |
359 | |
360 | return 0; |
361 | } |
362 | |
363 | static int imx_bind(struct thermal_zone_device *tz, |
364 | struct thermal_cooling_device *cdev) |
365 | { |
366 | return thermal_zone_bind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev, |
367 | THERMAL_NO_LIMIT, |
368 | THERMAL_NO_LIMIT, |
369 | THERMAL_WEIGHT_DEFAULT); |
370 | } |
371 | |
372 | static int imx_unbind(struct thermal_zone_device *tz, |
373 | struct thermal_cooling_device *cdev) |
374 | { |
375 | return thermal_zone_unbind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev); |
376 | } |
377 | |
378 | static struct thermal_zone_device_ops imx_tz_ops = { |
379 | .bind = imx_bind, |
380 | .unbind = imx_unbind, |
381 | .get_temp = imx_get_temp, |
382 | .change_mode = imx_change_mode, |
383 | .set_trip_temp = imx_set_trip_temp, |
384 | }; |
385 | |
386 | static int imx_init_calib(struct platform_device *pdev, u32 ocotp_ana1) |
387 | { |
388 | struct imx_thermal_data *data = platform_get_drvdata(pdev); |
389 | int n1; |
390 | u64 temp64; |
391 | |
392 | if (ocotp_ana1 == 0 || ocotp_ana1 == ~0) { |
393 | dev_err(&pdev->dev, "invalid sensor calibration data\n" ); |
394 | return -EINVAL; |
395 | } |
396 | |
397 | /* |
398 | * On i.MX7D, we only use the calibration data at 25C to get the temp, |
399 | * Tmeas = ( Nmeas - n1) + 25; n1 is the fuse value for 25C. |
400 | */ |
401 | if (data->socdata->version == TEMPMON_IMX7D) { |
402 | data->c1 = (ocotp_ana1 >> 9) & 0x1ff; |
403 | return 0; |
404 | } |
405 | |
406 | /* |
407 | * The sensor is calibrated at 25 °C (aka T1) and the value measured |
408 | * (aka N1) at this temperature is provided in bits [31:20] in the |
409 | * i.MX's OCOTP value ANA1. |
410 | * To find the actual temperature T, the following formula has to be used |
411 | * when reading value n from the sensor: |
412 | * |
413 | * T = T1 + (N - N1) / (0.4148468 - 0.0015423 * N1) °C + 3.580661 °C |
414 | * = [T1' - N1 / (0.4148468 - 0.0015423 * N1) °C] + N / (0.4148468 - 0.0015423 * N1) °C |
415 | * = [T1' + N1 / (0.0015423 * N1 - 0.4148468) °C] - N / (0.0015423 * N1 - 0.4148468) °C |
416 | * = c2 - c1 * N |
417 | * |
418 | * with |
419 | * |
420 | * T1' = 28.580661 °C |
421 | * c1 = 1 / (0.0015423 * N1 - 0.4297157) °C |
422 | * c2 = T1' + N1 / (0.0015423 * N1 - 0.4148468) °C |
423 | * = T1' + N1 * c1 |
424 | */ |
425 | n1 = ocotp_ana1 >> 20; |
426 | |
427 | temp64 = 10000000; /* use 10^7 as fixed point constant for values in formula */ |
428 | temp64 *= 1000; /* to get result in °mC */ |
429 | do_div(temp64, 15423 * n1 - 4148468); |
430 | data->c1 = temp64; |
431 | data->c2 = n1 * data->c1 + 28581; |
432 | |
433 | return 0; |
434 | } |
435 | |
436 | static void imx_init_temp_grade(struct platform_device *pdev, u32 ocotp_mem0) |
437 | { |
438 | struct imx_thermal_data *data = platform_get_drvdata(pdev); |
439 | |
440 | /* The maximum die temp is specified by the Temperature Grade */ |
441 | switch ((ocotp_mem0 >> 6) & 0x3) { |
442 | case 0: /* Commercial (0 to 95 °C) */ |
443 | data->temp_grade = "Commercial" ; |
444 | data->temp_max = 95000; |
445 | break; |
