imx_thermal.c 25 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490491492493494495496497498499500501502503504505506507508509510511512513514515516517518519520521522523524525526527528529530531532533534535536537538539540541542543544545546547548549550551552553554555556557558559560561562563564565566567568569570571572573574575576577578579580581582583584585586587588589590591592593594595596597598599600601602603604605606607608609610611612613614615616617618619620621622623624625626627628629630631632633634635636637638639640641642643644645646647648649650651652653654655656657658659660661662663664665666667668669670671672673674675676677678679680681682683684685686687688689690691692693694695696697698699700701702703704705706707708709710711712713714715716717718719720721722723724725726727728729730731732733734735736737738739740741742743744745746747748749750751752753754755756757758759760761762763764765766767768769770771772773774775776777778779780781782783784785786787788789790791792793794795796797798799800801802803804805806807808809810811812813814815816817818819820821822823824825826827828829830831832833834835836837838839840841842843844845846847848849850851852853854855856857858859860861862863864865866867868869870871872873874875876877878879880881882883884885886887888889890891892893894895896897898899900901902903904905906907908909910911912913914915916917918919920921922923924925926927928929930931932933934935936
  1. // SPDX-License-Identifier: GPL-2.0
  2. //
  3. // Copyright 2013 Freescale Semiconductor, Inc.
  4. #include <linux/clk.h>
  5. #include <linux/cpufreq.h>
  6. #include <linux/cpu_cooling.h>
  7. #include <linux/delay.h>
  8. #include <linux/interrupt.h>
  9. #include <linux/io.h>
  10. #include <linux/mfd/syscon.h>
  11. #include <linux/module.h>
  12. #include <linux/of.h>
  13. #include <linux/of_device.h>
  14. #include <linux/regmap.h>
  15. #include <linux/thermal.h>
  16. #include <linux/nvmem-consumer.h>
  17. #include <linux/pm_runtime.h>
  18. #define REG_SET 0x4
  19. #define REG_CLR 0x8
  20. #define REG_TOG 0xc
  21. /* i.MX6 specific */
  22. #define IMX6_MISC0 0x0150
  23. #define IMX6_MISC0_REFTOP_SELBIASOFF (1 << 3)
  24. #define IMX6_MISC1 0x0160
  25. #define IMX6_MISC1_IRQ_TEMPHIGH (1 << 29)
  26. /* Below LOW and PANIC bits are only for TEMPMON_IMX6SX */
  27. #define IMX6_MISC1_IRQ_TEMPLOW (1 << 28)
  28. #define IMX6_MISC1_IRQ_TEMPPANIC (1 << 27)
  29. #define IMX6_TEMPSENSE0 0x0180
  30. #define IMX6_TEMPSENSE0_ALARM_VALUE_SHIFT 20
  31. #define IMX6_TEMPSENSE0_ALARM_VALUE_MASK (0xfff << 20)
  32. #define IMX6_TEMPSENSE0_TEMP_CNT_SHIFT 8
  33. #define IMX6_TEMPSENSE0_TEMP_CNT_MASK (0xfff << 8)
  34. #define IMX6_TEMPSENSE0_FINISHED (1 << 2)
  35. #define IMX6_TEMPSENSE0_MEASURE_TEMP (1 << 1)
  36. #define IMX6_TEMPSENSE0_POWER_DOWN (1 << 0)
  37. #define IMX6_TEMPSENSE1 0x0190
  38. #define IMX6_TEMPSENSE1_MEASURE_FREQ 0xffff
  39. #define IMX6_TEMPSENSE1_MEASURE_FREQ_SHIFT 0
  40. #define OCOTP_MEM0 0x0480
  41. #define OCOTP_ANA1 0x04e0
  42. /* Below TEMPSENSE2 is only for TEMPMON_IMX6SX */
  43. #define IMX6_TEMPSENSE2 0x0290
  44. #define IMX6_TEMPSENSE2_LOW_VALUE_SHIFT 0
  45. #define IMX6_TEMPSENSE2_LOW_VALUE_MASK 0xfff
  46. #define IMX6_TEMPSENSE2_PANIC_VALUE_SHIFT 16
  47. #define IMX6_TEMPSENSE2_PANIC_VALUE_MASK 0xfff0000
  48. /* i.MX7 specific */
  49. #define IMX7_ANADIG_DIGPROG 0x800
  50. #define IMX7_TEMPSENSE0 0x300
  51. #define IMX7_TEMPSENSE0_PANIC_ALARM_SHIFT 18
  52. #define IMX7_TEMPSENSE0_PANIC_ALARM_MASK (0x1ff << 18)
  53. #define IMX7_TEMPSENSE0_HIGH_ALARM_SHIFT 9
  54. #define IMX7_TEMPSENSE0_HIGH_ALARM_MASK (0x1ff << 9)
  55. #define IMX7_TEMPSENSE0_LOW_ALARM_SHIFT 0
  56. #define IMX7_TEMPSENSE0_LOW_ALARM_MASK 0x1ff
  57. #define IMX7_TEMPSENSE1 0x310
  58. #define IMX7_TEMPSENSE1_MEASURE_FREQ_SHIFT 16
