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1/*
2 * Copyright (c) 2013-2014 Samsung Electronics Co., Ltd
3 * http://www.samsung.com
4 *
5 * Copyright (C) 2013 Google, Inc
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 */
17
18#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
19
20#include <linux/module.h>
21#include <linux/i2c.h>
22#include <linux/bcd.h>
23#include <linux/regmap.h>
24#include <linux/rtc.h>
25#include <linux/platform_device.h>
26#include <linux/mfd/samsung/core.h>
27#include <linux/mfd/samsung/irq.h>
28#include <linux/mfd/samsung/rtc.h>
29#include <linux/mfd/samsung/s2mps14.h>
30
31/*
32 * Maximum number of retries for checking changes in UDR field
33 * of S5M_RTC_UDR_CON register (to limit possible endless loop).
34 *
35 * After writing to RTC registers (setting time or alarm) read the UDR field
36 * in S5M_RTC_UDR_CON register. UDR is auto-cleared when data have
37 * been transferred.
38 */
39#define UDR_READ_RETRY_CNT 5
40
41/*
42 * Registers used by the driver which are different between chipsets.
43 *
44 * Operations like read time and write alarm/time require updating
45 * specific fields in UDR register. These fields usually are auto-cleared
46 * (with some exceptions).
47 *
48 * Table of operations per device:
49 *
50 * Device | Write time | Read time | Write alarm
51 * =================================================
52 * S5M8767 | UDR + TIME | | UDR
53 * S2MPS11/14 | WUDR | RUDR | WUDR + RUDR
54 * S2MPS13 | WUDR | RUDR | WUDR + AUDR
55 * S2MPS15 | WUDR | RUDR | AUDR
56 */
57struct s5m_rtc_reg_config {
58 /* Number of registers used for setting time/alarm0/alarm1 */
59 unsigned int regs_count;
60 /* First register for time, seconds */
61 unsigned int time;
62 /* RTC control register */
63 unsigned int ctrl;
64 /* First register for alarm 0, seconds */
65 unsigned int alarm0;
66 /* First register for alarm 1, seconds */
67 unsigned int alarm1;
68 /*
69 * Register for update flag (UDR). Typically setting UDR field to 1
70 * will enable update of time or alarm register. Then it will be
71 * auto-cleared after successful update.
72 */
73 unsigned int udr_update;
74 /* Auto-cleared mask in UDR field for writing time and alarm */
75 unsigned int autoclear_udr_mask;
76 /*
77 * Masks in UDR field for time and alarm operations.
78 * The read time mask can be 0. Rest should not.
79 */
80 unsigned int read_time_udr_mask;
81 unsigned int write_time_udr_mask;
82 unsigned int write_alarm_udr_mask;
83};
84
85/* Register map for S5M8763 and S5M8767 */
86static const struct s5m_rtc_reg_config s5m_rtc_regs = {
87 .regs_count = 8,
88 .time = S5M_RTC_SEC,
89 .ctrl = S5M_ALARM1_CONF,
90 .alarm0 = S5M_ALARM0_SEC,
91 .alarm1 = S5M_ALARM1_SEC,
92 .udr_update = S5M_RTC_UDR_CON,
93 .autoclear_udr_mask = S5M_RTC_UDR_MASK,
94 .read_time_udr_mask = 0, /* Not needed */
95 .write_time_udr_mask = S5M_RTC_UDR_MASK | S5M_RTC_TIME_EN_MASK,
96 .write_alarm_udr_mask = S5M_RTC_UDR_MASK,
97};
98
99/* Register map for S2MPS13 */
100static const struct s5m_rtc_reg_config s2mps13_rtc_regs = {
101 .regs_count = 7,
102 .time = S2MPS_RTC_SEC,
103 .ctrl = S2MPS_RTC_CTRL,
104 .alarm0 = S2MPS_ALARM0_SEC,
105 .alarm1 = S2MPS_ALARM1_SEC,
106 .udr_update = S2MPS_RTC_UDR_CON,
107 .autoclear_udr_mask = S2MPS_RTC_WUDR_MASK,
108 .read_time_udr_mask = S2MPS_RTC_RUDR_MASK,
109 .write_time_udr_mask = S2MPS_RTC_WUDR_MASK,
110 .write_alarm_udr_mask = S2MPS_RTC_WUDR_MASK | S2MPS13_RTC_AUDR_MASK,
111};
112
113/* Register map for S2MPS11/14 */
114static const struct s5m_rtc_reg_config s2mps14_rtc_regs = {
115 .regs_count = 7,
116 .time = S2MPS_RTC_SEC,
117 .ctrl = S2MPS_RTC_CTRL,
118 .alarm0 = S2MPS_ALARM0_SEC,
119 .alarm1 = S2MPS_ALARM1_SEC,
120 .udr_update = S2MPS_RTC_UDR_CON,
121 .autoclear_udr_mask = S2MPS_RTC_WUDR_MASK,
122 .read_time_udr_mask = S2MPS_RTC_RUDR_MASK,
123 .write_time_udr_mask = S2MPS_RTC_WUDR_MASK,
124 .write_alarm_udr_mask = S2MPS_RTC_WUDR_MASK | S2MPS_RTC_RUDR_MASK,
125};
126
127/*
128 * Register map for S2MPS15 - in comparison to S2MPS14 the WUDR and AUDR bits
129 * are swapped.
