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 | .flags = THERMAL_TRIP_FLAG_RW_TEMP }, |
120 | [IMX_TRIP_CRITICAL] = { .type = THERMAL_TRIP_CRITICAL }, |
121 | }; |
122 | |
123 | static struct thermal_soc_data thermal_imx6q_data = { |
124 | .version = TEMPMON_IMX6Q, |
125 | |
126 | .sensor_ctrl = IMX6_TEMPSENSE0, |
127 | .power_down_mask = IMX6_TEMPSENSE0_POWER_DOWN, |
128 | .measure_temp_mask = IMX6_TEMPSENSE0_MEASURE_TEMP, |
129 | |
130 | .measure_freq_ctrl = IMX6_TEMPSENSE1, |
131 | .measure_freq_shift = IMX6_TEMPSENSE1_MEASURE_FREQ_SHIFT, |
132 | .measure_freq_mask = IMX6_TEMPSENSE1_MEASURE_FREQ, |
133 | |
134 | .temp_data = IMX6_TEMPSENSE0, |
135 | .temp_value_mask = IMX6_TEMPSENSE0_TEMP_CNT_MASK, |
136 | .temp_value_shift = IMX6_TEMPSENSE0_TEMP_CNT_SHIFT, |
137 | .temp_valid_mask = IMX6_TEMPSENSE0_FINISHED, |
138 | |
139 | .high_alarm_ctrl = IMX6_TEMPSENSE0, |
140 | .high_alarm_mask = IMX6_TEMPSENSE0_ALARM_VALUE_MASK, |
141 | .high_alarm_shift = IMX6_TEMPSENSE0_ALARM_VALUE_SHIFT, |
142 | }; |
143 | |
144 | static struct thermal_soc_data thermal_imx6sx_data = { |
145 | .version = TEMPMON_IMX6SX, |
146 | |
147 | .sensor_ctrl = IMX6_TEMPSENSE0, |
148 | .power_down_mask = IMX6_TEMPSENSE0_POWER_DOWN, |
149 | .measure_temp_mask = IMX6_TEMPSENSE0_MEASURE_TEMP, |
150 | |
151 | .measure_freq_ctrl = IMX6_TEMPSENSE1, |
152 | .measure_freq_shift = IMX6_TEMPSENSE1_MEASURE_FREQ_SHIFT, |
153 | .measure_freq_mask = IMX6_TEMPSENSE1_MEASURE_FREQ, |
154 | |
155 | .temp_data = IMX6_TEMPSENSE0, |
156 | .temp_value_mask = IMX6_TEMPSENSE0_TEMP_CNT_MASK, |
157 | .temp_value_shift = IMX6_TEMPSENSE0_TEMP_CNT_SHIFT, |
158 | .temp_valid_mask = IMX6_TEMPSENSE0_FINISHED, |
159 | |
160 | .high_alarm_ctrl = IMX6_TEMPSENSE0, |
161 | .high_alarm_mask = IMX6_TEMPSENSE0_ALARM_VALUE_MASK, |
162 | .high_alarm_shift = IMX6_TEMPSENSE0_ALARM_VALUE_SHIFT, |
163 | |
164 | .panic_alarm_ctrl = IMX6_TEMPSENSE2, |
165 | .panic_alarm_mask = IMX6_TEMPSENSE2_PANIC_VALUE_MASK, |
166 | .panic_alarm_shift = IMX6_TEMPSENSE2_PANIC_VALUE_SHIFT, |
167 | |
168 | .low_alarm_ctrl = IMX6_TEMPSENSE2, |
169 | .low_alarm_mask = IMX6_TEMPSENSE2_LOW_VALUE_MASK, |
170 | .low_alarm_shift = IMX6_TEMPSENSE2_LOW_VALUE_SHIFT, |
171 | }; |
172 | |
173 | static struct thermal_soc_data thermal_imx7d_data = { |
174 | .version = TEMPMON_IMX7D, |
175 | |
176 | .sensor_ctrl = IMX7_TEMPSENSE1, |
177 | .power_down_mask = IMX7_TEMPSENSE1_POWER_DOWN, |
178 | .measure_temp_mask = IMX7_TEMPSENSE1_MEASURE_TEMP, |
179 | |
180 | .measure_freq_ctrl = IMX7_TEMPSENSE1, |
181 | .measure_freq_shift = IMX7_TEMPSENSE1_MEASURE_FREQ_SHIFT, |
182 | .measure_freq_mask = IMX7_TEMPSENSE1_MEASURE_FREQ_MASK, |
183 | |
184 | .temp_data = IMX7_TEMPSENSE1, |
185 | .temp_value_mask = IMX7_TEMPSENSE1_TEMP_VALUE_MASK, |
186 | .temp_value_shift = IMX7_TEMPSENSE1_TEMP_VALUE_SHIFT, |
187 | .temp_valid_mask = IMX7_TEMPSENSE1_FINISHED, |
188 | |
189 | .panic_alarm_ctrl = IMX7_TEMPSENSE1, |
190 | .panic_alarm_mask = IMX7_TEMPSENSE0_PANIC_ALARM_MASK, |
191 | .panic_alarm_shift = IMX7_TEMPSENSE0_PANIC_ALARM_SHIFT, |
192 | |
193 | .high_alarm_ctrl = IMX7_TEMPSENSE0, |
194 | .high_alarm_mask = IMX7_TEMPSENSE0_HIGH_ALARM_MASK, |
195 | .high_alarm_shift = IMX7_TEMPSENSE0_HIGH_ALARM_SHIFT, |
196 | |
197 | .low_alarm_ctrl = IMX7_TEMPSENSE0, |
198 | .low_alarm_mask = IMX7_TEMPSENSE0_LOW_ALARM_MASK, |
199 | .low_alarm_shift = IMX7_TEMPSENSE0_LOW_ALARM_SHIFT, |
200 | }; |