  59. #define IMX7_TEMPSENSE1_MEASURE_FREQ_MASK (0xffff << 16)
  60. #define IMX7_TEMPSENSE1_FINISHED (1 << 11)
  61. #define IMX7_TEMPSENSE1_MEASURE_TEMP (1 << 10)
  62. #define IMX7_TEMPSENSE1_POWER_DOWN (1 << 9)
  63. #define IMX7_TEMPSENSE1_TEMP_VALUE_SHIFT 0
  64. #define IMX7_TEMPSENSE1_TEMP_VALUE_MASK 0x1ff
  65. /* The driver supports 1 passive trip point and 1 critical trip point */
  66. enum imx_thermal_trip {
  67. IMX_TRIP_PASSIVE,
  68. IMX_TRIP_CRITICAL,
  69. IMX_TRIP_NUM,
  70. };
  71. #define IMX_POLLING_DELAY 2000 /* millisecond */
  72. #define IMX_PASSIVE_DELAY 1000
  73. #define TEMPMON_IMX6Q 1
  74. #define TEMPMON_IMX6SX 2
  75. #define TEMPMON_IMX7D 3
  76. struct thermal_soc_data {
  77. u32 version;
  78. u32 sensor_ctrl;
  79. u32 power_down_mask;
  80. u32 measure_temp_mask;
  81. u32 measure_freq_ctrl;
  82. u32 measure_freq_mask;
  83. u32 measure_freq_shift;
  84. u32 temp_data;
  85. u32 temp_value_mask;
  86. u32 temp_value_shift;
  87. u32 temp_valid_mask;
  88. u32 panic_alarm_ctrl;
  89. u32 panic_alarm_mask;
  90. u32 panic_alarm_shift;
  91. u32 high_alarm_ctrl;
  92. u32 high_alarm_mask;
  93. u32 high_alarm_shift;
  94. u32 low_alarm_ctrl;
  95. u32 low_alarm_mask;
  96. u32 low_alarm_shift;
  97. };
  98. static struct thermal_soc_data thermal_imx6q_data = {
  99. .version = TEMPMON_IMX6Q,
  100. .sensor_ctrl = IMX6_TEMPSENSE0,
  101. .power_down_mask = IMX6_TEMPSENSE0_POWER_DOWN,
  102. .measure_temp_mask = IMX6_TEMPSENSE0_MEASURE_TEMP,
  103. .measure_freq_ctrl = IMX6_TEMPSENSE1,
  104. .measure_freq_shift = IMX6_TEMPSENSE1_MEASURE_FREQ_SHIFT,
  105. .measure_freq_mask = IMX6_TEMPSENSE1_MEASURE_FREQ,
  106. .temp_data = IMX6_TEMPSENSE0,
  107. .temp_value_mask = IMX6_TEMPSENSE0_TEMP_CNT_MASK,
  108. .temp_value_shift = IMX6_TEMPSENSE0_TEMP_CNT_SHIFT,
  109. .temp_valid_mask = IMX6_TEMPSENSE0_FINISHED,
  110. .high_alarm_ctrl = IMX6_TEMPSENSE0,
  111. .high_alarm_mask = IMX6_TEMPSENSE0_ALARM_VALUE_MASK,
  112. .high_alarm_shift = IMX6_TEMPSENSE0_ALARM_VALUE_SHIFT,
  113. };
  114. static struct thermal_soc_data thermal_imx6sx_data = {
  115. .version = TEMPMON_IMX6SX,
  116. .sensor_ctrl = IMX6_TEMPSENSE0,
  117. .power_down_mask = IMX6_TEMPSENSE0_POWER_DOWN,
  118. .measure_temp_mask = IMX6_TEMPSENSE0_MEASURE_TEMP,
  119. .measure_freq_ctrl = IMX6_TEMPSENSE1,
  120. .measure_freq_shift = IMX6_TEMPSENSE1_MEASURE_FREQ_SHIFT,
  121. .measure_freq_mask = IMX6_TEMPSENSE1_MEASURE_FREQ,
  122. .temp_data = IMX6_TEMPSENSE0,
  123. .temp_value_mask = IMX6_TEMPSENSE0_TEMP_CNT_MASK,
  124. .temp_value_shift = IMX6_TEMPSENSE0_TEMP_CNT_SHIFT,
  125. .temp_valid_mask = IMX6_TEMPSENSE0_FINISHED,
  126. .high_alarm_ctrl = IMX6_TEMPSENSE0,
  127. .high_alarm_mask = IMX6_TEMPSENSE0_ALARM_VALUE_MASK,
  128. .high_alarm_shift = IMX6_TEMPSENSE0_ALARM_VALUE_SHIFT,
  129. .panic_alarm_ctrl = IMX6_TEMPSENSE2,
  130. .panic_alarm_mask = IMX6_TEMPSENSE2_PANIC_VALUE_MASK,
  131. .panic_alarm_shift = IMX6_TEMPSENSE2_PANIC_VALUE_SHIFT,
  132. .low_alarm_ctrl = IMX6_TEMPSENSE2,
  133. .low_alarm_mask = IMX6_TEMPSENSE2_LOW_VALUE_MASK,
  134. .low_alarm_shift = IMX6_TEMPSENSE2_LOW_VALUE_SHIFT,
  135. };
  136. static struct thermal_soc_data thermal_imx7d_data = {
  137. .version = TEMPMON_IMX7D,
  138. .sensor_ctrl = IMX7_TEMPSENSE1,
  139. .power_down_mask = IMX7_TEMPSENSE1_POWER_DOWN,
  140. .measure_temp_mask = IMX7_TEMPSENSE1_MEASURE_TEMP,
  141. .measure_freq_ctrl = IMX7_TEMPSENSE1,
  142. .measure_freq_shift = IMX7_TEMPSENSE1_MEASURE_FREQ_SHIFT,
  143. .measure_freq_mask = IMX7_TEMPSENSE1_MEASURE_FREQ_MASK,
  144. .temp_data = IMX7_TEMPSENSE1,
  145. .temp_value_mask = IMX7_TEMPSENSE1_TEMP_VALUE_MASK,
  146. .temp_value_shift = IMX7_TEMPSENSE1_TEMP_VALUE_SHIFT,
  147. .temp_valid_mask = IMX7_TEMPSENSE1_FINISHED,