446 | case 1: /* Extended Commercial (-20 °C to 105 °C) */ |
447 | data->temp_grade = "Extended Commercial" ; |
448 | data->temp_max = 105000; |
449 | break; |
450 | case 2: /* Industrial (-40 °C to 105 °C) */ |
451 | data->temp_grade = "Industrial" ; |
452 | data->temp_max = 105000; |
453 | break; |
454 | case 3: /* Automotive (-40 °C to 125 °C) */ |
455 | data->temp_grade = "Automotive" ; |
456 | data->temp_max = 125000; |
457 | break; |
458 | } |
459 | |
460 | /* |
461 | * Set the critical trip point at 5 °C under max |
462 | * Set the passive trip point at 10 °C under max (changeable via sysfs) |
463 | */ |
464 | trips[IMX_TRIP_PASSIVE].temperature = data->temp_max - (1000 * 10); |
465 | trips[IMX_TRIP_CRITICAL].temperature = data->temp_max - (1000 * 5); |
466 | } |
467 | |
468 | static int imx_init_from_tempmon_data(struct platform_device *pdev) |
469 | { |
470 | struct regmap *map; |
471 | int ret; |
472 | u32 val; |
473 | |
474 | map = syscon_regmap_lookup_by_phandle(np: pdev->dev.of_node, |
475 | property: "fsl,tempmon-data" ); |
476 | if (IS_ERR(ptr: map)) { |
477 | ret = PTR_ERR(ptr: map); |
478 | dev_err(&pdev->dev, "failed to get sensor regmap: %d\n" , ret); |
479 | return ret; |
480 | } |
481 | |
482 | ret = regmap_read(map, OCOTP_ANA1, val: &val); |
483 | if (ret) { |
484 | dev_err(&pdev->dev, "failed to read sensor data: %d\n" , ret); |
485 | return ret; |
486 | } |
487 | ret = imx_init_calib(pdev, ocotp_ana1: val); |
488 | if (ret) |
489 | return ret; |
490 | |
491 | ret = regmap_read(map, OCOTP_MEM0, val: &val); |
492 | if (ret) { |
493 | dev_err(&pdev->dev, "failed to read sensor data: %d\n" , ret); |
494 | return ret; |
495 | } |
496 | imx_init_temp_grade(pdev, ocotp_mem0: val); |
497 | |
498 | return 0; |
499 | } |
500 | |
501 | static int imx_init_from_nvmem_cells(struct platform_device *pdev) |
502 | { |
503 | int ret; |
504 | u32 val; |
505 | |
506 | ret = nvmem_cell_read_u32(dev: &pdev->dev, cell_id: "calib" , val: &val); |
507 | if (ret) |
508 | return ret; |
509 | |
510 | ret = imx_init_calib(pdev, ocotp_ana1: val); |
511 | if (ret) |
512 | return ret; |
513 | |
514 | ret = nvmem_cell_read_u32(dev: &pdev->dev, cell_id: "temp_grade" , val: &val); |
515 | if (ret) |
516 | return ret; |
517 | imx_init_temp_grade(pdev, ocotp_mem0: val); |
518 | |
519 | return 0; |
520 | } |
521 | |
522 | static irqreturn_t imx_thermal_alarm_irq(int irq, void *dev) |
523 | { |
524 | struct imx_thermal_data *data = dev; |
525 | |
526 | disable_irq_nosync(irq); |
527 | data->irq_enabled = false; |
528 | |
529 | return IRQ_WAKE_THREAD; |
530 | } |
531 | |
532 | static irqreturn_t imx_thermal_alarm_irq_thread(int irq, void *dev) |
533 | { |
534 | struct imx_thermal_data *data = dev; |
535 | |
536 | dev_dbg(data->dev, "THERMAL ALARM: T > %d\n" , data->alarm_temp / 1000); |
537 | |
538 | thermal_zone_device_update(data->tz, THERMAL_EVENT_UNSPECIFIED); |
539 | |
540 | return IRQ_HANDLED; |
541 | } |
542 | |
543 | static const struct of_device_id of_imx_thermal_match[] = { |
544 | { .compatible = "fsl,imx6q-tempmon" , .data = &thermal_imx6q_data, }, |