201 | |
202 | struct imx_thermal_data { |
203 | struct device *dev; |
204 | struct cpufreq_policy *policy; |
205 | struct thermal_zone_device *tz; |
206 | struct thermal_cooling_device *cdev; |
207 | struct regmap *tempmon; |
208 | u32 c1, c2; /* See formula in imx_init_calib() */ |
209 | int temp_max; |
210 | int alarm_temp; |
211 | int last_temp; |
212 | bool irq_enabled; |
213 | int irq; |
214 | struct clk *thermal_clk; |
215 | const struct thermal_soc_data *socdata; |
216 | const char *temp_grade; |
217 | }; |
218 | |
219 | static void imx_set_panic_temp(struct imx_thermal_data *data, |
220 | int panic_temp) |
221 | { |
222 | const struct thermal_soc_data *soc_data = data->socdata; |
223 | struct regmap *map = data->tempmon; |
224 | int critical_value; |
225 | |
226 | critical_value = (data->c2 - panic_temp) / data->c1; |
227 | |
228 | regmap_write(map, reg: soc_data->panic_alarm_ctrl + REG_CLR, |
229 | val: soc_data->panic_alarm_mask); |
230 | regmap_write(map, reg: soc_data->panic_alarm_ctrl + REG_SET, |
231 | val: critical_value << soc_data->panic_alarm_shift); |
232 | } |
233 | |
234 | static void imx_set_alarm_temp(struct imx_thermal_data *data, |
235 | int alarm_temp) |
236 | { |
237 | struct regmap *map = data->tempmon; |
238 | const struct thermal_soc_data *soc_data = data->socdata; |
239 | int alarm_value; |
240 | |
241 | data->alarm_temp = alarm_temp; |
242 | |
243 | if (data->socdata->version == TEMPMON_IMX7D) |
244 | alarm_value = alarm_temp / 1000 + data->c1 - 25; |
245 | else |
246 | alarm_value = (data->c2 - alarm_temp) / data->c1; |
247 | |
248 | regmap_write(map, reg: soc_data->high_alarm_ctrl + REG_CLR, |
249 | val: soc_data->high_alarm_mask); |
250 | regmap_write(map, reg: soc_data->high_alarm_ctrl + REG_SET, |
251 | val: alarm_value << soc_data->high_alarm_shift); |
252 | } |
253 | |
254 | static int imx_get_temp(struct thermal_zone_device *tz, int *temp) |
255 | { |
256 | struct imx_thermal_data *data = thermal_zone_device_priv(tzd: tz); |
257 | const struct thermal_soc_data *soc_data = data->socdata; |
258 | struct regmap *map = data->tempmon; |
259 | unsigned int n_meas; |
260 | u32 val; |
261 | int ret; |
262 | |
263 | ret = pm_runtime_resume_and_get(dev: data->dev); |
264 | if (ret < 0) |
265 | return ret; |
266 | |
267 | regmap_read(map, reg: soc_data->temp_data, val: &val); |
268 | |
269 | if ((val & soc_data->temp_valid_mask) == 0) |
270 | return -EAGAIN; |
271 | |
272 | n_meas = (val & soc_data->temp_value_mask) |
273 | >> soc_data->temp_value_shift; |
274 | |
275 | /* See imx_init_calib() for formula derivation */ |
276 | if (data->socdata->version == TEMPMON_IMX7D) |
277 | *temp = (n_meas - data->c1 + 25) * 1000; |
278 | else |
279 | *temp = data->c2 - n_meas * data->c1; |
280 | |
281 | /* Update alarm value to next higher trip point for TEMPMON_IMX6Q */ |
282 | if (data->socdata->version == TEMPMON_IMX6Q) { |
283 | if (data->alarm_temp == trips[IMX_TRIP_PASSIVE].temperature && |
284 | *temp >= trips[IMX_TRIP_PASSIVE].temperature) |
285 | imx_set_alarm_temp(data, alarm_temp: trips[IMX_TRIP_CRITICAL].temperature); |
286 | if (data->alarm_temp == trips[IMX_TRIP_CRITICAL].temperature && |
287 | *temp < trips[IMX_TRIP_PASSIVE].temperature) { |
288 | imx_set_alarm_temp(data, alarm_temp: trips[IMX_TRIP_PASSIVE].temperature); |
289 | dev_dbg(data->dev, "thermal alarm off: T < %d\n" , |
290 | data->alarm_temp / 1000); |
291 | } |
292 | } |