130 */
131static const struct s5m_rtc_reg_config s2mps15_rtc_regs = {
132 .regs_count = 7,
133 .time = S2MPS_RTC_SEC,
134 .ctrl = S2MPS_RTC_CTRL,
135 .alarm0 = S2MPS_ALARM0_SEC,
136 .alarm1 = S2MPS_ALARM1_SEC,
137 .udr_update = S2MPS_RTC_UDR_CON,
138 .autoclear_udr_mask = S2MPS_RTC_WUDR_MASK,
139 .read_time_udr_mask = S2MPS_RTC_RUDR_MASK,
140 .write_time_udr_mask = S2MPS15_RTC_WUDR_MASK,
141 .write_alarm_udr_mask = S2MPS15_RTC_AUDR_MASK,
142};
143
144struct s5m_rtc_info {
145 struct device *dev;
146 struct i2c_client *i2c;
147 struct sec_pmic_dev *s5m87xx;
148 struct regmap *regmap;
149 struct rtc_device *rtc_dev;
150 int irq;
151 enum sec_device_type device_type;
152 int rtc_24hr_mode;
153 const struct s5m_rtc_reg_config *regs;
154};
155
156static const struct regmap_config s5m_rtc_regmap_config = {
157 .reg_bits = 8,
158 .val_bits = 8,
159
160 .max_register = S5M_RTC_REG_MAX,
161};
162
163static const struct regmap_config s2mps14_rtc_regmap_config = {
164 .reg_bits = 8,
165 .val_bits = 8,
166
167 .max_register = S2MPS_RTC_REG_MAX,
168};
169
170static void s5m8767_data_to_tm(u8 *data, struct rtc_time *tm,
171 int rtc_24hr_mode)
172{
173 tm->tm_sec = data[RTC_SEC] & 0x7f;
174 tm->tm_min = data[RTC_MIN] & 0x7f;
175 if (rtc_24hr_mode) {
176 tm->tm_hour = data[RTC_HOUR] & 0x1f;
177 } else {
178 tm->tm_hour = data[RTC_HOUR] & 0x0f;
179 if (data[RTC_HOUR] & HOUR_PM_MASK)
180 tm->tm_hour += 12;
181 }
182
183 tm->tm_wday = ffs(data[RTC_WEEKDAY] & 0x7f);
184 tm->tm_mday = data[RTC_DATE] & 0x1f;
185 tm->tm_mon = (data[RTC_MONTH] & 0x0f) - 1;
186 tm->tm_year = (data[RTC_YEAR1] & 0x7f) + 100;
187 tm->tm_yday = 0;
188 tm->tm_isdst = 0;
189}
190
191static int s5m8767_tm_to_data(struct rtc_time *tm, u8 *data)
192{
193 data[RTC_SEC] = tm->tm_sec;
194 data[RTC_MIN] = tm->tm_min;
195
196 if (tm->tm_hour >= 12)
197 data[RTC_HOUR] = tm->tm_hour | HOUR_PM_MASK;
198 else
199 data[RTC_HOUR] = tm->tm_hour & ~HOUR_PM_MASK;
200
201 data[RTC_WEEKDAY] = 1 << tm->tm_wday;
202 data[RTC_DATE] = tm->tm_mday;
203 data[RTC_MONTH] = tm->tm_mon + 1;
204 data[RTC_YEAR1] = tm->tm_year > 100 ? (tm->tm_year - 100) : 0;
205
206 if (tm->tm_year < 100) {
207 pr_err("RTC cannot handle the year %d\n",
208 1900 + tm->tm_year);
209 return -EINVAL;
210 } else {
211 return 0;
212 }
213}
214
215/*
216 * Read RTC_UDR_CON register and wait till UDR field is cleared.
217 * This indicates that time/alarm update ended.
218 */
219static int s5m8767_wait_for_udr_update(struct s5m_rtc_info *info)
220{
221 int ret, retry = UDR_READ_RETRY_CNT;
222 unsigned int data;
223
224 do {
225 ret = regmap_read(info->regmap, info->regs->udr_update, &data);
226 } while (--retry && (data & info->regs->autoclear_udr_mask) && !ret);
227
228 if (!retry)
229 dev_err(info->dev, "waiting for UDR update, reached max number of retries\n");
230
231 return ret;
232}
233
234static int s5m_check_peding_alarm_interrupt(struct s5m_rtc_info *info,
235 struct rtc_wkalrm *alarm)
236{
237 int ret;
238 unsigned int val;
239
240 switch (info->device_type) {
241 case S5M8767X:
242 case S5M8763X:
243 ret = regmap_read(info->regmap, S5M_RTC_STATUS, &val);
244 val &= S5M_ALARM0_STATUS;
245 break;
246 case S2MPS15X:
247 case S2MPS14X:
248 case S2MPS13X:
249 ret = regmap_read(info->s5m87xx->regmap_pmic, S2MPS14_REG_ST2,
250 &val);
251 val &= S2MPS_ALARM0_STATUS;
252 break;
253 default:
254 return -EINVAL;
255 }
256 if (ret < 0)
257 return ret;
258
259 if (val)
260 alarm->pending = 1;
261 else
262 alarm->pending = 0;
263
264 return 0;
265}
266
267static int s5m8767_rtc_set_time_reg(struct s5m_rtc_info *info)
268{
269 int ret;
270 unsigned int data;
271
272 ret = regmap_read(info->regmap, info->regs->udr_update, &data);
273 if (ret < 0) {
274 dev_err(info->dev, "failed to read update reg(%d)\n", ret);
275 return ret;
276 }
277
278 data |= info->regs->write_time_udr_mask;
279
280 ret = regmap_write(info->regmap, info->regs->udr_update, data);
281 if (ret < 0) {
282 dev_err(info->dev, "failed to write update reg(%d)\n", ret);
283 return ret;
284 }
285
286 ret = s5m8767_wait_for_udr_update(info);
287
288 return ret;
289}
290
291static int s5m8767_rtc_set_alarm_reg(struct s5m_rtc_info *info)
292{
293 int ret;
294 unsigned int data;
295
296 ret = regmap_read(info->regmap, info->regs->udr_update, &data);
297 if (ret < 0) {
298 dev_err(info->dev, "%s: fail to read update reg(%d)\n",
299 __func__, ret);
300 return ret;
301 }
302