545 | { .compatible = "fsl,imx6sx-tempmon" , .data = &thermal_imx6sx_data, }, |
546 | { .compatible = "fsl,imx7d-tempmon" , .data = &thermal_imx7d_data, }, |
547 | { /* end */ } |
548 | }; |
549 | MODULE_DEVICE_TABLE(of, of_imx_thermal_match); |
550 | |
551 | #ifdef CONFIG_CPU_FREQ |
552 | /* |
553 | * Create cooling device in case no #cooling-cells property is available in |
554 | * CPU node |
555 | */ |
556 | static int imx_thermal_register_legacy_cooling(struct imx_thermal_data *data) |
557 | { |
558 | struct device_node *np; |
559 | int ret = 0; |
560 | |
561 | data->policy = cpufreq_cpu_get(cpu: 0); |
562 | if (!data->policy) { |
563 | pr_debug("%s: CPUFreq policy not found\n" , __func__); |
564 | return -EPROBE_DEFER; |
565 | } |
566 | |
567 | np = of_get_cpu_node(cpu: data->policy->cpu, NULL); |
568 | |
569 | if (!np || !of_property_present(np, propname: "#cooling-cells" )) { |
570 | data->cdev = cpufreq_cooling_register(policy: data->policy); |
571 | if (IS_ERR(ptr: data->cdev)) { |
572 | ret = PTR_ERR(ptr: data->cdev); |
573 | cpufreq_cpu_put(policy: data->policy); |
574 | } |
575 | } |
576 | |
577 | of_node_put(node: np); |
578 | |
579 | return ret; |
580 | } |
581 | |
582 | static void imx_thermal_unregister_legacy_cooling(struct imx_thermal_data *data) |
583 | { |
584 | cpufreq_cooling_unregister(cdev: data->cdev); |
585 | cpufreq_cpu_put(policy: data->policy); |
586 | } |
587 | |
588 | #else |
589 | |
590 | static inline int imx_thermal_register_legacy_cooling(struct imx_thermal_data *data) |
591 | { |
592 | return 0; |
593 | } |
594 | |
595 | static inline void imx_thermal_unregister_legacy_cooling(struct imx_thermal_data *data) |
596 | { |
597 | } |
598 | #endif |
599 | |
600 | static int imx_thermal_probe(struct platform_device *pdev) |
601 | { |
602 | struct imx_thermal_data *data; |
603 | struct regmap *map; |
604 | int measure_freq; |
605 | int ret; |
606 | |
607 | data = devm_kzalloc(dev: &pdev->dev, size: sizeof(*data), GFP_KERNEL); |
608 | if (!data) |
609 | return -ENOMEM; |
610 | |
611 | data->dev = &pdev->dev; |
612 | |
613 | map = syscon_regmap_lookup_by_phandle(np: pdev->dev.of_node, property: "fsl,tempmon" ); |
614 | if (IS_ERR(ptr: map)) { |
615 | ret = PTR_ERR(ptr: map); |
616 | dev_err(&pdev->dev, "failed to get tempmon regmap: %d\n" , ret); |
617 | return ret; |
618 | } |
619 | data->tempmon = map; |
620 | |
621 | data->socdata = of_device_get_match_data(dev: &pdev->dev); |
622 | if (!data->socdata) { |
623 | dev_err(&pdev->dev, "no device match found\n" ); |
624 | return -ENODEV; |
625 | } |
626 | |
627 | /* make sure the IRQ flag is clear before enabling irq on i.MX6SX */ |
628 | if (data->socdata->version == TEMPMON_IMX6SX) { |
629 | regmap_write(map, IMX6_MISC1 + REG_CLR, |
630 | IMX6_MISC1_IRQ_TEMPHIGH | IMX6_MISC1_IRQ_TEMPLOW |
631 | | IMX6_MISC1_IRQ_TEMPPANIC); |
632 | /* |
633 | * reset value of LOW ALARM is incorrect, set it to lowest |
634 | * value to avoid false trigger of low alarm. |
635 | */ |
636 | regmap_write(map, reg: data->socdata->low_alarm_ctrl + REG_SET, |
