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1 | /* |
2 | * Copyright (C) 2017 Spreadtrum Communications Inc. | |
3 | * | |
4 | * SPDX-License-Identifier: GPL-2.0 | |
5 | */ | |
6 | ||
7 | #include <linux/bitops.h> | |
8 | #include <linux/delay.h> | |
9 | #include <linux/err.h> | |
10 | #include <linux/module.h> | |
11 | #include <linux/of.h> | |
12 | #include <linux/platform_device.h> | |
13 | #include <linux/regmap.h> | |
14 | #include <linux/rtc.h> | |
15 | ||
16 | #define SPRD_RTC_SEC_CNT_VALUE 0x0 | |
17 | #define SPRD_RTC_MIN_CNT_VALUE 0x4 | |
18 | #define SPRD_RTC_HOUR_CNT_VALUE 0x8 | |
19 | #define SPRD_RTC_DAY_CNT_VALUE 0xc | |
20 | #define SPRD_RTC_SEC_CNT_UPD 0x10 | |
21 | #define SPRD_RTC_MIN_CNT_UPD 0x14 | |
22 | #define SPRD_RTC_HOUR_CNT_UPD 0x18 | |
23 | #define SPRD_RTC_DAY_CNT_UPD 0x1c | |
24 | #define SPRD_RTC_SEC_ALM_UPD 0x20 | |
25 | #define SPRD_RTC_MIN_ALM_UPD 0x24 | |
26 | #define SPRD_RTC_HOUR_ALM_UPD 0x28 | |
27 | #define SPRD_RTC_DAY_ALM_UPD 0x2c | |
28 | #define SPRD_RTC_INT_EN 0x30 | |
29 | #define SPRD_RTC_INT_RAW_STS 0x34 | |
30 | #define SPRD_RTC_INT_CLR 0x38 | |
31 | #define SPRD_RTC_INT_MASK_STS 0x3C | |
32 | #define SPRD_RTC_SEC_ALM_VALUE 0x40 | |
33 | #define SPRD_RTC_MIN_ALM_VALUE 0x44 | |
34 | #define SPRD_RTC_HOUR_ALM_VALUE 0x48 | |
35 | #define SPRD_RTC_DAY_ALM_VALUE 0x4c | |
36 | #define SPRD_RTC_SPG_VALUE 0x50 | |
37 | #define SPRD_RTC_SPG_UPD 0x54 | |
38 | #define SPRD_RTC_SEC_AUXALM_UPD 0x60 | |
39 | #define SPRD_RTC_MIN_AUXALM_UPD 0x64 | |
40 | #define SPRD_RTC_HOUR_AUXALM_UPD 0x68 | |
41 | #define SPRD_RTC_DAY_AUXALM_UPD 0x6c | |
42 | ||
43 | /* BIT & MASK definition for SPRD_RTC_INT_* registers */ | |
44 | #define SPRD_RTC_SEC_EN BIT(0) | |
45 | #define SPRD_RTC_MIN_EN BIT(1) | |
46 | #define SPRD_RTC_HOUR_EN BIT(2) | |
47 | #define SPRD_RTC_DAY_EN BIT(3) | |
48 | #define SPRD_RTC_ALARM_EN BIT(4) | |
49 | #define SPRD_RTC_HRS_FORMAT_EN BIT(5) | |
50 | #define SPRD_RTC_AUXALM_EN BIT(6) | |
51 | #define SPRD_RTC_SPG_UPD_EN BIT(7) | |
52 | #define SPRD_RTC_SEC_UPD_EN BIT(8) | |
53 | #define SPRD_RTC_MIN_UPD_EN BIT(9) | |
54 | #define SPRD_RTC_HOUR_UPD_EN BIT(10) | |
55 | #define SPRD_RTC_DAY_UPD_EN BIT(11) | |
56 | #define SPRD_RTC_ALMSEC_UPD_EN BIT(12) | |
57 | #define SPRD_RTC_ALMMIN_UPD_EN BIT(13) | |
58 | #define SPRD_RTC_ALMHOUR_UPD_EN BIT(14) | |
59 | #define SPRD_RTC_ALMDAY_UPD_EN BIT(15) | |
60 | #define SPRD_RTC_INT_MASK GENMASK(15, 0) | |
61 | ||
62 | #define SPRD_RTC_TIME_INT_MASK \ | |
63 | (SPRD_RTC_SEC_UPD_EN | SPRD_RTC_MIN_UPD_EN | \ | |
64 | SPRD_RTC_HOUR_UPD_EN | SPRD_RTC_DAY_UPD_EN) | |
65 | ||
66 | #define SPRD_RTC_ALMTIME_INT_MASK \ | |
67 | (SPRD_RTC_ALMSEC_UPD_EN | SPRD_RTC_ALMMIN_UPD_EN | \ | |
68 | SPRD_RTC_ALMHOUR_UPD_EN | SPRD_RTC_ALMDAY_UPD_EN) | |
69 | ||
70 | #define SPRD_RTC_ALM_INT_MASK \ | |