303 data |= info->regs->write_alarm_udr_mask;
304 switch (info->device_type) {
305 case S5M8763X:
306 case S5M8767X:
307 data &= ~S5M_RTC_TIME_EN_MASK;
308 break;
309 case S2MPS15X:
310 case S2MPS14X:
311 case S2MPS13X:
312 /* No exceptions needed */
313 break;
314 default:
315 return -EINVAL;
316 }
317
318 ret = regmap_write(info->regmap, info->regs->udr_update, data);
319 if (ret < 0) {
320 dev_err(info->dev, "%s: fail to write update reg(%d)\n",
321 __func__, ret);
322 return ret;
323 }
324
325 ret = s5m8767_wait_for_udr_update(info);
326
327 /* On S2MPS13 the AUDR is not auto-cleared */
328 if (info->device_type == S2MPS13X)
329 regmap_update_bits(info->regmap, info->regs->udr_update,
330 S2MPS13_RTC_AUDR_MASK, 0);
331
332 return ret;
333}
334
335static void s5m8763_data_to_tm(u8 *data, struct rtc_time *tm)
336{
337 tm->tm_sec = bcd2bin(data[RTC_SEC]);
338 tm->tm_min = bcd2bin(data[RTC_MIN]);
339
340 if (data[RTC_HOUR] & HOUR_12) {
341 tm->tm_hour = bcd2bin(data[RTC_HOUR] & 0x1f);
342 if (data[RTC_HOUR] & HOUR_PM)
343 tm->tm_hour += 12;
344 } else {
345 tm->tm_hour = bcd2bin(data[RTC_HOUR] & 0x3f);
346 }
347
348 tm->tm_wday = data[RTC_WEEKDAY] & 0x07;
349 tm->tm_mday = bcd2bin(data[RTC_DATE]);
350 tm->tm_mon = bcd2bin(data[RTC_MONTH]);
351 tm->tm_year = bcd2bin(data[RTC_YEAR1]) + bcd2bin(data[RTC_YEAR2]) * 100;
352 tm->tm_year -= 1900;
353}
354
355static void s5m8763_tm_to_data(struct rtc_time *tm, u8 *data)
356{
357 data[RTC_SEC] = bin2bcd(tm->tm_sec);
358 data[RTC_MIN] = bin2bcd(tm->tm_min);
359 data[RTC_HOUR] = bin2bcd(tm->tm_hour);
360 data[RTC_WEEKDAY] = tm->tm_wday;
361 data[RTC_DATE] = bin2bcd(tm->tm_mday);
362 data[RTC_MONTH] = bin2bcd(tm->tm_mon);
363 data[RTC_YEAR1] = bin2bcd(tm->tm_year % 100);
364 data[RTC_YEAR2] = bin2bcd((tm->tm_year + 1900) / 100);
365}
366
367static int s5m_rtc_read_time(struct device *dev, struct rtc_time *tm)
368{
369 struct s5m_rtc_info *info = dev_get_drvdata(dev);
370 u8 data[info->regs->regs_count];
371 int ret;
372
373 if (info->regs->read_time_udr_mask) {
374 ret = regmap_update_bits(info->regmap,
375 info->regs->udr_update,
376 info->regs->read_time_udr_mask,
377 info->regs->read_time_udr_mask);
378 if (ret) {
379 dev_err(dev,
380 "Failed to prepare registers for time reading: %d\n",
381 ret);
382 return ret;
383 }
384 }
385 ret = regmap_bulk_read(info->regmap, info->regs->time, data,
386 info->regs->regs_count);
387 if (ret < 0)
388 return ret;
389
390 switch (info->device_type) {
391 case S5M8763X:
392 s5m8763_data_to_tm(data, tm);
393 break;
394
395 case S5M8767X:
396 case S2MPS15X:
397 case S2MPS14X:
398 case S2MPS13X:
399 s5m8767_data_to_tm(data, tm, info->rtc_24hr_mode);
400 break;
401
402 default:
403 return -EINVAL;
404 }
405
406 dev_dbg(dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
407 1900 + tm->tm_year, 1 + tm->tm_mon, tm->tm_mday,
408 tm->tm_hour, tm->tm_min, tm->tm_sec, tm->tm_wday);
409
410 return rtc_valid_tm(tm);
411}
412
413static int s5m_rtc_set_time(struct device *dev, struct rtc_time *tm)
414{
415 struct s5m_rtc_info *info = dev_get_drvdata(dev);
416 u8 data[info->regs->regs_count];
417 int ret = 0;
418
419 switch (info->device_type) {
420 case S5M8763X:
421 s5m8763_tm_to_data(tm, data);
422 break;
423 case S5M8767X:
424 case S2MPS15X:
425 case S2MPS14X:
426 case S2MPS13X:
427 ret = s5m8767_tm_to_data(tm, data);
428 break;
429 default:
430 return -EINVAL;
431 }
432
433 if (ret < 0)
434 return ret;
435
436 dev_dbg(dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
437 1900 + tm->tm_year, 1 + tm->tm_mon, tm->tm_mday,
438 tm->tm_hour, tm->tm_min, tm->tm_sec, tm->tm_wday);
439
440 ret = regmap_raw_write(info->regmap, info->regs->time, data,
441 info->regs->regs_count);
442 if (ret < 0)
443 return ret;
444
445 ret = s5m8767_rtc_set_time_reg(info);
446
447 return ret;
448}
449
450static int s5m_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
451{
452 struct s5m_rtc_info *info = dev_get_drvdata(dev);
453 u8 data[info->regs->regs_count];
454 unsigned int val;
455 int ret, i;
456
457 ret = regmap_bulk_read(info->regmap, info->regs->alarm0, data,
458 info->regs->regs_count);
459 if (ret < 0)
460 return ret;
461
462 switch (info->device_type) {
463 case S5M8763X:
464 s5m8763_data_to_tm(data, &alrm->time);
465 ret = regmap_read(info->regmap, S5M_ALARM0_CONF, &val);
466 if (ret < 0)
467 return ret;
468
469 alrm->enabled = !!val;
470 break;
471
472 case S5M8767X:
473 case S2MPS15X:
474 case S2MPS14X:
475 case S2MPS13X:
476 s5m8767_data_to_tm(data, &alrm->time, info->rtc_24hr_mode);
477 alrm->enabled = 0;
478 for (i = 0; i < info->regs->regs_count; i++) {
479 if (data[i] & ALARM_ENABLE_MASK) {
480 alrm->enabled = 1;
481 break;
482 }
483 }
484 break;
485
486 default:
487 return -EINVAL;
488 }
489
490 dev_dbg(dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
491 1900 + alrm->time.tm_year, 1 + alrm->time.tm_mon,
492 alrm->time.tm_mday, alrm->time.tm_hour,
493 alrm->time.tm_min, alrm->time.tm_sec,
494 alrm->time.tm_wday);
495
496 ret = s5m_check_peding_alarm_interrupt(info, alrm);
497
498 return 0;
499}
500
501static int s5m_rtc_stop_alarm(struct s5m_rtc_info *info)
502{
503 u8 data[info->regs->regs_count];
504 int ret, i;
505 struct rtc_time tm;
506
507 ret = regmap_bulk_read(info->regmap, info->regs->alarm0, data,
508 info->regs->regs_count);
509 if (ret < 0)
510 return ret;
511
512 s5m8767_data_to_tm(data, &tm, info->rtc_24hr_mode);
513 dev_dbg(info->dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
514 1900 + tm.tm_year, 1 + tm.tm_mon, tm.tm_mday,
515 tm.tm_hour, tm.tm_min, tm.tm_sec, tm.tm_wday);
516
517 switch (info->device_type) {
518 case S5M8763X:
519 ret = regmap_write(info->regmap, S5M_ALARM0_CONF, 0);
520 break;
521
522 case S5M8767X:
523 case S2MPS15X:
524 case S2MPS14X:
525 case S2MPS13X:
526 for (i = 0; i < info->regs->regs_count; i++)
527 data[i] &= ~ALARM_ENABLE_MASK;
528
529 ret = regmap_raw_write(info->regmap, info->regs->alarm0, data,
530 info->regs->regs_count);
531 if (ret < 0)
532 return ret;
533
534 ret = s5m8767_rtc_set_alarm_reg(info);
535
536 break;
537
538 default:
539 return -EINVAL;
540 }
541
542 return ret;
543}
544
545static int s5m_rtc_start_alarm(struct s5m_rtc_info *info)
546{
547 int ret;
548 u8 data[info->regs->regs_count];
549 u8 alarm0_conf;
550 struct rtc_time tm;
551
552 ret = regmap_bulk_read(info->regmap, info->regs->alarm0, data,
553 info->regs->regs_count);
554 if (ret < 0)
555 return ret;
556
557 s5m8767_data_to_tm(data, &tm, info->rtc_24hr_mode);
558 dev_dbg(info->dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
559 1900 + tm.tm_year, 1 + tm.tm_mon, tm.tm_mday,
560 tm.tm_hour, tm.tm_min, tm.tm_sec, tm.tm_wday);
561
562 switch (info->device_type) {
563 case S5M8763X:
564 alarm0_conf = 0x77;
565 ret = regmap_write(info->regmap, S5M_ALARM0_CONF, alarm0_conf);
566 break;
567
568 case S5M8767X:
569 case S2MPS15X:
570 case S2MPS14X:
571 case S2MPS13X:
572 data[RTC_SEC] |= ALARM_ENABLE_MASK;
573 data[RTC_MIN] |= ALARM_ENABLE_MASK;
574 data[RTC_HOUR] |= ALARM_ENABLE_MASK;
575 data[RTC_WEEKDAY] &= ~ALARM_ENABLE_MASK;
576 if (data[RTC_DATE] & 0x1f)
577 data[RTC_DATE] |= ALARM_ENABLE_MASK;
578 if (data[RTC_MONTH] & 0xf)
579 data[RTC_MONTH] |= ALARM_ENABLE_MASK;
580 if (data[RTC_YEAR1] & 0x7f)
581 data[RTC_YEAR1] |= ALARM_ENABLE_MASK;
582
583 ret = regmap_raw_write(info->regmap, info->regs->alarm0, data,
584 info->regs->regs_count);
585 if (ret < 0)
586 return ret;
587 ret = s5m8767_rtc_set_alarm_reg(info);
588
589 break;
590
591 default:
592 return -EINVAL;
593 }
594
595 return ret;
596}
597
598static int s5m_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
599{
600 struct s5m_rtc_info *info = dev_get_drvdata(dev);
601 u8 data[info->regs->regs_count];
602 int ret;
603
604 switch (info->device_type) {
605 case S5M8763X:
606 s5m8763_tm_to_data(&alrm->time, data);
607 break;
608
609 case S5M8767X:
610 case S2MPS15X:
611 case S2MPS14X:
612 case S2MPS13X:
613 s5m8767_tm_to_data(&alrm->time, data);
614 break;
615
616 default:
617 return -EINVAL;
618 }
619
620 dev_dbg(dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
621 1900 + alrm->time.tm_year, 1 + alrm->time.tm_mon,
622 alrm->time.tm_mday, alrm->time.tm_hour, alrm->time.tm_min,
623 alrm->time.tm_sec, alrm->time.tm_wday);
624
625 ret = s5m_rtc_stop_alarm(info);
626 if (ret < 0)
627 return ret;
628
629 ret = regmap_raw_write(info->regmap, info->regs->alarm0, data,
630 info->regs->regs_count);
631 if (ret < 0)
632 return ret;
633
634 ret = s5m8767_rtc_set_alarm_reg(info);
635 if (ret < 0)
636 return ret;
637
638 if (alrm->enabled)
639 ret = s5m_rtc_start_alarm(info);
640
641 return ret;
642}
643
644static int s5m_rtc_alarm_irq_enable(struct device *dev,
645 unsigned int enabled)
646{
647 struct s5m_rtc_info *info = dev_get_drvdata(dev);
648
649 if (enabled)
650 return s5m_rtc_start_alarm(info);
651 else
652 return s5m_rtc_stop_alarm(info);