637 | val: data->socdata->low_alarm_mask); |
638 | } |
639 | |
640 | data->irq = platform_get_irq(pdev, 0); |
641 | if (data->irq < 0) |
642 | return data->irq; |
643 | |
644 | platform_set_drvdata(pdev, data); |
645 | |
646 | if (of_property_present(np: pdev->dev.of_node, propname: "nvmem-cells" )) { |
647 | ret = imx_init_from_nvmem_cells(pdev); |
648 | if (ret) |
649 | return dev_err_probe(dev: &pdev->dev, err: ret, |
650 | fmt: "failed to init from nvmem\n" ); |
651 | } else { |
652 | ret = imx_init_from_tempmon_data(pdev); |
653 | if (ret) { |
654 | dev_err(&pdev->dev, "failed to init from fsl,tempmon-data\n" ); |
655 | return ret; |
656 | } |
657 | } |
658 | |
659 | /* Make sure sensor is in known good state for measurements */ |
660 | regmap_write(map, reg: data->socdata->sensor_ctrl + REG_CLR, |
661 | val: data->socdata->power_down_mask); |
662 | regmap_write(map, reg: data->socdata->sensor_ctrl + REG_CLR, |
663 | val: data->socdata->measure_temp_mask); |
664 | regmap_write(map, reg: data->socdata->measure_freq_ctrl + REG_CLR, |
665 | val: data->socdata->measure_freq_mask); |
666 | if (data->socdata->version != TEMPMON_IMX7D) |
667 | regmap_write(map, IMX6_MISC0 + REG_SET, |
668 | IMX6_MISC0_REFTOP_SELBIASOFF); |
669 | regmap_write(map, reg: data->socdata->sensor_ctrl + REG_SET, |
670 | val: data->socdata->power_down_mask); |
671 | |
672 | ret = imx_thermal_register_legacy_cooling(data); |
673 | if (ret) |
674 | return dev_err_probe(dev: &pdev->dev, err: ret, |
675 | fmt: "failed to register cpufreq cooling device\n" ); |
676 | |
677 | data->thermal_clk = devm_clk_get(dev: &pdev->dev, NULL); |
678 | if (IS_ERR(ptr: data->thermal_clk)) { |
679 | ret = PTR_ERR(ptr: data->thermal_clk); |
680 | if (ret != -EPROBE_DEFER) |
681 | dev_err(&pdev->dev, |
682 | "failed to get thermal clk: %d\n" , ret); |
683 | goto legacy_cleanup; |
684 | } |
685 | |
686 | /* |
687 | * Thermal sensor needs clk on to get correct value, normally |
688 | * we should enable its clk before taking measurement and disable |
689 | * clk after measurement is done, but if alarm function is enabled, |
690 | * hardware will auto measure the temperature periodically, so we |
691 | * need to keep the clk always on for alarm function. |
692 | */ |
693 | ret = clk_prepare_enable(clk: data->thermal_clk); |
694 | if (ret) { |
695 | dev_err(&pdev->dev, "failed to enable thermal clk: %d\n" , ret); |
696 | goto legacy_cleanup; |
697 | } |
698 | |
699 | data->tz = thermal_zone_device_register_with_trips(type: "imx_thermal_zone" , |
700 | trips, |
701 | ARRAY_SIZE(trips), |
702 | BIT(IMX_TRIP_PASSIVE), devdata: data, |
703 | ops: &imx_tz_ops, NULL, |
704 | IMX_PASSIVE_DELAY, |
705 | IMX_POLLING_DELAY); |
706 | if (IS_ERR(ptr: data->tz)) { |
707 | ret = PTR_ERR(ptr: data->tz); |
708 | dev_err(&pdev->dev, |
709 | "failed to register thermal zone device %d\n" , ret); |
710 | goto clk_disable; |
711 | } |
712 | |
713 | dev_info(&pdev->dev, "%s CPU temperature grade - max:%dC" |
714 | " critical:%dC passive:%dC\n" , data->temp_grade, |
715 | data->temp_max / 1000, trips[IMX_TRIP_CRITICAL].temperature / 1000, |