71 | (SPRD_RTC_SEC_EN | SPRD_RTC_MIN_EN | \ | |
72 | SPRD_RTC_HOUR_EN | SPRD_RTC_DAY_EN | \ | |
73 | SPRD_RTC_ALARM_EN | SPRD_RTC_AUXALM_EN) | |
74 | ||
75 | /* second/minute/hour/day values mask definition */ | |
76 | #define SPRD_RTC_SEC_MASK GENMASK(5, 0) | |
77 | #define SPRD_RTC_MIN_MASK GENMASK(5, 0) | |
78 | #define SPRD_RTC_HOUR_MASK GENMASK(4, 0) | |
79 | #define SPRD_RTC_DAY_MASK GENMASK(15, 0) | |
80 | ||
81 | /* alarm lock definition for SPRD_RTC_SPG_UPD register */ | |
82 | #define SPRD_RTC_ALMLOCK_MASK GENMASK(7, 0) | |
83 | #define SPRD_RTC_ALM_UNLOCK 0xa5 | |
84 | #define SPRD_RTC_ALM_LOCK (~SPRD_RTC_ALM_UNLOCK & \ | |
85 | SPRD_RTC_ALMLOCK_MASK) | |
86 | ||
87 | /* SPG values definition for SPRD_RTC_SPG_UPD register */ | |
88 | #define SPRD_RTC_POWEROFF_ALM_FLAG BIT(8) | |
89 | #define SPRD_RTC_POWER_RESET_FLAG BIT(9) | |
90 | ||
91 | /* timeout of synchronizing time and alarm registers (us) */ | |
92 | #define SPRD_RTC_POLL_TIMEOUT 200000 | |
93 | #define SPRD_RTC_POLL_DELAY_US 20000 | |
94 | ||
95 | struct sprd_rtc { | |
96 | struct rtc_device *rtc; | |
97 | struct regmap *regmap; | |
98 | struct device *dev; | |
99 | u32 base; | |
100 | int irq; | |
101 | bool valid; | |
102 | }; | |
103 | ||
104 | /* | |
105 | * The Spreadtrum RTC controller has 3 groups registers, including time, normal | |
106 | * alarm and auxiliary alarm. The time group registers are used to set RTC time, | |
107 | * the normal alarm registers are used to set normal alarm, and the auxiliary | |
108 | * alarm registers are used to set auxiliary alarm. Both alarm event and | |
109 | * auxiliary alarm event can wake up system from deep sleep, but only alarm | |
110 | * event can power up system from power down status. | |
111 | */ | |
112 | enum sprd_rtc_reg_types { | |
113 | SPRD_RTC_TIME, | |
114 | SPRD_RTC_ALARM, | |
115 | SPRD_RTC_AUX_ALARM, | |
116 | }; | |
117 | ||
118 | static int sprd_rtc_clear_alarm_ints(struct sprd_rtc *rtc) | |
119 | { | |
120 | return regmap_write(rtc->regmap, rtc->base + SPRD_RTC_INT_CLR, | |
121 | SPRD_RTC_ALM_INT_MASK); | |
122 | } | |
123 | ||
124 | static int sprd_rtc_disable_ints(struct sprd_rtc *rtc) | |
125 | { | |
126 | int ret; | |
127 | ||
128 | ret = regmap_update_bits(rtc->regmap, rtc->base + SPRD_RTC_INT_EN, | |
129 | SPRD_RTC_INT_MASK, 0); | |
130 | if (ret) | |
131 | return ret; | |
132 | ||
133 | return regmap_write(rtc->regmap, rtc->base + SPRD_RTC_INT_CLR, | |
134 | SPRD_RTC_INT_MASK); | |
135 | } | |
136 | ||
137 | static int sprd_rtc_lock_alarm(struct sprd_rtc *rtc, bool lock) | |
138 | { | |
139 | int ret; | |
140 | u32 val; | |
141 | ||
142 | ret = regmap_read(rtc->regmap, rtc->base + SPRD_RTC_SPG_VALUE, &val); | |
143 | if (ret) | |
144 | return ret; | |
145 | ||
146 | val &= ~(SPRD_RTC_ALMLOCK_MASK | SPRD_RTC_POWEROFF_ALM_FLAG); | |