653}
654
655static irqreturn_t s5m_rtc_alarm_irq(int irq, void *data)
656{
657 struct s5m_rtc_info *info = data;
658
659 rtc_update_irq(info->rtc_dev, 1, RTC_IRQF | RTC_AF);
660
661 return IRQ_HANDLED;
662}
663
664static const struct rtc_class_ops s5m_rtc_ops = {
665 .read_time = s5m_rtc_read_time,
666 .set_time = s5m_rtc_set_time,
667 .read_alarm = s5m_rtc_read_alarm,
668 .set_alarm = s5m_rtc_set_alarm,
669 .alarm_irq_enable = s5m_rtc_alarm_irq_enable,
670};
671
672static int s5m8767_rtc_init_reg(struct s5m_rtc_info *info)
673{
674 u8 data[2];
675 int ret;
676
677 switch (info->device_type) {
678 case S5M8763X:
679 case S5M8767X:
680 /* UDR update time. Default of 7.32 ms is too long. */
681 ret = regmap_update_bits(info->regmap, S5M_RTC_UDR_CON,
682 S5M_RTC_UDR_T_MASK, S5M_RTC_UDR_T_450_US);
683 if (ret < 0)
684 dev_err(info->dev, "%s: fail to change UDR time: %d\n",
685 __func__, ret);
686
687 /* Set RTC control register : Binary mode, 24hour mode */
688 data[0] = (1 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
689 data[1] = (0 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
690
691 ret = regmap_raw_write(info->regmap, S5M_ALARM0_CONF, data, 2);
692 break;
693
694 case S2MPS15X:
695 case S2MPS14X:
696 case S2MPS13X:
697 data[0] = (0 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
698 ret = regmap_write(info->regmap, info->regs->ctrl, data[0]);
699 if (ret < 0)
700 break;
701
702 /*
703 * Should set WUDR & (RUDR or AUDR) bits to high after writing
704 * RTC_CTRL register like writing Alarm registers. We can't find
705 * the description from datasheet but vendor code does that
706 * really.
707 */
708 ret = s5m8767_rtc_set_alarm_reg(info);
709 break;
710
711 default:
712 return -EINVAL;
713 }
714
715 info->rtc_24hr_mode = 1;
716 if (ret < 0) {
717 dev_err(info->dev, "%s: fail to write controlm reg(%d)\n",
718 __func__, ret);
719 return ret;
720 }
721
722 return ret;
723}
724
725static int s5m_rtc_probe(struct platform_device *pdev)
726{
727 struct sec_pmic_dev *s5m87xx = dev_get_drvdata(pdev->dev.parent);
728 struct sec_platform_data *pdata = s5m87xx->pdata;
729 struct s5m_rtc_info *info;
730 const struct regmap_config *regmap_cfg;
731 int ret, alarm_irq;
732
733 if (!pdata) {
734 dev_err(pdev->dev.parent, "Platform data not supplied\n");
735 return -ENODEV;
736 }
737
738 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
739 if (!info)
740 return -ENOMEM;
741
742 switch (platform_get_device_id(pdev)->driver_data) {
743 case S2MPS15X:
744 regmap_cfg = &s2mps14_rtc_regmap_config;
745 info->regs = &s2mps15_rtc_regs;
746 alarm_irq = S2MPS14_IRQ_RTCA0;
747 break;
748 case S2MPS14X:
749 regmap_cfg = &s2mps14_rtc_regmap_config;
750 info->regs = &s2mps14_rtc_regs;
751 alarm_irq = S2MPS14_IRQ_RTCA0;
752 break;
753 case S2MPS13X:
754 regmap_cfg = &s2mps14_rtc_regmap_config;
755 info->regs = &s2mps13_rtc_regs;
756 alarm_irq = S2MPS14_IRQ_RTCA0;
757 break;
758 case S5M8763X:
759 regmap_cfg = &s5m_rtc_regmap_config;
760 info->regs = &s5m_rtc_regs;
761 alarm_irq = S5M8763_IRQ_ALARM0;
762 break;
763 case S5M8767X:
764 regmap_cfg = &s5m_rtc_regmap_config;
765 info->regs = &s5m_rtc_regs;
766 alarm_irq = S5M8767_IRQ_RTCA1;
767 break;
768 default:
769 dev_err(&pdev->dev,
770 "Device type %lu is not supported by RTC driver\n",
771 platform_get_device_id(pdev)->driver_data);
772 return -ENODEV;
773 }
774
775 info->i2c = i2c_new_dummy(s5m87xx->i2c->adapter, RTC_I2C_ADDR);
776 if (!info->i2c) {
777 dev_err(&pdev->dev, "Failed to allocate I2C for RTC\n");
778 return -ENODEV;
779 }
780
781 info->regmap = devm_regmap_init_i2c(info->i2c, regmap_cfg);
782 if (IS_ERR(info->regmap)) {
783 ret = PTR_ERR(info->regmap);
784 dev_err(&pdev->dev, "Failed to allocate RTC register map: %d\n",
785 ret);
786 goto err;
787 }
788
789 info->dev = &pdev->dev;
790 info->s5m87xx = s5m87xx;
791 info->device_type = platform_get_device_id(pdev)->driver_data;
792
793 if (s5m87xx->irq_data) {
794 info->irq = regmap_irq_get_virq(s5m87xx->irq_data, alarm_irq);
795 if (info->irq <= 0) {
796 ret = -EINVAL;
797 dev_err(&pdev->dev, "Failed to get virtual IRQ %d\n",
798 alarm_irq);
799 goto err;
800 }
801 }
802
803 platform_set_drvdata(pdev, info);
804
805 ret = s5m8767_rtc_init_reg(info);
806
807 device_init_wakeup(&pdev->dev, 1);
808
809 info->rtc_dev = devm_rtc_device_register(&pdev->dev, "s5m-rtc",
810 &s5m_rtc_ops, THIS_MODULE);
811
812 if (IS_ERR(info->rtc_dev)) {