293 | |
294 | if (*temp != data->last_temp) { |
295 | dev_dbg(data->dev, "millicelsius: %d\n" , *temp); |
296 | data->last_temp = *temp; |
297 | } |
298 | |
299 | /* Reenable alarm IRQ if temperature below alarm temperature */ |
300 | if (!data->irq_enabled && *temp < data->alarm_temp) { |
301 | data->irq_enabled = true; |
302 | enable_irq(irq: data->irq); |
303 | } |
304 | |
305 | pm_runtime_put(dev: data->dev); |
306 | |
307 | return 0; |
308 | } |
309 | |
310 | static int imx_change_mode(struct thermal_zone_device *tz, |
311 | enum thermal_device_mode mode) |
312 | { |
313 | struct imx_thermal_data *data = thermal_zone_device_priv(tzd: tz); |
314 | |
315 | if (mode == THERMAL_DEVICE_ENABLED) { |
316 | pm_runtime_get(dev: data->dev); |
317 | |
318 | if (!data->irq_enabled) { |
319 | data->irq_enabled = true; |
320 | enable_irq(irq: data->irq); |
321 | } |
322 | } else { |
323 | pm_runtime_put(dev: data->dev); |
324 | |
325 | if (data->irq_enabled) { |
326 | disable_irq(irq: data->irq); |
327 | data->irq_enabled = false; |
328 | } |
329 | } |
330 | |
331 | return 0; |
332 | } |
333 | |
334 | static int imx_set_trip_temp(struct thermal_zone_device *tz, int trip_id, |
335 | int temp) |
336 | { |
337 | struct imx_thermal_data *data = thermal_zone_device_priv(tzd: tz); |
338 | struct thermal_trip trip; |
339 | int ret; |
340 | |
341 | ret = pm_runtime_resume_and_get(dev: data->dev); |
342 | if (ret < 0) |
343 | return ret; |
344 | |
345 | ret = __thermal_zone_get_trip(tz, trip_id, trip: &trip); |
346 | if (ret) |
347 | return ret; |
348 | |
349 | /* do not allow changing critical threshold */ |
350 | if (trip.type == THERMAL_TRIP_CRITICAL) |
351 | return -EPERM; |
352 | |
353 | /* do not allow passive to be set higher than critical */ |
354 | if (temp < 0 || temp > trips[IMX_TRIP_CRITICAL].temperature) |
355 | return -EINVAL; |
356 | |
357 | imx_set_alarm_temp(data, alarm_temp: temp); |
358 | trips[IMX_TRIP_PASSIVE].temperature = temp; |
359 | |
360 | pm_runtime_put(dev: data->dev); |
361 | |
362 | return 0; |
363 | } |
364 | |
365 | static int imx_bind(struct thermal_zone_device *tz, |
366 | struct thermal_cooling_device *cdev) |
367 | { |
368 | return thermal_zone_bind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev, |
369 | THERMAL_NO_LIMIT, |
370 | THERMAL_NO_LIMIT, |
371 | THERMAL_WEIGHT_DEFAULT); |
372 | } |
373 | |
374 | static int imx_unbind(struct thermal_zone_device *tz, |
375 | struct thermal_cooling_device *cdev) |
376 | { |
377 | return thermal_zone_unbind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev); |
378 | } |
379 | |
380 | static struct thermal_zone_device_ops imx_tz_ops = { |
381 | .bind = imx_bind, |
382 | .unbind = imx_unbind, |
383 | .get_temp = imx_get_temp, |
384 | .change_mode = imx_change_mode, |
385 | .set_trip_temp = imx_set_trip_temp, |
386 | }; |
387 | |
388 | static int imx_init_calib(struct platform_device *pdev, u32 ocotp_ana1) |
389 | { |
390 | struct imx_thermal_data *data = platform_get_drvdata(pdev); |
391 | int n1; |
392 | u64 temp64; |
393 | |
394 | if (ocotp_ana1 == 0 || ocotp_ana1 == ~0) { |
395 | dev_err(&pdev->dev, "invalid sensor calibration data\n" ); |
396 | return -EINVAL; |
397 | } |
398 | |
399 | /* |
400 | * On i.MX7D, we only use the calibration data at 25C to get the temp, |
401 | * Tmeas = ( Nmeas - n1) + 25; n1 is the fuse value for 25C. |
402 | */ |
403 | if (data->socdata->version == TEMPMON_IMX7D) { |