  148. .panic_alarm_ctrl = IMX7_TEMPSENSE1,
  149. .panic_alarm_mask = IMX7_TEMPSENSE0_PANIC_ALARM_MASK,
  150. .panic_alarm_shift = IMX7_TEMPSENSE0_PANIC_ALARM_SHIFT,
  151. .high_alarm_ctrl = IMX7_TEMPSENSE0,
  152. .high_alarm_mask = IMX7_TEMPSENSE0_HIGH_ALARM_MASK,
  153. .high_alarm_shift = IMX7_TEMPSENSE0_HIGH_ALARM_SHIFT,
  154. .low_alarm_ctrl = IMX7_TEMPSENSE0,
  155. .low_alarm_mask = IMX7_TEMPSENSE0_LOW_ALARM_MASK,
  156. .low_alarm_shift = IMX7_TEMPSENSE0_LOW_ALARM_SHIFT,
  157. };
  158. struct imx_thermal_data {
  159. struct device *dev;
  160. struct cpufreq_policy *policy;
  161. struct thermal_zone_device *tz;
  162. struct thermal_cooling_device *cdev;
  163. struct regmap *tempmon;
  164. u32 c1, c2; /* See formula in imx_init_calib() */
  165. int temp_passive;
  166. int temp_critical;
  167. int temp_max;
  168. int alarm_temp;
  169. int last_temp;
  170. bool irq_enabled;
  171. int irq;
  172. struct clk *thermal_clk;
  173. const struct thermal_soc_data *socdata;
  174. const char *temp_grade;
  175. };
  176. static void imx_set_panic_temp(struct imx_thermal_data *data,
  177. int panic_temp)
  178. {
  179. const struct thermal_soc_data *soc_data = data->socdata;
  180. struct regmap *map = data->tempmon;
  181. int critical_value;
  182. critical_value = (data->c2 - panic_temp) / data->c1;
  183. regmap_write(map, soc_data->panic_alarm_ctrl + REG_CLR,
  184. soc_data->panic_alarm_mask);
  185. regmap_write(map, soc_data->panic_alarm_ctrl + REG_SET,
  186. critical_value << soc_data->panic_alarm_shift);
  187. }
  188. static void imx_set_alarm_temp(struct imx_thermal_data *data,
  189. int alarm_temp)
  190. {
  191. struct regmap *map = data->tempmon;
  192. const struct thermal_soc_data *soc_data = data->socdata;
  193. int alarm_value;
  194. data->alarm_temp = alarm_temp;
  195. if (data->socdata->version == TEMPMON_IMX7D)
  196. alarm_value = alarm_temp / 1000 + data->c1 - 25;
  197. else
  198. alarm_value = (data->c2 - alarm_temp) / data->c1;
  199. regmap_write(map, soc_data->high_alarm_ctrl + REG_CLR,
  200. soc_data->high_alarm_mask);
  201. regmap_write(map, soc_data->high_alarm_ctrl + REG_SET,
  202. alarm_value << soc_data->high_alarm_shift);
  203. }
  204. static int imx_get_temp(struct thermal_zone_device *tz, int *temp)
  205. {
  206. struct imx_thermal_data *data = tz->devdata;
  207. const struct thermal_soc_data *soc_data = data->socdata;
  208. struct regmap *map = data->tempmon;
  209. unsigned int n_meas;
  210. u32 val;
  211. int ret;
  212. ret = pm_runtime_resume_and_get(data->dev);
  213. if (ret < 0)
  214. return ret;
  215. regmap_read(map, soc_data->temp_data, &val);
  216. if ((val & soc_data->temp_valid_mask) == 0) {
  217. dev_dbg(&tz->device, "temp measurement never finished\n");
  218. return -EAGAIN;
  219. }
  220. n_meas = (val & soc_data->temp_value_mask)
  221. >> soc_data->temp_value_shift;
  222. /* See imx_init_calib() for formula derivation */
  223. if (data->socdata->version == TEMPMON_IMX7D)
  224. *temp = (n_meas - data->c1 + 25) * 1000;
  225. else
  226. *temp = data->c2 - n_meas * data->c1;
  227. /* Update alarm value to next higher trip point for TEMPMON_IMX6Q */
  228. if (data->socdata->version == TEMPMON_IMX6Q) {
  229. if (data->alarm_temp == data->temp_passive &&
  230. *temp >= data->temp_passive)
  231. imx_set_alarm_temp(data, data->temp_critical);
  232. if (data->alarm_temp == data->temp_critical &&
  233. *temp < data->temp_passive) {
  234. imx_set_alarm_temp(data, data->temp_passive);
  235. dev_dbg(&tz->device, "thermal alarm off: T < %d\n",
  236. data->alarm_temp / 1000);
  237. }
  238. }
  239. if (*temp != data->last_temp) {
  240. dev_dbg(&tz->device, "millicelsius: %d\n", *temp);
  241. data->last_temp = *temp;
  242. }