147 | if (lock) | |
148 | val |= SPRD_RTC_ALM_LOCK; | |
149 | else | |
150 | val |= SPRD_RTC_ALM_UNLOCK | SPRD_RTC_POWEROFF_ALM_FLAG; | |
151 | ||
152 | ret = regmap_write(rtc->regmap, rtc->base + SPRD_RTC_SPG_UPD, val); | |
153 | if (ret) | |
154 | return ret; | |
155 | ||
156 | /* wait until the SPG value is updated successfully */ | |
157 | ret = regmap_read_poll_timeout(rtc->regmap, | |
158 | rtc->base + SPRD_RTC_INT_RAW_STS, val, | |
159 | (val & SPRD_RTC_SPG_UPD_EN), | |
160 | SPRD_RTC_POLL_DELAY_US, | |
161 | SPRD_RTC_POLL_TIMEOUT); | |
162 | if (ret) { | |
163 | dev_err(rtc->dev, "failed to update SPG value:%d\n", ret); | |
164 | return ret; | |
165 | } | |
166 | ||
167 | return 0; | |
168 | } | |
169 | ||
170 | static int sprd_rtc_get_secs(struct sprd_rtc *rtc, enum sprd_rtc_reg_types type, | |
171 | time64_t *secs) | |
172 | { | |
173 | u32 sec_reg, min_reg, hour_reg, day_reg; | |
174 | u32 val, sec, min, hour, day; | |
175 | int ret; | |
176 | ||
177 | switch (type) { | |
178 | case SPRD_RTC_TIME: | |
179 | sec_reg = SPRD_RTC_SEC_CNT_VALUE; | |
180 | min_reg = SPRD_RTC_MIN_CNT_VALUE; | |
181 | hour_reg = SPRD_RTC_HOUR_CNT_VALUE; | |
182 | day_reg = SPRD_RTC_DAY_CNT_VALUE; | |
183 | break; | |
184 | case SPRD_RTC_ALARM: | |
185 | sec_reg = SPRD_RTC_SEC_ALM_VALUE; | |
186 | min_reg = SPRD_RTC_MIN_ALM_VALUE; | |
187 | hour_reg = SPRD_RTC_HOUR_ALM_VALUE; | |
188 | day_reg = SPRD_RTC_DAY_ALM_VALUE; | |
189 | break; | |
190 | case SPRD_RTC_AUX_ALARM: | |
191 | sec_reg = SPRD_RTC_SEC_AUXALM_UPD; | |
192 | min_reg = SPRD_RTC_MIN_AUXALM_UPD; | |
193 | hour_reg = SPRD_RTC_HOUR_AUXALM_UPD; | |
194 | day_reg = SPRD_RTC_DAY_AUXALM_UPD; | |
195 | break; | |
196 | default: | |
197 | return -EINVAL; | |
198 | } | |
199 | ||
200 | ret = regmap_read(rtc->regmap, rtc->base + sec_reg, &val); | |
201 | if (ret) | |
202 | return ret; | |
203 | ||
204 | sec = val & SPRD_RTC_SEC_MASK; | |
205 | ||
206 | ret = regmap_read(rtc->regmap, rtc->base + min_reg, &val); | |
207 | if (ret) | |
208 | return ret; | |
209 | ||
210 | min = val & SPRD_RTC_MIN_MASK; | |
211 | ||
212 | ret = regmap_read(rtc->regmap, rtc->base + hour_reg, &val); | |
213 | if (ret) | |
214 | return ret; | |
215 | ||
216 | hour = val & SPRD_RTC_HOUR_MASK; | |
217 | ||
218 | ret = regmap_read(rtc->regmap, rtc->base + day_reg, &val); | |
219 | if (ret) | |
220 | return ret; | |
221 | ||
222 | day = val & SPRD_RTC_DAY_MASK; | |
223 | *secs = (((time64_t)(day * 24) + hour) * 60 + min) * 60 + sec; | |
224 | return 0; | |
225 | } | |
226 | ||
227 | static int sprd_rtc_set_secs(struct sprd_rtc *rtc, enum sprd_rtc_reg_types type, | |
228 | time64_t secs) | |
229 | { | |
230 | u32 sec_reg, min_reg, hour_reg, day_reg, sts_mask; | |
231 | u32 sec, min, hour, day, val; | |
232 | int ret, rem; | |