404 | data->c1 = (ocotp_ana1 >> 9) & 0x1ff; |
405 | return 0; |
406 | } |
407 | |
408 | /* |
409 | * The sensor is calibrated at 25 °C (aka T1) and the value measured |
410 | * (aka N1) at this temperature is provided in bits [31:20] in the |
411 | * i.MX's OCOTP value ANA1. |
412 | * To find the actual temperature T, the following formula has to be used |
413 | * when reading value n from the sensor: |
414 | * |
415 | * T = T1 + (N - N1) / (0.4148468 - 0.0015423 * N1) °C + 3.580661 °C |
416 | * = [T1' - N1 / (0.4148468 - 0.0015423 * N1) °C] + N / (0.4148468 - 0.0015423 * N1) °C |
417 | * = [T1' + N1 / (0.0015423 * N1 - 0.4148468) °C] - N / (0.0015423 * N1 - 0.4148468) °C |
418 | * = c2 - c1 * N |
419 | * |
420 | * with |
421 | * |
422 | * T1' = 28.580661 °C |
423 | * c1 = 1 / (0.0015423 * N1 - 0.4297157) °C |
424 | * c2 = T1' + N1 / (0.0015423 * N1 - 0.4148468) °C |
425 | * = T1' + N1 * c1 |
426 | */ |
427 | n1 = ocotp_ana1 >> 20; |
428 | |
429 | temp64 = 10000000; /* use 10^7 as fixed point constant for values in formula */ |
430 | temp64 *= 1000; /* to get result in °mC */ |
431 | do_div(temp64, 15423 * n1 - 4148468); |
432 | data->c1 = temp64; |
433 | data->c2 = n1 * data->c1 + 28581; |
434 | |
435 | return 0; |
436 | } |
437 | |
438 | static void imx_init_temp_grade(struct platform_device *pdev, u32 ocotp_mem0) |
439 | { |
440 | struct imx_thermal_data *data = platform_get_drvdata(pdev); |
441 | |
442 | /* The maximum die temp is specified by the Temperature Grade */ |
443 | switch ((ocotp_mem0 >> 6) & 0x3) { |
444 | case 0: /* Commercial (0 to 95 °C) */ |
445 | data->temp_grade = "Commercial" ; |
446 | data->temp_max = 95000; |
447 | break; |
448 | case 1: /* Extended Commercial (-20 °C to 105 °C) */ |
449 | data->temp_grade = "Extended Commercial" ; |
450 | data->temp_max = 105000; |
451 | break; |
452 | case 2: /* Industrial (-40 °C to 105 °C) */ |
453 | data->temp_grade = "Industrial" ; |
454 | data->temp_max = 105000; |
455 | break; |
456 | case 3: /* Automotive (-40 °C to 125 °C) */ |
457 | data->temp_grade = "Automotive" ; |
458 | data->temp_max = 125000; |
459 | break; |
460 | } |
461 | |
462 | /* |
463 | * Set the critical trip point at 5 °C under max |
464 | * Set the passive trip point at 10 °C under max (changeable via sysfs) |
465 | */ |
466 | trips[IMX_TRIP_PASSIVE].temperature = data->temp_max - (1000 * 10); |
467 | trips[IMX_TRIP_CRITICAL].temperature = data->temp_max - (1000 * 5); |
468 | } |
469 | |
470 | static int imx_init_from_tempmon_data(struct platform_device *pdev) |
471 | { |
472 | struct regmap *map; |
473 | int ret; |
474 | u32 val; |
475 | |
476 | map = syscon_regmap_lookup_by_phandle(np: pdev->dev.of_node, |
477 | property: "fsl,tempmon-data" ); |
478 | if (IS_ERR(ptr: map)) { |
479 | ret = PTR_ERR(ptr: map); |
480 | dev_err(&pdev->dev, "failed to get sensor regmap: %d\n" , ret); |
481 | return ret; |
482 | } |
483 | |
484 | ret = regmap_read(map, OCOTP_ANA1, val: &val); |
485 | if (ret) { |
486 | dev_err(&pdev->dev, "failed to read sensor data: %d\n" , ret); |
487 | return ret; |
488 | } |
489 | ret = imx_init_calib(pdev, ocotp_ana1: val); |
490 | if (ret) |
491 | return ret; |
492 | |
493 | ret = regmap_read(map, OCOTP_MEM0, val: &val); |
494 | if (ret) { |
495 | dev_err(&pdev->dev, "failed to read sensor data: %d\n" , ret); |
496 | return ret; |
497 | } |
498 | imx_init_temp_grade(pdev, ocotp_mem0: val); |
499 | |