  243. /* Reenable alarm IRQ if temperature below alarm temperature */
  244. if (!data->irq_enabled && *temp < data->alarm_temp) {
  245. data->irq_enabled = true;
  246. enable_irq(data->irq);
  247. }
  248. pm_runtime_put(data->dev);
  249. return 0;
  250. }
  251. static int imx_change_mode(struct thermal_zone_device *tz,
  252. enum thermal_device_mode mode)
  253. {
  254. struct imx_thermal_data *data = tz->devdata;
  255. if (mode == THERMAL_DEVICE_ENABLED) {
  256. pm_runtime_get(data->dev);
  257. if (!data->irq_enabled) {
  258. data->irq_enabled = true;
  259. enable_irq(data->irq);
  260. }
  261. } else {
  262. pm_runtime_put(data->dev);
  263. if (data->irq_enabled) {
  264. disable_irq(data->irq);
  265. data->irq_enabled = false;
  266. }
  267. }
  268. return 0;
  269. }
  270. static int imx_get_trip_type(struct thermal_zone_device *tz, int trip,
  271. enum thermal_trip_type *type)
  272. {
  273. *type = (trip == IMX_TRIP_PASSIVE) ? THERMAL_TRIP_PASSIVE :
  274. THERMAL_TRIP_CRITICAL;
  275. return 0;
  276. }
  277. static int imx_get_crit_temp(struct thermal_zone_device *tz, int *temp)
  278. {
  279. struct imx_thermal_data *data = tz->devdata;
  280. *temp = data->temp_critical;
  281. return 0;
  282. }
  283. static int imx_get_trip_temp(struct thermal_zone_device *tz, int trip,
  284. int *temp)
  285. {
  286. struct imx_thermal_data *data = tz->devdata;
  287. *temp = (trip == IMX_TRIP_PASSIVE) ? data->temp_passive :
  288. data->temp_critical;
  289. return 0;
  290. }
  291. static int imx_set_trip_temp(struct thermal_zone_device *tz, int trip,
  292. int temp)
  293. {
  294. struct imx_thermal_data *data = tz->devdata;
  295. int ret;
  296. ret = pm_runtime_resume_and_get(data->dev);
  297. if (ret < 0)
  298. return ret;
  299. /* do not allow changing critical threshold */
  300. if (trip == IMX_TRIP_CRITICAL)
  301. return -EPERM;
  302. /* do not allow passive to be set higher than critical */
  303. if (temp < 0 || temp > data->temp_critical)
  304. return -EINVAL;
  305. data->temp_passive = temp;
  306. imx_set_alarm_temp(data, temp);
  307. pm_runtime_put(data->dev);
  308. return 0;
  309. }
  310. static int imx_bind(struct thermal_zone_device *tz,
  311. struct thermal_cooling_device *cdev)
  312. {
  313. int ret;
  314. ret = thermal_zone_bind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev,
  315. THERMAL_NO_LIMIT,
  316. THERMAL_NO_LIMIT,
  317. THERMAL_WEIGHT_DEFAULT);
  318. if (ret) {
  319. dev_err(&tz->device,
  320. "binding zone %s with cdev %s failed:%d\n",
  321. tz->type, cdev->type, ret);
  322. return ret;
  323. }
  324. return 0;
  325. }
  326. static int imx_unbind(struct thermal_zone_device *tz,
  327. struct thermal_cooling_device *cdev)
  328. {
  329. int ret;
  330. ret = thermal_zone_unbind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev);
  331. if (ret) {
  332. dev_err(&tz->device,
  333. "unbinding zone %s with cdev %s failed:%d\n",
  334. tz->type, cdev->type, ret);
  335. return ret;
  336. }
  337. return 0;
  338. }
  339. static struct thermal_zone_device_ops imx_tz_ops = {
  340. .bind = imx_bind,
  341. .unbind = imx_unbind,
  342. .get_temp = imx_get_temp,
  343. .change_mode = imx_change_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,
  347. .set_trip_temp = imx_set_trip_temp,
  348. };
  349. static int imx_init_calib(struct platform_device *pdev, u32 ocotp_ana1)
  350. {
  351. struct imx_thermal_data *data = platform_get_drvdata(pdev);
  352. int n1;
  353. u64 temp64;
  354. if (ocotp_ana1 == 0 || ocotp_ana1 == ~0) {
  355. dev_err(&pdev->dev, "invalid sensor calibration data\n");
  356. return -EINVAL;
  357. }
  358. /*
  359. * On i.MX7D, we only use the calibration data at 25C to get the temp,
  360. * Tmeas = ( Nmeas - n1) + 25; n1 is the fuse value for 25C.