716 | trips[IMX_TRIP_PASSIVE].temperature / 1000); |
717 | |
718 | /* Enable measurements at ~ 10 Hz */ |
719 | regmap_write(map, reg: data->socdata->measure_freq_ctrl + REG_CLR, |
720 | val: data->socdata->measure_freq_mask); |
721 | measure_freq = DIV_ROUND_UP(32768, 10); /* 10 Hz */ |
722 | regmap_write(map, reg: data->socdata->measure_freq_ctrl + REG_SET, |
723 | val: measure_freq << data->socdata->measure_freq_shift); |
724 | imx_set_alarm_temp(data, alarm_temp: trips[IMX_TRIP_PASSIVE].temperature); |
725 | |
726 | if (data->socdata->version == TEMPMON_IMX6SX) |
727 | imx_set_panic_temp(data, panic_temp: trips[IMX_TRIP_CRITICAL].temperature); |
728 | |
729 | regmap_write(map, reg: data->socdata->sensor_ctrl + REG_CLR, |
730 | val: data->socdata->power_down_mask); |
731 | regmap_write(map, reg: data->socdata->sensor_ctrl + REG_SET, |
732 | val: data->socdata->measure_temp_mask); |
733 | /* After power up, we need a delay before first access can be done. */ |
734 | usleep_range(min: 20, max: 50); |
735 | |
736 | /* the core was configured and enabled just before */ |
737 | pm_runtime_set_active(dev: &pdev->dev); |
738 | pm_runtime_enable(dev: data->dev); |
739 | |
740 | ret = pm_runtime_resume_and_get(dev: data->dev); |
741 | if (ret < 0) |
742 | goto disable_runtime_pm; |
743 | |
744 | data->irq_enabled = true; |
745 | ret = thermal_zone_device_enable(tz: data->tz); |
746 | if (ret) |
747 | goto thermal_zone_unregister; |
748 | |
749 | ret = devm_request_threaded_irq(dev: &pdev->dev, irq: data->irq, |
750 | handler: imx_thermal_alarm_irq, thread_fn: imx_thermal_alarm_irq_thread, |
751 | irqflags: 0, devname: "imx_thermal" , dev_id: data); |
752 | if (ret < 0) { |
753 | dev_err(&pdev->dev, "failed to request alarm irq: %d\n" , ret); |
754 | goto thermal_zone_unregister; |
755 | } |
756 | |
757 | pm_runtime_put(dev: data->dev); |
758 | |
759 | return 0; |
760 | |
761 | thermal_zone_unregister: |
762 | thermal_zone_device_unregister(tz: data->tz); |
763 | disable_runtime_pm: |
764 | pm_runtime_put_noidle(dev: data->dev); |
765 | pm_runtime_disable(dev: data->dev); |
766 | clk_disable: |
767 | clk_disable_unprepare(clk: data->thermal_clk); |
768 | legacy_cleanup: |
769 | imx_thermal_unregister_legacy_cooling(data); |
770 | |
771 | return ret; |
772 | } |
773 | |
774 | static void imx_thermal_remove(struct platform_device *pdev) |
775 | { |
776 | struct imx_thermal_data *data = platform_get_drvdata(pdev); |
777 | |
778 | pm_runtime_put_noidle(dev: data->dev); |
779 | pm_runtime_disable(dev: data->dev); |
780 | |
781 | thermal_zone_device_unregister(tz: data->tz); |
782 | imx_thermal_unregister_legacy_cooling(data); |
783 | } |
784 | |
785 | static int __maybe_unused imx_thermal_suspend(struct device *dev) |
786 | { |
787 | struct imx_thermal_data *data = dev_get_drvdata(dev); |
788 | int ret; |
789 | |
790 | /* |
791 | * Need to disable thermal sensor, otherwise, when thermal core |
792 | * try to get temperature before thermal sensor resume, a wrong |
793 | * temperature will be read as the thermal sensor is powered |