500 | return 0; |
501 | } |
502 | |
503 | static int imx_init_from_nvmem_cells(struct platform_device *pdev) |
504 | { |
505 | int ret; |
506 | u32 val; |
507 | |
508 | ret = nvmem_cell_read_u32(dev: &pdev->dev, cell_id: "calib" , val: &val); |
509 | if (ret) |
510 | return ret; |
511 | |
512 | ret = imx_init_calib(pdev, ocotp_ana1: val); |
513 | if (ret) |
514 | return ret; |
515 | |
516 | ret = nvmem_cell_read_u32(dev: &pdev->dev, cell_id: "temp_grade" , val: &val); |
517 | if (ret) |
518 | return ret; |
519 | imx_init_temp_grade(pdev, ocotp_mem0: val); |
520 | |
521 | return 0; |
522 | } |
523 | |
524 | static irqreturn_t imx_thermal_alarm_irq(int irq, void *dev) |
525 | { |
526 | struct imx_thermal_data *data = dev; |
527 | |
528 | disable_irq_nosync(irq); |
529 | data->irq_enabled = false; |
530 | |
531 | return IRQ_WAKE_THREAD; |
532 | } |
533 | |
534 | static irqreturn_t imx_thermal_alarm_irq_thread(int irq, void *dev) |
535 | { |
536 | struct imx_thermal_data *data = dev; |
537 | |
538 | dev_dbg(data->dev, "THERMAL ALARM: T > %d\n" , data->alarm_temp / 1000); |
539 | |
540 | thermal_zone_device_update(data->tz, THERMAL_EVENT_UNSPECIFIED); |
541 | |
542 | return IRQ_HANDLED; |
543 | } |
544 | |
545 | static const struct of_device_id of_imx_thermal_match[] = { |
546 | { .compatible = "fsl,imx6q-tempmon" , .data = &thermal_imx6q_data, }, |
547 | { .compatible = "fsl,imx6sx-tempmon" , .data = &thermal_imx6sx_data, }, |
548 | { .compatible = "fsl,imx7d-tempmon" , .data = &thermal_imx7d_data, }, |
549 | { /* end */ } |
550 | }; |
551 | MODULE_DEVICE_TABLE(of, of_imx_thermal_match); |
552 | |
553 | #ifdef CONFIG_CPU_FREQ |
554 | /* |
555 | * Create cooling device in case no #cooling-cells property is available in |
556 | * CPU node |
557 | */ |
558 | static int imx_thermal_register_legacy_cooling(struct imx_thermal_data *data) |
559 | { |
560 | struct device_node *np; |
561 | int ret = 0; |
562 | |
563 | data->policy = cpufreq_cpu_get(cpu: 0); |
564 | if (!data->policy) { |
565 | pr_debug("%s: CPUFreq policy not found\n" , __func__); |
566 | return -EPROBE_DEFER; |
567 | } |
568 | |
569 | np = of_get_cpu_node(cpu: data->policy->cpu, NULL); |
570 | |
571 | if (!np || !of_property_present(np, propname: "#cooling-cells" )) { |
572 | data->cdev = cpufreq_cooling_register(policy: data->policy); |
573 | if (IS_ERR(ptr: data->cdev)) { |
574 | ret = PTR_ERR(ptr: data->cdev); |
575 | cpufreq_cpu_put(policy: data->policy); |
576 | } |
577 | } |
578 | |
579 | of_node_put(node: np); |
580 | |
581 | return ret; |
582 | } |
583 | |
584 | static void imx_thermal_unregister_legacy_cooling(struct imx_thermal_data *data) |
585 | { |
586 | cpufreq_cooling_unregister(cdev: data->cdev); |
587 | cpufreq_cpu_put(policy: data->policy); |
588 | } |
589 | |
590 | #else |
591 | |
592 | static inline int imx_thermal_register_legacy_cooling(struct imx_thermal_data *data) |
593 | { |
594 | return 0; |
595 | } |
596 | |
597 | static inline void imx_thermal_unregister_legacy_cooling(struct imx_thermal_data *data) |
598 | { |
599 | } |
600 | #endif |
601 | |
602 | static int imx_thermal_probe(struct platform_device *pdev) |
603 | { |
604 | struct imx_thermal_data *data; |
605 | struct regmap *map; |
606 | int measure_freq; |
607 | int ret; |
608 | |
609 | data = devm_kzalloc(dev: &pdev->dev, size: sizeof(*data), GFP_KERNEL); |
610 | if (!data) |
611 | return -ENOMEM; |
612 | |
613 | data->dev = &pdev->dev; |