  361. */
  362. if (data->socdata->version == TEMPMON_IMX7D) {
  363. data->c1 = (ocotp_ana1 >> 9) & 0x1ff;
  364. return 0;
  365. }
  366. /*
  367. * The sensor is calibrated at 25 °C (aka T1) and the value measured
  368. * (aka N1) at this temperature is provided in bits [31:20] in the
  369. * i.MX's OCOTP value ANA1.
  370. * To find the actual temperature T, the following formula has to be used
  371. * when reading value n from the sensor:
  372. *
  373. * T = T1 + (N - N1) / (0.4148468 - 0.0015423 * N1) °C + 3.580661 °C
  374. * = [T1' - N1 / (0.4148468 - 0.0015423 * N1) °C] + N / (0.4148468 - 0.0015423 * N1) °C
  375. * = [T1' + N1 / (0.0015423 * N1 - 0.4148468) °C] - N / (0.0015423 * N1 - 0.4148468) °C
  376. * = c2 - c1 * N
  377. *
  378. * with
  379. *
  380. * T1' = 28.580661 °C
  381. * c1 = 1 / (0.0015423 * N1 - 0.4297157) °C
  382. * c2 = T1' + N1 / (0.0015423 * N1 - 0.4148468) °C
  383. * = T1' + N1 * c1
  384. */
  385. n1 = ocotp_ana1 >> 20;
  386. temp64 = 10000000; /* use 10^7 as fixed point constant for values in formula */
  387. temp64 *= 1000; /* to get result in °mC */
  388. do_div(temp64, 15423 * n1 - 4148468);
  389. data->c1 = temp64;
  390. data->c2 = n1 * data->c1 + 28581;
  391. return 0;
  392. }
  393. static void imx_init_temp_grade(struct platform_device *pdev, u32 ocotp_mem0)
  394. {
  395. struct imx_thermal_data *data = platform_get_drvdata(pdev);
  396. /* The maximum die temp is specified by the Temperature Grade */
  397. switch ((ocotp_mem0 >> 6) & 0x3) {
  398. case 0: /* Commercial (0 to 95 °C) */
  399. data->temp_grade = "Commercial";
  400. data->temp_max = 95000;
  401. break;
  402. case 1: /* Extended Commercial (-20 °C to 105 °C) */
  403. data->temp_grade = "Extended Commercial";
  404. data->temp_max = 105000;
  405. break;
  406. case 2: /* Industrial (-40 °C to 105 °C) */
  407. data->temp_grade = "Industrial";
  408. data->temp_max = 105000;
  409. break;
  410. case 3: /* Automotive (-40 °C to 125 °C) */
  411. data->temp_grade = "Automotive";
  412. data->temp_max = 125000;
  413. break;
  414. }
  415. /*
  416. * Set the critical trip point at 5 °C under max
  417. * Set the passive trip point at 10 °C under max (changeable via sysfs)
  418. */
  419. data->temp_critical = data->temp_max - (1000 * 5);
  420. data->temp_passive = data->temp_max - (1000 * 10);
  421. }
  422. static int imx_init_from_tempmon_data(struct platform_device *pdev)
  423. {
  424. struct regmap *map;
  425. int ret;
  426. u32 val;
  427. map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
  428. "fsl,tempmon-data");
  429. if (IS_ERR(map)) {
  430. ret = PTR_ERR(map);
  431. dev_err(&pdev->dev, "failed to get sensor regmap: %d\n", ret);
  432. return ret;
  433. }
  434. ret = regmap_read(map, OCOTP_ANA1, &val);
  435. if (ret) {
  436. dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret);
  437. return ret;
  438. }
  439. ret = imx_init_calib(pdev, val);
  440. if (ret)
  441. return ret;
  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. return 0;
  449. }
  450. static int imx_init_from_nvmem_cells(struct platform_device *pdev)
  451. {
  452. int ret;
  453. u32 val;
  454. ret = nvmem_cell_read_u32(&pdev->dev, "calib", &val);
  455. if (ret)
  456. return ret;
  457. ret = imx_init_calib(pdev, val);
  458. if (ret)
  459. return ret;
  460. ret = nvmem_cell_read_u32(&pdev->dev, "temp_grade", &val);
  461. if (ret)