233 | ||
234 | /* convert seconds to RTC time format */ | |
235 | day = div_s64_rem(secs, 86400, &rem); | |
236 | hour = rem / 3600; | |
237 | rem -= hour * 3600; | |
238 | min = rem / 60; | |
239 | sec = rem - min * 60; | |
240 | ||
241 | switch (type) { | |
242 | case SPRD_RTC_TIME: | |
243 | sec_reg = SPRD_RTC_SEC_CNT_UPD; | |
244 | min_reg = SPRD_RTC_MIN_CNT_UPD; | |
245 | hour_reg = SPRD_RTC_HOUR_CNT_UPD; | |
246 | day_reg = SPRD_RTC_DAY_CNT_UPD; | |
247 | sts_mask = SPRD_RTC_TIME_INT_MASK; | |
248 | break; | |
249 | case SPRD_RTC_ALARM: | |
250 | sec_reg = SPRD_RTC_SEC_ALM_UPD; | |
251 | min_reg = SPRD_RTC_MIN_ALM_UPD; | |
252 | hour_reg = SPRD_RTC_HOUR_ALM_UPD; | |
253 | day_reg = SPRD_RTC_DAY_ALM_UPD; | |
254 | sts_mask = SPRD_RTC_ALMTIME_INT_MASK; | |
255 | break; | |
256 | case SPRD_RTC_AUX_ALARM: | |
257 | sec_reg = SPRD_RTC_SEC_AUXALM_UPD; | |
258 | min_reg = SPRD_RTC_MIN_AUXALM_UPD; | |
259 | hour_reg = SPRD_RTC_HOUR_AUXALM_UPD; | |
260 | day_reg = SPRD_RTC_DAY_AUXALM_UPD; | |
261 | sts_mask = 0; | |
262 | break; | |
263 | default: | |
264 | return -EINVAL; | |
265 | } | |
266 | ||
267 | ret = regmap_write(rtc->regmap, rtc->base + sec_reg, sec); | |
268 | if (ret) | |
269 | return ret; | |
270 | ||
271 | ret = regmap_write(rtc->regmap, rtc->base + min_reg, min); | |
272 | if (ret) | |
273 | return ret; | |
274 | ||
275 | ret = regmap_write(rtc->regmap, rtc->base + hour_reg, hour); | |
276 | if (ret) | |
277 | return ret; | |
278 | ||
279 | ret = regmap_write(rtc->regmap, rtc->base + day_reg, day); | |
280 | if (ret) | |
281 | return ret; | |
282 | ||
283 | if (type == SPRD_RTC_AUX_ALARM) | |
284 | return 0; | |
285 | ||
286 | /* | |
287 | * Since the time and normal alarm registers are put in always-power-on | |
288 | * region supplied by VDDRTC, then these registers changing time will | |
289 | * be very long, about 125ms. Thus here we should wait until all | |
290 | * values are updated successfully. | |
291 | */ | |
292 | ret = regmap_read_poll_timeout(rtc->regmap, | |
293 | rtc->base + SPRD_RTC_INT_RAW_STS, val, | |
294 | ((val & sts_mask) == sts_mask), | |
295 | SPRD_RTC_POLL_DELAY_US, | |
296 | SPRD_RTC_POLL_TIMEOUT); | |
297 | if (ret < 0) { | |
298 | dev_err(rtc->dev, "set time/alarm values timeout\n"); | |
299 | return ret; | |
300 | } | |
301 | ||
302 | return regmap_write(rtc->regmap, rtc->base + SPRD_RTC_INT_CLR, | |
303 | sts_mask); | |
304 | } | |
305 | ||
306 | static int sprd_rtc_read_aux_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
307 | { | |
308 | struct sprd_rtc *rtc = dev_get_drvdata(dev); | |
309 | time64_t secs; | |
310 | u32 val; | |
311 | int ret; | |
312 | ||
313 | ret = sprd_rtc_get_secs(rtc, SPRD_RTC_AUX_ALARM, &secs); | |
314 | if (ret) | |
315 | return ret; | |
316 | ||
317 | rtc_time64_to_tm(secs, &alrm->time); | |