794 | * down. This is done in change_mode() operation called from |
795 | * thermal_zone_device_disable() |
796 | */ |
797 | ret = thermal_zone_device_disable(tz: data->tz); |
798 | if (ret) |
799 | return ret; |
800 | |
801 | return pm_runtime_force_suspend(dev: data->dev); |
802 | } |
803 | |
804 | static int __maybe_unused imx_thermal_resume(struct device *dev) |
805 | { |
806 | struct imx_thermal_data *data = dev_get_drvdata(dev); |
807 | int ret; |
808 | |
809 | ret = pm_runtime_force_resume(dev: data->dev); |
810 | if (ret) |
811 | return ret; |
812 | /* Enabled thermal sensor after resume */ |
813 | return thermal_zone_device_enable(tz: data->tz); |
814 | } |
815 | |
816 | static int __maybe_unused imx_thermal_runtime_suspend(struct device *dev) |
817 | { |
818 | struct imx_thermal_data *data = dev_get_drvdata(dev); |
819 | const struct thermal_soc_data *socdata = data->socdata; |
820 | struct regmap *map = data->tempmon; |
821 | int ret; |
822 | |
823 | ret = regmap_write(map, reg: socdata->sensor_ctrl + REG_CLR, |
824 | val: socdata->measure_temp_mask); |
825 | if (ret) |
826 | return ret; |
827 | |
828 | ret = regmap_write(map, reg: socdata->sensor_ctrl + REG_SET, |
829 | val: socdata->power_down_mask); |
830 | if (ret) |
831 | return ret; |
832 | |
833 | clk_disable_unprepare(clk: data->thermal_clk); |
834 | |
835 | return 0; |
836 | } |
837 | |
838 | static int __maybe_unused imx_thermal_runtime_resume(struct device *dev) |
839 | { |
840 | struct imx_thermal_data *data = dev_get_drvdata(dev); |
841 | const struct thermal_soc_data *socdata = data->socdata; |
842 | struct regmap *map = data->tempmon; |
843 | int ret; |
844 | |
845 | ret = clk_prepare_enable(clk: data->thermal_clk); |
846 | if (ret) |
847 | return ret; |
848 | |
849 | ret = regmap_write(map, reg: socdata->sensor_ctrl + REG_CLR, |
850 | val: socdata->power_down_mask); |
851 | if (ret) |
852 | return ret; |
853 | |
854 | ret = regmap_write(map, reg: socdata->sensor_ctrl + REG_SET, |
855 | val: socdata->measure_temp_mask); |
856 | if (ret) |
857 | return ret; |
858 | |
859 | /* |
860 | * According to the temp sensor designers, it may require up to ~17us |
861 | * to complete a measurement. |
862 | */ |
863 | usleep_range(min: 20, max: 50); |
864 | |
865 | return 0; |
866 | } |
867 | |
868 | static const struct dev_pm_ops imx_thermal_pm_ops = { |
869 | SET_SYSTEM_SLEEP_PM_OPS(imx_thermal_suspend, imx_thermal_resume) |
870 | SET_RUNTIME_PM_OPS(imx_thermal_runtime_suspend, |
871 | imx_thermal_runtime_resume, NULL) |
872 | }; |
873 | |
874 | static struct platform_driver imx_thermal = { |
875 | .driver = { |
876 | .name = "imx_thermal" , |
877 | .pm = &imx_thermal_pm_ops, |
878 | .of_match_table = of_imx_thermal_match, |
879 | }, |
880 | .probe = imx_thermal_probe, |
881 | .remove_new = imx_thermal_remove, |
882 | }; |
883 | module_platform_driver(imx_thermal); |
884 | |
885 | MODULE_AUTHOR("Freescale Semiconductor, Inc." ); |
886 | MODULE_DESCRIPTION("Thermal driver for Freescale i.MX SoCs" ); |
887 | MODULE_LICENSE("GPL v2" ); |
888 | MODULE_ALIAS("platform:imx-thermal" ); |
889 | |