  462. return ret;
  463. imx_init_temp_grade(pdev, val);
  464. return 0;
  465. }
  466. static irqreturn_t imx_thermal_alarm_irq(int irq, void *dev)
  467. {
  468. struct imx_thermal_data *data = dev;
  469. disable_irq_nosync(irq);
  470. data->irq_enabled = false;
  471. return IRQ_WAKE_THREAD;
  472. }
  473. static irqreturn_t imx_thermal_alarm_irq_thread(int irq, void *dev)
  474. {
  475. struct imx_thermal_data *data = dev;
  476. dev_dbg(&data->tz->device, "THERMAL ALARM: T > %d\n",
  477. data->alarm_temp / 1000);
  478. thermal_zone_device_update(data->tz, THERMAL_EVENT_UNSPECIFIED);
  479. return IRQ_HANDLED;
  480. }
  481. static const struct of_device_id of_imx_thermal_match[] = {
  482. { .compatible = "fsl,imx6q-tempmon", .data = &thermal_imx6q_data, },
  483. { .compatible = "fsl,imx6sx-tempmon", .data = &thermal_imx6sx_data, },
  484. { .compatible = "fsl,imx7d-tempmon", .data = &thermal_imx7d_data, },
  485. { /* end */ }
  486. };
  487. MODULE_DEVICE_TABLE(of, of_imx_thermal_match);
  488. #ifdef CONFIG_CPU_FREQ
  489. /*
  490. * Create cooling device in case no #cooling-cells property is available in
  491. * CPU node
  492. */
  493. static int imx_thermal_register_legacy_cooling(struct imx_thermal_data *data)
  494. {
  495. struct device_node *np;
  496. int ret = 0;
  497. data->policy = cpufreq_cpu_get(0);
  498. if (!data->policy) {
  499. pr_debug("%s: CPUFreq policy not found\n", __func__);
  500. return -EPROBE_DEFER;
  501. }
  502. np = of_get_cpu_node(data->policy->cpu, NULL);
  503. if (!np || !of_find_property(np, "#cooling-cells", NULL)) {
  504. data->cdev = cpufreq_cooling_register(data->policy);
  505. if (IS_ERR(data->cdev)) {
  506. ret = PTR_ERR(data->cdev);
  507. cpufreq_cpu_put(data->policy);
  508. }
  509. }
  510. of_node_put(np);
  511. return ret;
  512. }
  513. static void imx_thermal_unregister_legacy_cooling(struct imx_thermal_data *data)
  514. {
  515. cpufreq_cooling_unregister(data->cdev);
  516. cpufreq_cpu_put(data->policy);
  517. }
  518. #else
  519. static inline int imx_thermal_register_legacy_cooling(struct imx_thermal_data *data)
  520. {
  521. return 0;
  522. }
  523. static inline void imx_thermal_unregister_legacy_cooling(struct imx_thermal_data *data)
  524. {
  525. }
  526. #endif
  527. static int imx_thermal_probe(struct platform_device *pdev)
  528. {
  529. struct imx_thermal_data *data;
  530. struct regmap *map;
  531. int measure_freq;
  532. int ret;
  533. data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
  534. if (!data)
  535. return -ENOMEM;
  536. data->dev = &pdev->dev;
  537. map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "fsl,tempmon");
  538. if (IS_ERR(map)) {
  539. ret = PTR_ERR(map);
  540. dev_err(&pdev->dev, "failed to get tempmon regmap: %d\n", ret);
  541. return ret;
  542. }
  543. data->tempmon = map;
  544. data->socdata = of_device_get_match_data(&pdev->dev);
  545. if (!data->socdata) {
  546. dev_err(&pdev->dev, "no device match found\n");
  547. return -ENODEV;
  548. }
  549. /* make sure the IRQ flag is clear before enabling irq on i.MX6SX */
  550. if (data->socdata->version == TEMPMON_IMX6SX) {
  551. regmap_write(map, IMX6_MISC1 + REG_CLR,
  552. IMX6_MISC1_IRQ_TEMPHIGH | IMX6_MISC1_IRQ_TEMPLOW
  553. | IMX6_MISC1_IRQ_TEMPPANIC);
  554. /*
  555. * reset value of LOW ALARM is incorrect, set it to lowest
  556. * value to avoid false trigger of low alarm.