318 | ||
319 | ret = regmap_read(rtc->regmap, rtc->base + SPRD_RTC_INT_EN, &val); | |
320 | if (ret) | |
321 | return ret; | |
322 | ||
323 | alrm->enabled = !!(val & SPRD_RTC_AUXALM_EN); | |
324 | ||
325 | ret = regmap_read(rtc->regmap, rtc->base + SPRD_RTC_INT_RAW_STS, &val); | |
326 | if (ret) | |
327 | return ret; | |
328 | ||
329 | alrm->pending = !!(val & SPRD_RTC_AUXALM_EN); | |
330 | return 0; | |
331 | } | |
332 | ||
333 | static int sprd_rtc_set_aux_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
334 | { | |
335 | struct sprd_rtc *rtc = dev_get_drvdata(dev); | |
336 | time64_t secs = rtc_tm_to_time64(&alrm->time); | |
337 | int ret; | |
338 | ||
339 | /* clear the auxiliary alarm interrupt status */ | |
340 | ret = regmap_write(rtc->regmap, rtc->base + SPRD_RTC_INT_CLR, | |
341 | SPRD_RTC_AUXALM_EN); | |
342 | if (ret) | |
343 | return ret; | |
344 | ||
345 | ret = sprd_rtc_set_secs(rtc, SPRD_RTC_AUX_ALARM, secs); | |
346 | if (ret) | |
347 | return ret; | |
348 | ||
349 | if (alrm->enabled) { | |
350 | ret = regmap_update_bits(rtc->regmap, | |
351 | rtc->base + SPRD_RTC_INT_EN, | |
352 | SPRD_RTC_AUXALM_EN, | |
353 | SPRD_RTC_AUXALM_EN); | |
354 | } else { | |
355 | ret = regmap_update_bits(rtc->regmap, | |
356 | rtc->base + SPRD_RTC_INT_EN, | |
357 | SPRD_RTC_AUXALM_EN, 0); | |
358 | } | |
359 | ||
360 | return ret; | |
361 | } | |
362 | ||
363 | static int sprd_rtc_read_time(struct device *dev, struct rtc_time *tm) | |
364 | { | |
365 | struct sprd_rtc *rtc = dev_get_drvdata(dev); | |
366 | time64_t secs; | |
367 | int ret; | |
368 | ||
369 | if (!rtc->valid) { | |
370 | dev_warn(dev, "RTC values are invalid\n"); | |
371 | return -EINVAL; | |
372 | } | |
373 | ||
374 | ret = sprd_rtc_get_secs(rtc, SPRD_RTC_TIME, &secs); | |
375 | if (ret) | |
376 | return ret; | |
377 | ||
378 | rtc_time64_to_tm(secs, tm); | |
66b32fc5 | 379 | return 0; |
495bbde5 BW |
380 | } |
381 | ||
382 | static int sprd_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
383 | { | |
384 | struct sprd_rtc *rtc = dev_get_drvdata(dev); | |
385 | time64_t secs = rtc_tm_to_time64(tm); | |
386 | u32 val; | |
387 | int ret; | |
388 | ||
389 | ret = sprd_rtc_set_secs(rtc, SPRD_RTC_TIME, secs); | |
390 | if (ret) | |
391 | return ret; | |
392 | ||
393 | if (!rtc->valid) { | |
394 | /* | |
395 | * Set SPRD_RTC_POWER_RESET_FLAG to indicate now RTC has valid | |
396 | * time values. | |
397 | */ | |
398 | ret = regmap_update_bits(rtc->regmap, | |
399 | rtc->base + SPRD_RTC_SPG_UPD, | |
400 | SPRD_RTC_POWER_RESET_FLAG, | |
401 | SPRD_RTC_POWER_RESET_FLAG); | |
402 | if (ret) | |
403 | return ret; | |
404 | ||
405 | ret = regmap_read_poll_timeout(rtc->regmap, | |
406 | rtc->base + SPRD_RTC_INT_RAW_STS, | |
407 | val, (val & SPRD_RTC_SPG_UPD_EN), | |
408 | SPRD_RTC_POLL_DELAY_US, | |