614 | |
615 | map = syscon_regmap_lookup_by_phandle(np: pdev->dev.of_node, property: "fsl,tempmon" ); |
616 | if (IS_ERR(ptr: map)) { |
617 | ret = PTR_ERR(ptr: map); |
618 | dev_err(&pdev->dev, "failed to get tempmon regmap: %d\n" , ret); |
619 | return ret; |
620 | } |
621 | data->tempmon = map; |
622 | |
623 | data->socdata = of_device_get_match_data(dev: &pdev->dev); |
624 | if (!data->socdata) { |
625 | dev_err(&pdev->dev, "no device match found\n" ); |
626 | return -ENODEV; |
627 | } |
628 | |
629 | /* make sure the IRQ flag is clear before enabling irq on i.MX6SX */ |
630 | if (data->socdata->version == TEMPMON_IMX6SX) { |
631 | regmap_write(map, IMX6_MISC1 + REG_CLR, |
632 | IMX6_MISC1_IRQ_TEMPHIGH | IMX6_MISC1_IRQ_TEMPLOW |
633 | | IMX6_MISC1_IRQ_TEMPPANIC); |
634 | /* |
635 | * reset value of LOW ALARM is incorrect, set it to lowest |
636 | * value to avoid false trigger of low alarm. |
637 | */ |
638 | regmap_write(map, reg: data->socdata->low_alarm_ctrl + REG_SET, |
639 | val: data->socdata->low_alarm_mask); |
640 | } |
641 | |
642 | data->irq = platform_get_irq(pdev, 0); |
643 | if (data->irq < 0) |
644 | return data->irq; |
645 | |
646 | platform_set_drvdata(pdev, data); |
647 | |
648 | if (of_property_present(np: pdev->dev.of_node, propname: "nvmem-cells" )) { |
649 | ret = imx_init_from_nvmem_cells(pdev); |
650 | if (ret) |
651 | return dev_err_probe(dev: &pdev->dev, err: ret, |
652 | fmt: "failed to init from nvmem\n" ); |
653 | } else { |
654 | ret = imx_init_from_tempmon_data(pdev); |
655 | if (ret) { |
656 | dev_err(&pdev->dev, "failed to init from fsl,tempmon-data\n" ); |
657 | return ret; |
658 | } |
659 | } |
660 | |
661 | /* Make sure sensor is in known good state for measurements */ |
662 | regmap_write(map, reg: data->socdata->sensor_ctrl + REG_CLR, |
663 | val: data->socdata->power_down_mask); |
664 | regmap_write(map, reg: data->socdata->sensor_ctrl + REG_CLR, |
665 | val: data->socdata->measure_temp_mask); |
666 | regmap_write(map, reg: data->socdata->measure_freq_ctrl + REG_CLR, |
667 | val: data->socdata->measure_freq_mask); |
668 | if (data->socdata->version != TEMPMON_IMX7D) |
669 | regmap_write(map, IMX6_MISC0 + REG_SET, |
670 | IMX6_MISC0_REFTOP_SELBIASOFF); |
671 | regmap_write(map, reg: data->socdata->sensor_ctrl + REG_SET, |
672 | val: data->socdata->power_down_mask); |
673 | |
674 | ret = imx_thermal_register_legacy_cooling(data); |
675 | if (ret) |
676 | return dev_err_probe(dev: &pdev->dev, err: ret, |
677 | fmt: "failed to register cpufreq cooling device\n" ); |
678 | |
679 | data->thermal_clk = devm_clk_get(dev: &pdev->dev, NULL); |
680 | if (IS_ERR(ptr: data->thermal_clk)) { |
681 | ret = PTR_ERR(ptr: data->thermal_clk); |
682 | if (ret != -EPROBE_DEFER) |
683 | dev_err(&pdev->dev, |
684 | "failed to get thermal clk: %d\n" , ret); |
685 | goto legacy_cleanup; |
686 | } |
687 | |
688 | /* |
689 | * Thermal sensor needs clk on to get correct value, normally |
690 | * we should enable its clk before taking measurement and disable |
691 | * clk after measurement is done, but if alarm function is enabled, |
692 | * hardware will auto measure the temperature periodically, so we |
693 | * need to keep the clk always on for alarm function. |
694 | */ |
695 | ret = clk_prepare_enable(clk: data->thermal_clk); |
696 | if (ret) { |
697 | dev_err(&pdev->dev, "failed to enable thermal clk: %d\n" , ret); |
698 | goto legacy_cleanup; |