  557. */
  558. regmap_write(map, data->socdata->low_alarm_ctrl + REG_SET,
  559. data->socdata->low_alarm_mask);
  560. }
  561. data->irq = platform_get_irq(pdev, 0);
  562. if (data->irq < 0)
  563. return data->irq;
  564. platform_set_drvdata(pdev, data);
  565. if (of_find_property(pdev->dev.of_node, "nvmem-cells", NULL)) {
  566. ret = imx_init_from_nvmem_cells(pdev);
  567. if (ret)
  568. return dev_err_probe(&pdev->dev, ret,
  569. "failed to init from nvmem\n");
  570. } else {
  571. ret = imx_init_from_tempmon_data(pdev);
  572. if (ret) {
  573. dev_err(&pdev->dev, "failed to init from fsl,tempmon-data\n");
  574. return ret;
  575. }
  576. }
  577. /* Make sure sensor is in known good state for measurements */
  578. regmap_write(map, data->socdata->sensor_ctrl + REG_CLR,
  579. data->socdata->power_down_mask);
  580. regmap_write(map, data->socdata->sensor_ctrl + REG_CLR,
  581. data->socdata->measure_temp_mask);
  582. regmap_write(map, data->socdata->measure_freq_ctrl + REG_CLR,
  583. data->socdata->measure_freq_mask);
  584. if (data->socdata->version != TEMPMON_IMX7D)
  585. regmap_write(map, IMX6_MISC0 + REG_SET,
  586. IMX6_MISC0_REFTOP_SELBIASOFF);
  587. regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
  588. data->socdata->power_down_mask);
  589. ret = imx_thermal_register_legacy_cooling(data);
  590. if (ret)
  591. return dev_err_probe(&pdev->dev, ret,
  592. "failed to register cpufreq cooling device\n");
  593. data->thermal_clk = devm_clk_get(&pdev->dev, NULL);
  594. if (IS_ERR(data->thermal_clk)) {
  595. ret = PTR_ERR(data->thermal_clk);
  596. if (ret != -EPROBE_DEFER)
  597. dev_err(&pdev->dev,
  598. "failed to get thermal clk: %d\n", ret);
  599. goto legacy_cleanup;
  600. }
  601. /*
  602. * Thermal sensor needs clk on to get correct value, normally
  603. * we should enable its clk before taking measurement and disable
  604. * clk after measurement is done, but if alarm function is enabled,
  605. * hardware will auto measure the temperature periodically, so we
  606. * need to keep the clk always on for alarm function.
  607. */
  608. ret = clk_prepare_enable(data->thermal_clk);
  609. if (ret) {
  610. dev_err(&pdev->dev, "failed to enable thermal clk: %d\n", ret);
  611. goto legacy_cleanup;
  612. }
  613. data->tz = thermal_zone_device_register("imx_thermal_zone",
  614. IMX_TRIP_NUM,
  615. BIT(IMX_TRIP_PASSIVE), data,
  616. &imx_tz_ops, NULL,
  617. IMX_PASSIVE_DELAY,
  618. IMX_POLLING_DELAY);
  619. if (IS_ERR(data->tz)) {
  620. ret = PTR_ERR(data->tz);
  621. dev_err(&pdev->dev,
  622. "failed to register thermal zone device %d\n", ret);
  623. goto clk_disable;
  624. }
  625. dev_info(&pdev->dev, "%s CPU temperature grade - max:%dC"
  626. " critical:%dC passive:%dC\n", data->temp_grade,
  627. data->temp_max / 1000, data->temp_critical / 1000,
  628. data->temp_passive / 1000);
  629. /* Enable measurements at ~ 10 Hz */
  630. regmap_write(map, data->socdata->measure_freq_ctrl + REG_CLR,
  631. data->socdata->measure_freq_mask);
  632. measure_freq = DIV_ROUND_UP(32768, 10); /* 10 Hz */
  633. regmap_write(map, data->socdata->measure_freq_ctrl + REG_SET,
  634. measure_freq << data->socdata->measure_freq_shift);
  635. imx_set_alarm_temp(data, data->temp_passive);
  636. if (data->socdata->version == TEMPMON_IMX6SX)
  637. imx_set_panic_temp(data, data->temp_critical);
  638. regmap_write(map, data->socdata->sensor_ctrl + REG_CLR,
  639. data->socdata->power_down_mask);
  640. regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
  641. data->socdata->measure_temp_mask);
  642. /* After power up, we need a delay before first access can be done. */
  643. usleep_range(20, 50);
  644. /* the core was configured and enabled just before */
  645. pm_runtime_set_active(&pdev->dev);
  646. pm_runtime_enable(data->dev);
  647. ret = pm_runtime_resume_and_get(data->dev);
  648. if (ret < 0)
  649. goto disable_runtime_pm;
  650. data->irq_enabled = true;
  651. ret = thermal_zone_device_enable(data->tz);
  652. if (ret)
  653. goto thermal_zone_unregister;
  654. ret = devm_request_threaded_irq(&pdev->dev, data->irq,