409 | SPRD_RTC_POLL_TIMEOUT); | |
410 | if (ret) { | |
411 | dev_err(rtc->dev, "failed to update SPG value:%d\n", | |
412 | ret); | |
413 | return ret; | |
414 | } | |
415 | ||
416 | rtc->valid = true; | |
417 | } | |
418 | ||
419 | return 0; | |
420 | } | |
421 | ||
422 | static int sprd_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
423 | { | |
424 | struct sprd_rtc *rtc = dev_get_drvdata(dev); | |
425 | time64_t secs; | |
426 | int ret; | |
427 | u32 val; | |
428 | ||
429 | /* | |
430 | * If aie_timer is enabled, we should get the normal alarm time. | |
431 | * Otherwise we should get auxiliary alarm time. | |
432 | */ | |
433 | if (rtc->rtc && rtc->rtc->aie_timer.enabled == 0) | |
434 | return sprd_rtc_read_aux_alarm(dev, alrm); | |
435 | ||
436 | ret = sprd_rtc_get_secs(rtc, SPRD_RTC_ALARM, &secs); | |
437 | if (ret) | |
438 | return ret; | |
439 | ||
440 | rtc_time64_to_tm(secs, &alrm->time); | |
441 | ||
442 | ret = regmap_read(rtc->regmap, rtc->base + SPRD_RTC_INT_EN, &val); | |
443 | if (ret) | |
444 | return ret; | |
445 | ||
446 | alrm->enabled = !!(val & SPRD_RTC_ALARM_EN); | |
447 | ||
448 | ret = regmap_read(rtc->regmap, rtc->base + SPRD_RTC_INT_RAW_STS, &val); | |
449 | if (ret) | |
450 | return ret; | |
451 | ||
452 | alrm->pending = !!(val & SPRD_RTC_ALARM_EN); | |
453 | return 0; | |
454 | } | |
455 | ||
456 | static int sprd_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
457 | { | |
458 | struct sprd_rtc *rtc = dev_get_drvdata(dev); | |
459 | time64_t secs = rtc_tm_to_time64(&alrm->time); | |
460 | struct rtc_time aie_time = | |
461 | rtc_ktime_to_tm(rtc->rtc->aie_timer.node.expires); | |
462 | int ret; | |
463 | ||
464 | /* | |
465 | * We have 2 groups alarms: normal alarm and auxiliary alarm. Since | |
466 | * both normal alarm event and auxiliary alarm event can wake up system | |
467 | * from deep sleep, but only alarm event can power up system from power | |
468 | * down status. Moreover we do not need to poll about 125ms when | |
469 | * updating auxiliary alarm registers. Thus we usually set auxiliary | |
470 | * alarm when wake up system from deep sleep, and for other scenarios, | |
471 | * we should set normal alarm with polling status. | |
472 | * | |
473 | * So here we check if the alarm time is set by aie_timer, if yes, we | |
474 | * should set normal alarm, if not, we should set auxiliary alarm which | |
475 | * means it is just a wake event. | |
476 | */ | |
477 | if (!rtc->rtc->aie_timer.enabled || rtc_tm_sub(&aie_time, &alrm->time)) | |
478 | return sprd_rtc_set_aux_alarm(dev, alrm); | |
479 | ||
480 | /* clear the alarm interrupt status firstly */ | |
481 | ret = regmap_write(rtc->regmap, rtc->base + SPRD_RTC_INT_CLR, | |
482 | SPRD_RTC_ALARM_EN); | |
483 | if (ret) | |
484 | return ret; | |
485 | ||