813 ret = PTR_ERR(info->rtc_dev);
814 goto err;
815 }
816
817 if (!info->irq) {
818 dev_info(&pdev->dev, "Alarm IRQ not available\n");
819 return 0;
820 }
821
822 ret = devm_request_threaded_irq(&pdev->dev, info->irq, NULL,
823 s5m_rtc_alarm_irq, 0, "rtc-alarm0",
824 info);
825 if (ret < 0) {
826 dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n",
827 info->irq, ret);
828 goto err;
829 }
830
831 return 0;
832
833err:
834 i2c_unregister_device(info->i2c);
835
836 return ret;
837}
838
839static int s5m_rtc_remove(struct platform_device *pdev)
840{
841 struct s5m_rtc_info *info = platform_get_drvdata(pdev);
842
843 i2c_unregister_device(info->i2c);
844
845 return 0;
846}
847
848#ifdef CONFIG_PM_SLEEP
849static int s5m_rtc_resume(struct device *dev)
850{
851 struct s5m_rtc_info *info = dev_get_drvdata(dev);
852 int ret = 0;
853
854 if (info->irq && device_may_wakeup(dev))
855 ret = disable_irq_wake(info->irq);
856
857 return ret;
858}
859
860static int s5m_rtc_suspend(struct device *dev)
861{
862 struct s5m_rtc_info *info = dev_get_drvdata(dev);
863 int ret = 0;
864
865 if (info->irq && device_may_wakeup(dev))
866 ret = enable_irq_wake(info->irq);
867
868 return ret;
869}
870#endif /* CONFIG_PM_SLEEP */
871
872static SIMPLE_DEV_PM_OPS(s5m_rtc_pm_ops, s5m_rtc_suspend, s5m_rtc_resume);
873
874static const struct platform_device_id s5m_rtc_id[] = {
875 { "s5m-rtc", S5M8767X },
876 { "s2mps13-rtc", S2MPS13X },
877 { "s2mps14-rtc", S2MPS14X },
878 { "s2mps15-rtc", S2MPS15X },
879 { },
880};
881MODULE_DEVICE_TABLE(platform, s5m_rtc_id);
882
883static struct platform_driver s5m_rtc_driver = {
884 .driver = {
885 .name = "s5m-rtc",
886 .pm = &s5m_rtc_pm_ops,
887 },
888 .probe = s5m_rtc_probe,
889 .remove = s5m_rtc_remove,
890 .id_table = s5m_rtc_id,
891};
892
893module_platform_driver(s5m_rtc_driver);
894
895/* Module information */
896MODULE_AUTHOR("Sangbeom Kim <sbkim73@samsung.com>");
897MODULE_DESCRIPTION("Samsung S5M/S2MPS14 RTC driver");
898MODULE_LICENSE("GPL");
899MODULE_ALIAS("platform:s5m-rtc");
1/*
2 * Copyright (c) 2013 Samsung Electronics Co., Ltd
3 * http://www.samsung.com
4 *
5 * Copyright (C) 2013 Google, Inc
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 */
17
18#include <linux/module.h>
19#include <linux/i2c.h>
20#include <linux/slab.h>
21#include <linux/bcd.h>
22#include <linux/bitops.h>
23#include <linux/regmap.h>
24#include <linux/rtc.h>
25#include <linux/delay.h>
26#include <linux/platform_device.h>
27#include <linux/mfd/samsung/core.h>
28#include <linux/mfd/samsung/irq.h>
29#include <linux/mfd/samsung/rtc.h>
30
31/*
32 * Maximum number of retries for checking changes in UDR field
33 * of SEC_RTC_UDR_CON register (to limit possible endless loop).
34 *
35 * After writing to RTC registers (setting time or alarm) read the UDR field
36 * in SEC_RTC_UDR_CON register. UDR is auto-cleared when data have
37 * been transferred.
38 */
39#define UDR_READ_RETRY_CNT 5
40
41struct s5m_rtc_info {
42 struct device *dev;
43 struct sec_pmic_dev *s5m87xx;
44 struct regmap *regmap;
45 struct rtc_device *rtc_dev;
46 int irq;
47 int device_type;
48 int rtc_24hr_mode;
49 bool wtsr_smpl;
50};
51
52static void s5m8767_data_to_tm(u8 *data, struct rtc_time *tm,
53 int rtc_24hr_mode)
54{
55 tm->tm_sec = data[RTC_SEC] & 0x7f;
56 tm->tm_min = data[RTC_MIN] & 0x7f;
57 if (rtc_24hr_mode) {
58 tm->tm_hour = data[RTC_HOUR] & 0x1f;
59 } else {
60 tm->tm_hour = data[RTC_HOUR] & 0x0f;
61 if (data[RTC_HOUR] & HOUR_PM_MASK)
62 tm->tm_hour += 12;
63 }
64
65 tm->tm_wday = ffs(data[RTC_WEEKDAY] & 0x7f);
66 tm->tm_mday = data[RTC_DATE] & 0x1f;
67 tm->tm_mon = (data[RTC_MONTH] & 0x0f) - 1;
68 tm->tm_year = (data[RTC_YEAR1] & 0x7f) + 100;
69 tm->tm_yday = 0;
70 tm->tm_isdst = 0;
71}
72
73static int s5m8767_tm_to_data(struct rtc_time *tm, u8 *data)
74{
75 data[RTC_SEC] = tm->tm_sec;
76 data[RTC_MIN] = tm->tm_min;
77
78 if (tm->tm_hour >= 12)
79 data[RTC_HOUR] = tm->tm_hour | HOUR_PM_MASK;
80 else
81 data[RTC_HOUR] = tm->tm_hour & ~HOUR_PM_MASK;
82
83 data[RTC_WEEKDAY] = 1 << tm->tm_wday;
84 data[RTC_DATE] = tm->tm_mday;
85 data[RTC_MONTH] = tm->tm_mon + 1;
86 data[RTC_YEAR1] = tm->tm_year > 100 ? (tm->tm_year - 100) : 0;
87
88 if (tm->tm_year < 100) {
89 pr_err("s5m8767 RTC cannot handle the year %d.\n",
90 1900 + tm->tm_year);
91 return -EINVAL;
92 } else {
93 return 0;
94 }
95}
96
97/*
98 * Read RTC_UDR_CON register and wait till UDR field is cleared.