  655. imx_thermal_alarm_irq, imx_thermal_alarm_irq_thread,
  656. 0, "imx_thermal", data);
  657. if (ret < 0) {
  658. dev_err(&pdev->dev, "failed to request alarm irq: %d\n", ret);
  659. goto thermal_zone_unregister;
  660. }
  661. pm_runtime_put(data->dev);
  662. return 0;
  663. thermal_zone_unregister:
  664. thermal_zone_device_unregister(data->tz);
  665. disable_runtime_pm:
  666. pm_runtime_put_noidle(data->dev);
  667. pm_runtime_disable(data->dev);
  668. clk_disable:
  669. clk_disable_unprepare(data->thermal_clk);
  670. legacy_cleanup:
  671. imx_thermal_unregister_legacy_cooling(data);
  672. return ret;
  673. }
  674. static int imx_thermal_remove(struct platform_device *pdev)
  675. {
  676. struct imx_thermal_data *data = platform_get_drvdata(pdev);
  677. pm_runtime_put_noidle(data->dev);
  678. pm_runtime_disable(data->dev);
  679. thermal_zone_device_unregister(data->tz);
  680. imx_thermal_unregister_legacy_cooling(data);
  681. return 0;
  682. }
  683. static int __maybe_unused imx_thermal_suspend(struct device *dev)
  684. {
  685. struct imx_thermal_data *data = dev_get_drvdata(dev);
  686. int ret;
  687. /*
  688. * Need to disable thermal sensor, otherwise, when thermal core
  689. * try to get temperature before thermal sensor resume, a wrong
  690. * temperature will be read as the thermal sensor is powered
  691. * down. This is done in change_mode() operation called from
  692. * thermal_zone_device_disable()
  693. */
  694. ret = thermal_zone_device_disable(data->tz);
  695. if (ret)
  696. return ret;
  697. return pm_runtime_force_suspend(data->dev);
  698. }
  699. static int __maybe_unused imx_thermal_resume(struct device *dev)
  700. {
  701. struct imx_thermal_data *data = dev_get_drvdata(dev);
  702. int ret;
  703. ret = pm_runtime_force_resume(data->dev);
  704. if (ret)
  705. return ret;
  706. /* Enabled thermal sensor after resume */
  707. return thermal_zone_device_enable(data->tz);
  708. }
  709. static int __maybe_unused imx_thermal_runtime_suspend(struct device *dev)
  710. {
  711. struct imx_thermal_data *data = dev_get_drvdata(dev);
  712. const struct thermal_soc_data *socdata = data->socdata;
  713. struct regmap *map = data->tempmon;
  714. int ret;
  715. ret = regmap_write(map, socdata->sensor_ctrl + REG_CLR,
  716. socdata->measure_temp_mask);
  717. if (ret)
  718. return ret;
  719. ret = regmap_write(map, socdata->sensor_ctrl + REG_SET,
  720. socdata->power_down_mask);
  721. if (ret)
  722. return ret;
  723. clk_disable_unprepare(data->thermal_clk);
  724. return 0;
  725. }
  726. static int __maybe_unused imx_thermal_runtime_resume(struct device *dev)
  727. {
  728. struct imx_thermal_data *data = dev_get_drvdata(dev);
  729. const struct thermal_soc_data *socdata = data->socdata;
  730. struct regmap *map = data->tempmon;
  731. int ret;
  732. ret = clk_prepare_enable(data->thermal_clk);
  733. if (ret)
  734. return ret;
  735. ret = regmap_write(map, socdata->sensor_ctrl + REG_CLR,
  736. socdata->power_down_mask);
  737. if (ret)
  738. return ret;
  739. ret = regmap_write(map, socdata->sensor_ctrl + REG_SET,
  740. socdata->measure_temp_mask);
  741. if (ret)
  742. return ret;
  743. /*
  744. * According to the temp sensor designers, it may require up to ~17us
  745. * to complete a measurement.
  746. */
  747. usleep_range(20, 50);
  748. return 0;
  749. }
  750. static const struct dev_pm_ops imx_thermal_pm_ops = {
  751. SET_SYSTEM_SLEEP_PM_OPS(imx_thermal_suspend, imx_thermal_resume)
  752. SET_RUNTIME_PM_OPS(imx_thermal_runtime_suspend,
  753. imx_thermal_runtime_resume, NULL)
  754. };
  755. static struct platform_driver imx_thermal = {
  756. .driver = {
  757. .name = "imx_thermal",
  758. .pm = &imx_thermal_pm_ops,
  759. .of_match_table = of_imx_thermal_match,
  760. },
  761. .probe = imx_thermal_probe,
  762. .remove = imx_thermal_remove,
  763. };
  764. module_platform_driver(imx_thermal);
  765. MODULE_AUTHOR("Freescale Semiconductor, Inc.");
  766. MODULE_DESCRIPTION("Thermal driver for Freescale i.MX SoCs");
  767. MODULE_LICENSE("GPL v2");
  768. MODULE_ALIAS("platform:imx-thermal");