486 | ret = sprd_rtc_set_secs(rtc, SPRD_RTC_ALARM, secs); | |
487 | if (ret) | |
488 | return ret; | |
489 | ||
490 | if (alrm->enabled) { | |
491 | ret = regmap_update_bits(rtc->regmap, | |
492 | rtc->base + SPRD_RTC_INT_EN, | |
493 | SPRD_RTC_ALARM_EN, | |
494 | SPRD_RTC_ALARM_EN); | |
495 | if (ret) | |
496 | return ret; | |
497 | ||
498 | /* unlock the alarm to enable the alarm function. */ | |
499 | ret = sprd_rtc_lock_alarm(rtc, false); | |
500 | } else { | |
501 | regmap_update_bits(rtc->regmap, | |
502 | rtc->base + SPRD_RTC_INT_EN, | |
503 | SPRD_RTC_ALARM_EN, 0); | |
504 | ||
505 | /* | |
506 | * Lock the alarm function in case fake alarm event will power | |
507 | * up systems. | |
508 | */ | |
509 | ret = sprd_rtc_lock_alarm(rtc, true); | |
510 | } | |
511 | ||
512 | return ret; | |
513 | } | |
514 | ||
515 | static int sprd_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) | |
516 | { | |
517 | struct sprd_rtc *rtc = dev_get_drvdata(dev); | |
518 | int ret; | |
519 | ||
520 | if (enabled) { | |
521 | ret = regmap_update_bits(rtc->regmap, | |
522 | rtc->base + SPRD_RTC_INT_EN, | |
523 | SPRD_RTC_ALARM_EN | SPRD_RTC_AUXALM_EN, | |
524 | SPRD_RTC_ALARM_EN | SPRD_RTC_AUXALM_EN); | |
525 | if (ret) | |
526 | return ret; | |
527 | ||
528 | ret = sprd_rtc_lock_alarm(rtc, false); | |
529 | } else { | |
530 | regmap_update_bits(rtc->regmap, rtc->base + SPRD_RTC_INT_EN, | |
531 | SPRD_RTC_ALARM_EN | SPRD_RTC_AUXALM_EN, 0); | |
532 | ||
533 | ret = sprd_rtc_lock_alarm(rtc, true); | |
534 | } | |
535 | ||
536 | return ret; | |
537 | } | |
538 | ||
539 | static const struct rtc_class_ops sprd_rtc_ops = { | |
540 | .read_time = sprd_rtc_read_time, | |
541 | .set_time = sprd_rtc_set_time, | |
542 | .read_alarm = sprd_rtc_read_alarm, | |
543 | .set_alarm = sprd_rtc_set_alarm, | |
544 | .alarm_irq_enable = sprd_rtc_alarm_irq_enable, | |
545 | }; | |
546 | ||
547 | static irqreturn_t sprd_rtc_handler(int irq, void *dev_id) | |
548 | { | |
549 | struct sprd_rtc *rtc = dev_id; | |
550 | int ret; | |
551 | ||
552 | ret = sprd_rtc_clear_alarm_ints(rtc); | |
553 | if (ret) | |
554 | return IRQ_RETVAL(ret); | |
555 | ||
556 | rtc_update_irq(rtc->rtc, 1, RTC_AF | RTC_IRQF); | |
557 | return IRQ_HANDLED; | |
558 | } | |
559 | ||
560 | static int sprd_rtc_check_power_down(struct sprd_rtc *rtc) | |
561 | { | |
562 | u32 val; | |
563 | int ret; | |
564 | ||
565 | ret = regmap_read(rtc->regmap, rtc->base + SPRD_RTC_SPG_VALUE, &val); | |
566 | if (ret) | |
567 | return ret; | |
568 | ||
569 | /* | |
570 | * If the SPRD_RTC_POWER_RESET_FLAG was not set, which means the RTC has | |
571 | * been powered down, so the RTC time values are invalid. | |
572 | */ | |
573 | rtc->valid = (val & SPRD_RTC_POWER_RESET_FLAG) ? true : false; | |
574 | return 0; | |
575 | } | |
576 | ||