99 * This indicates that time/alarm update ended.
100 */
101static inline int s5m8767_wait_for_udr_update(struct s5m_rtc_info *info)
102{
103 int ret, retry = UDR_READ_RETRY_CNT;
104 unsigned int data;
105
106 do {
107 ret = regmap_read(info->regmap, SEC_RTC_UDR_CON, &data);
108 } while (--retry && (data & RTC_UDR_MASK) && !ret);
109
110 if (!retry)
111 dev_err(info->dev, "waiting for UDR update, reached max number of retries\n");
112
113 return ret;
114}
115
116static inline int s5m8767_rtc_set_time_reg(struct s5m_rtc_info *info)
117{
118 int ret;
119 unsigned int data;
120
121 ret = regmap_read(info->regmap, SEC_RTC_UDR_CON, &data);
122 if (ret < 0) {
123 dev_err(info->dev, "failed to read update reg(%d)\n", ret);
124 return ret;
125 }
126
127 data |= RTC_TIME_EN_MASK;
128 data |= RTC_UDR_MASK;
129
130 ret = regmap_write(info->regmap, SEC_RTC_UDR_CON, data);
131 if (ret < 0) {
132 dev_err(info->dev, "failed to write update reg(%d)\n", ret);
133 return ret;
134 }
135
136 ret = s5m8767_wait_for_udr_update(info);
137
138 return ret;
139}
140
141static inline int s5m8767_rtc_set_alarm_reg(struct s5m_rtc_info *info)
142{
143 int ret;
144 unsigned int data;
145
146 ret = regmap_read(info->regmap, SEC_RTC_UDR_CON, &data);
147 if (ret < 0) {
148 dev_err(info->dev, "%s: fail to read update reg(%d)\n",
149 __func__, ret);
150 return ret;
151 }
152
153 data &= ~RTC_TIME_EN_MASK;
154 data |= RTC_UDR_MASK;
155
156 ret = regmap_write(info->regmap, SEC_RTC_UDR_CON, data);
157 if (ret < 0) {
158 dev_err(info->dev, "%s: fail to write update reg(%d)\n",
159 __func__, ret);
160 return ret;
161 }
162
163 ret = s5m8767_wait_for_udr_update(info);
164
165 return ret;
166}
167
168static void s5m8763_data_to_tm(u8 *data, struct rtc_time *tm)
169{
170 tm->tm_sec = bcd2bin(data[RTC_SEC]);
171 tm->tm_min = bcd2bin(data[RTC_MIN]);
172
173 if (data[RTC_HOUR] & HOUR_12) {
174 tm->tm_hour = bcd2bin(data[RTC_HOUR] & 0x1f);
175 if (data[RTC_HOUR] & HOUR_PM)
176 tm->tm_hour += 12;
177 } else {
178 tm->tm_hour = bcd2bin(data[RTC_HOUR] & 0x3f);
179 }
180
181 tm->tm_wday = data[RTC_WEEKDAY] & 0x07;
182 tm->tm_mday = bcd2bin(data[RTC_DATE]);
183 tm->tm_mon = bcd2bin(data[RTC_MONTH]);
184 tm->tm_year = bcd2bin(data[RTC_YEAR1]) + bcd2bin(data[RTC_YEAR2]) * 100;
185 tm->tm_year -= 1900;
186}
187
188static void s5m8763_tm_to_data(struct rtc_time *tm, u8 *data)
189{
190 data[RTC_SEC] = bin2bcd(tm->tm_sec);
191 data[RTC_MIN] = bin2bcd(tm->tm_min);
192 data[RTC_HOUR] = bin2bcd(tm->tm_hour);
193 data[RTC_WEEKDAY] = tm->tm_wday;
194 data[RTC_DATE] = bin2bcd(tm->tm_mday);
195 data[RTC_MONTH] = bin2bcd(tm->tm_mon);
196 data[RTC_YEAR1] = bin2bcd(tm->tm_year % 100);
197 data[RTC_YEAR2] = bin2bcd((tm->tm_year + 1900) / 100);
198}
199
200static int s5m_rtc_read_time(struct device *dev, struct rtc_time *tm)
201{
202 struct s5m_rtc_info *info = dev_get_drvdata(dev);
203 u8 data[8];
204 int ret;
205
206 ret = regmap_bulk_read(info->regmap, SEC_RTC_SEC, data, 8);
207 if (ret < 0)
208 return ret;
209
210 switch (info->device_type) {
211 case S5M8763X:
212 s5m8763_data_to_tm(data, tm);
213 break;
214
215 case S5M8767X:
216 s5m8767_data_to_tm(data, tm, info->rtc_24hr_mode);
217 break;
218
219 default:
220 return -EINVAL;
221 }
222
223 dev_dbg(dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
224 1900 + tm->tm_year, 1 + tm->tm_mon, tm->tm_mday,
225 tm->tm_hour, tm->tm_min, tm->tm_sec, tm->tm_wday);
226
227 return rtc_valid_tm(tm);
228}
229
230static int s5m_rtc_set_time(struct device *dev, struct rtc_time *tm)
231{
232 struct s5m_rtc_info *info = dev_get_drvdata(dev);
233 u8 data[8];
234 int ret = 0;
235
236 switch (info->device_type) {
237 case S5M8763X:
238 s5m8763_tm_to_data(tm, data);
239 break;
240 case S5M8767X:
241 ret = s5m8767_tm_to_data(tm, data);
242 break;
243 default:
244 return -EINVAL;
245 }
246
247 if (ret < 0)
248 return ret;
249
250 dev_dbg(dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
251 1900 + tm->tm_year, 1 + tm->tm_mon, tm->tm_mday,