699 | } |
700 | |
701 | data->tz = thermal_zone_device_register_with_trips(type: "imx_thermal_zone" , |
702 | trips, |
703 | ARRAY_SIZE(trips), |
704 | devdata: data, |
705 | ops: &imx_tz_ops, NULL, |
706 | IMX_PASSIVE_DELAY, |
707 | IMX_POLLING_DELAY); |
708 | if (IS_ERR(ptr: data->tz)) { |
709 | ret = PTR_ERR(ptr: data->tz); |
710 | dev_err(&pdev->dev, |
711 | "failed to register thermal zone device %d\n" , ret); |
712 | goto clk_disable; |
713 | } |
714 | |
715 | dev_info(&pdev->dev, "%s CPU temperature grade - max:%dC" |
716 | " critical:%dC passive:%dC\n" , data->temp_grade, |
717 | data->temp_max / 1000, trips[IMX_TRIP_CRITICAL].temperature / 1000, |
718 | trips[IMX_TRIP_PASSIVE].temperature / 1000); |
719 | |
720 | /* Enable measurements at ~ 10 Hz */ |
721 | regmap_write(map, reg: data->socdata->measure_freq_ctrl + REG_CLR, |
722 | val: data->socdata->measure_freq_mask); |
723 | measure_freq = DIV_ROUND_UP(32768, 10); /* 10 Hz */ |
724 | regmap_write(map, reg: data->socdata->measure_freq_ctrl + REG_SET, |
725 | val: measure_freq << data->socdata->measure_freq_shift); |
726 | imx_set_alarm_temp(data, alarm_temp: trips[IMX_TRIP_PASSIVE].temperature); |
727 | |
728 | if (data->socdata->version == TEMPMON_IMX6SX) |
729 | imx_set_panic_temp(data, panic_temp: trips[IMX_TRIP_CRITICAL].temperature); |
730 | |
731 | regmap_write(map, reg: data->socdata->sensor_ctrl + REG_CLR, |
732 | val: data->socdata->power_down_mask); |
733 | regmap_write(map, reg: data->socdata->sensor_ctrl + REG_SET, |
734 | val: data->socdata->measure_temp_mask); |
735 | /* After power up, we need a delay before first access can be done. */ |
736 | usleep_range(min: 20, max: 50); |
737 | |
738 | /* the core was configured and enabled just before */ |
739 | pm_runtime_set_active(dev: &pdev->dev); |
740 | pm_runtime_enable(dev: data->dev); |
741 | |
742 | ret = pm_runtime_resume_and_get(dev: data->dev); |
743 | if (ret < 0) |
744 | goto disable_runtime_pm; |
745 | |
746 | data->irq_enabled = true; |
747 | ret = thermal_zone_device_enable(tz: data->tz); |
748 | if (ret) |
749 | goto thermal_zone_unregister; |
750 | |
751 | ret = devm_request_threaded_irq(dev: &pdev->dev, irq: data->irq, |
752 | handler: imx_thermal_alarm_irq, thread_fn: imx_thermal_alarm_irq_thread, |
753 | irqflags: 0, devname: "imx_thermal" , dev_id: data); |
754 | if (ret < 0) { |
755 | dev_err(&pdev->dev, "failed to request alarm irq: %d\n" , ret); |
756 | goto thermal_zone_unregister; |
757 | } |
758 | |
759 | pm_runtime_put(dev: data->dev); |
760 | |
761 | return 0; |
762 | |
763 | thermal_zone_unregister: |
764 | thermal_zone_device_unregister(tz: data->tz); |
765 | disable_runtime_pm: |
766 | pm_runtime_put_noidle(dev: data->dev); |
767 | pm_runtime_disable(dev: data->dev); |
768 | clk_disable: |
769 | clk_disable_unprepare(clk: data->thermal_clk); |
770 | legacy_cleanup: |
771 | imx_thermal_unregister_legacy_cooling(data); |
772 | |
773 | return ret; |
774 | } |
775 | |
776 | static void imx_thermal_remove(struct platform_device *pdev) |
777 | { |
778 | struct imx_thermal_data *data = platform_get_drvdata(pdev); |
779 | |
780 | pm_runtime_put_noidle(dev: data->dev); |
781 | pm_runtime_disable(dev: data->dev); |
782 | |
783 | thermal_zone_device_unregister(tz: data->tz); |
784 | imx_thermal_unregister_legacy_cooling(data); |
785 | } |
786 | |
787 | static int __maybe_unused imx_thermal_suspend(struct device *dev) |