577 | static int sprd_rtc_probe(struct platform_device *pdev) | |
578 | { | |
579 | struct device_node *node = pdev->dev.of_node; | |
580 | struct sprd_rtc *rtc; | |
581 | int ret; | |
582 | ||
583 | rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL); | |
584 | if (!rtc) | |
585 | return -ENOMEM; | |
586 | ||
587 | rtc->regmap = dev_get_regmap(pdev->dev.parent, NULL); | |
588 | if (!rtc->regmap) | |
589 | return -ENODEV; | |
590 | ||
591 | ret = of_property_read_u32(node, "reg", &rtc->base); | |
592 | if (ret) { | |
593 | dev_err(&pdev->dev, "failed to get RTC base address\n"); | |
594 | return ret; | |
595 | } | |
596 | ||
597 | rtc->irq = platform_get_irq(pdev, 0); | |
598 | if (rtc->irq < 0) { | |
599 | dev_err(&pdev->dev, "failed to get RTC irq number\n"); | |
600 | return rtc->irq; | |
601 | } | |
602 | ||
603 | rtc->dev = &pdev->dev; | |
604 | platform_set_drvdata(pdev, rtc); | |
605 | ||
606 | /* clear all RTC interrupts and disable all RTC interrupts */ | |
607 | ret = sprd_rtc_disable_ints(rtc); | |
608 | if (ret) { | |
609 | dev_err(&pdev->dev, "failed to disable RTC interrupts\n"); | |
610 | return ret; | |
611 | } | |
612 | ||
613 | /* check if RTC time values are valid */ | |
614 | ret = sprd_rtc_check_power_down(rtc); | |
615 | if (ret) { | |
616 | dev_err(&pdev->dev, "failed to check RTC time values\n"); | |
617 | return ret; | |
618 | } | |
619 | ||
620 | ret = devm_request_threaded_irq(&pdev->dev, rtc->irq, NULL, | |
621 | sprd_rtc_handler, | |
622 | IRQF_ONESHOT | IRQF_EARLY_RESUME, | |
623 | pdev->name, rtc); | |
624 | if (ret < 0) { | |
625 | dev_err(&pdev->dev, "failed to request RTC irq\n"); | |
626 | return ret; | |
627 | } | |
628 | ||
629 | rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name, | |
630 | &sprd_rtc_ops, THIS_MODULE); | |
631 | if (IS_ERR(rtc->rtc)) | |
632 | return PTR_ERR(rtc->rtc); | |
633 | ||
634 | device_init_wakeup(&pdev->dev, 1); | |
635 | return 0; | |
636 | } | |
637 | ||
638 | static int sprd_rtc_remove(struct platform_device *pdev) | |
639 | { | |
640 | device_init_wakeup(&pdev->dev, 0); | |
641 | return 0; | |
642 | } | |
643 | ||
644 | static const struct of_device_id sprd_rtc_of_match[] = { | |
645 | { .compatible = "sprd,sc2731-rtc", }, | |
646 | { }, | |
647 | }; | |
648 | MODULE_DEVICE_TABLE(of, sprd_rtc_of_match); | |
649 | ||
650 | static struct platform_driver sprd_rtc_driver = { | |
651 | .driver = { | |
652 | .name = "sprd-rtc", | |
653 | .of_match_table = sprd_rtc_of_match, | |
654 | }, | |
655 | .probe = sprd_rtc_probe, | |
656 | .remove = sprd_rtc_remove, | |
657 | }; | |
658 | module_platform_driver(sprd_rtc_driver); | |
659 | ||
660 | MODULE_LICENSE("GPL v2"); | |
661 | MODULE_DESCRIPTION("Spreadtrum RTC Device Driver"); | |
662 | MODULE_AUTHOR("Baolin Wang <baolin.wang@spreadtrum.com>"); |