788 | { |
789 | struct imx_thermal_data *data = dev_get_drvdata(dev); |
790 | int ret; |
791 | |
792 | /* |
793 | * Need to disable thermal sensor, otherwise, when thermal core |
794 | * try to get temperature before thermal sensor resume, a wrong |
795 | * temperature will be read as the thermal sensor is powered |
796 | * down. This is done in change_mode() operation called from |
797 | * thermal_zone_device_disable() |
798 | */ |
799 | ret = thermal_zone_device_disable(tz: data->tz); |
800 | if (ret) |
801 | return ret; |
802 | |
803 | return pm_runtime_force_suspend(dev: data->dev); |
804 | } |
805 | |
806 | static int __maybe_unused imx_thermal_resume(struct device *dev) |
807 | { |
808 | struct imx_thermal_data *data = dev_get_drvdata(dev); |
809 | int ret; |
810 | |
811 | ret = pm_runtime_force_resume(dev: data->dev); |
812 | if (ret) |
813 | return ret; |
814 | /* Enabled thermal sensor after resume */ |
815 | return thermal_zone_device_enable(tz: data->tz); |
816 | } |
817 | |
818 | static int __maybe_unused imx_thermal_runtime_suspend(struct device *dev) |
819 | { |
820 | struct imx_thermal_data *data = dev_get_drvdata(dev); |
821 | const struct thermal_soc_data *socdata = data->socdata; |
822 | struct regmap *map = data->tempmon; |
823 | int ret; |
824 | |
825 | ret = regmap_write(map, reg: socdata->sensor_ctrl + REG_CLR, |
826 | val: socdata->measure_temp_mask); |
827 | if (ret) |
828 | return ret; |
829 | |
830 | ret = regmap_write(map, reg: socdata->sensor_ctrl + REG_SET, |
831 | val: socdata->power_down_mask); |
832 | if (ret) |
833 | return ret; |
834 | |
835 | clk_disable_unprepare(clk: data->thermal_clk); |
836 | |
837 | return 0; |
838 | } |
839 | |
840 | static int __maybe_unused imx_thermal_runtime_resume(struct device *dev) |
841 | { |
842 | struct imx_thermal_data *data = dev_get_drvdata(dev); |
843 | const struct thermal_soc_data *socdata = data->socdata; |
844 | struct regmap *map = data->tempmon; |
845 | int ret; |
846 | |
847 | ret = clk_prepare_enable(clk: data->thermal_clk); |
848 | if (ret) |
849 | return ret; |
850 | |
851 | ret = regmap_write(map, reg: socdata->sensor_ctrl + REG_CLR, |
852 | val: socdata->power_down_mask); |
853 | if (ret) |
854 | return ret; |
855 | |
856 | ret = regmap_write(map, reg: socdata->sensor_ctrl + REG_SET, |
857 | val: socdata->measure_temp_mask); |
858 | if (ret) |
859 | return ret; |
860 | |
861 | /* |
862 | * According to the temp sensor designers, it may require up to ~17us |
863 | * to complete a measurement. |
864 | */ |
865 | usleep_range(min: 20, max: 50); |
866 | |
867 | return 0; |
868 | } |
869 | |
870 | static const struct dev_pm_ops imx_thermal_pm_ops = { |
871 | SET_SYSTEM_SLEEP_PM_OPS(imx_thermal_suspend, imx_thermal_resume) |
872 | SET_RUNTIME_PM_OPS(imx_thermal_runtime_suspend, |
873 | imx_thermal_runtime_resume, NULL) |
874 | }; |
875 | |
876 | static struct platform_driver imx_thermal = { |
877 | .driver = { |
878 | .name = "imx_thermal" , |
879 | .pm = &imx_thermal_pm_ops, |
880 | .of_match_table = of_imx_thermal_match, |
881 | }, |
882 | .probe = imx_thermal_probe, |
883 | .remove_new = imx_thermal_remove, |
884 | }; |
885 | module_platform_driver(imx_thermal); |
886 | |
887 | MODULE_AUTHOR("Freescale Semiconductor, Inc." ); |
888 | MODULE_DESCRIPTION("Thermal driver for Freescale i.MX SoCs" ); |
889 | MODULE_LICENSE("GPL v2" ); |
890 | MODULE_ALIAS("platform:imx-thermal" ); |
891 | |