252 tm->tm_hour, tm->tm_min, tm->tm_sec, tm->tm_wday);
253
254 ret = regmap_raw_write(info->regmap, SEC_RTC_SEC, data, 8);
255 if (ret < 0)
256 return ret;
257
258 ret = s5m8767_rtc_set_time_reg(info);
259
260 return ret;
261}
262
263static int s5m_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
264{
265 struct s5m_rtc_info *info = dev_get_drvdata(dev);
266 u8 data[8];
267 unsigned int val;
268 int ret, i;
269
270 ret = regmap_bulk_read(info->regmap, SEC_ALARM0_SEC, data, 8);
271 if (ret < 0)
272 return ret;
273
274 switch (info->device_type) {
275 case S5M8763X:
276 s5m8763_data_to_tm(data, &alrm->time);
277 ret = regmap_read(info->regmap, SEC_ALARM0_CONF, &val);
278 if (ret < 0)
279 return ret;
280
281 alrm->enabled = !!val;
282
283 ret = regmap_read(info->regmap, SEC_RTC_STATUS, &val);
284 if (ret < 0)
285 return ret;
286
287 break;
288
289 case S5M8767X:
290 s5m8767_data_to_tm(data, &alrm->time, info->rtc_24hr_mode);
291 dev_dbg(dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
292 1900 + alrm->time.tm_year, 1 + alrm->time.tm_mon,
293 alrm->time.tm_mday, alrm->time.tm_hour,
294 alrm->time.tm_min, alrm->time.tm_sec,
295 alrm->time.tm_wday);
296
297 alrm->enabled = 0;
298 for (i = 0; i < 7; i++) {
299 if (data[i] & ALARM_ENABLE_MASK) {
300 alrm->enabled = 1;
301 break;
302 }
303 }
304
305 alrm->pending = 0;
306 ret = regmap_read(info->regmap, SEC_RTC_STATUS, &val);
307 if (ret < 0)
308 return ret;
309 break;
310
311 default:
312 return -EINVAL;
313 }
314
315 if (val & ALARM0_STATUS)
316 alrm->pending = 1;
317 else
318 alrm->pending = 0;
319
320 return 0;
321}
322
323static int s5m_rtc_stop_alarm(struct s5m_rtc_info *info)
324{
325 u8 data[8];
326 int ret, i;
327 struct rtc_time tm;
328
329 ret = regmap_bulk_read(info->regmap, SEC_ALARM0_SEC, data, 8);
330 if (ret < 0)
331 return ret;
332
333 s5m8767_data_to_tm(data, &tm, info->rtc_24hr_mode);
334 dev_dbg(info->dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
335 1900 + tm.tm_year, 1 + tm.tm_mon, tm.tm_mday,
336 tm.tm_hour, tm.tm_min, tm.tm_sec, tm.tm_wday);
337
338 switch (info->device_type) {
339 case S5M8763X:
340 ret = regmap_write(info->regmap, SEC_ALARM0_CONF, 0);
341 break;
342
343 case S5M8767X:
344 for (i = 0; i < 7; i++)
345 data[i] &= ~ALARM_ENABLE_MASK;
346
347 ret = regmap_raw_write(info->regmap, SEC_ALARM0_SEC, data, 8);
348 if (ret < 0)
349 return ret;
350
351 ret = s5m8767_rtc_set_alarm_reg(info);
352
353 break;
354
355 default:
356 return -EINVAL;
357 }
358
359 return ret;
360}
361
362static int s5m_rtc_start_alarm(struct s5m_rtc_info *info)
363{
364 int ret;
365 u8 data[8];
366 u8 alarm0_conf;
367 struct rtc_time tm;
368
369 ret = regmap_bulk_read(info->regmap, SEC_ALARM0_SEC, data, 8);
370 if (ret < 0)
371 return ret;
372
373 s5m8767_data_to_tm(data, &tm, info->rtc_24hr_mode);
374 dev_dbg(info->dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
375 1900 + tm.tm_year, 1 + tm.tm_mon, tm.tm_mday,
376 tm.tm_hour, tm.tm_min, tm.tm_sec, tm.tm_wday);
377
378 switch (info->device_type) {
379 case S5M8763X:
380 alarm0_conf = 0x77;
381 ret = regmap_write(info->regmap, SEC_ALARM0_CONF, alarm0_conf);
382 break;
383
384 case S5M8767X:
385 data[RTC_SEC] |= ALARM_ENABLE_MASK;
386 data[RTC_MIN] |= ALARM_ENABLE_MASK;
387 data[RTC_HOUR] |= ALARM_ENABLE_MASK;
388 data[RTC_WEEKDAY] &= ~ALARM_ENABLE_MASK;
389 if (data[RTC_DATE] & 0x1f)
390 data[RTC_DATE] |= ALARM_ENABLE_MASK;
391 if (data[RTC_MONTH] & 0xf)
392 data[RTC_MONTH] |= ALARM_ENABLE_MASK;
393 if (data[RTC_YEAR1] & 0x7f)
394 data[RTC_YEAR1] |= ALARM_ENABLE_MASK;
395
396 ret = regmap_raw_write(info->regmap, SEC_ALARM0_SEC, data, 8);
397 if (ret < 0)
398 return ret;
399 ret = s5m8767_rtc_set_alarm_reg(info);
400
401 break;
402
403 default:
404 return -EINVAL;
405 }
406
407 return ret;
408}
409
410static int s5m_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
411{
412 struct s5m_rtc_info *info = dev_get_drvdata(dev);
413 u8 data[8];
414 int ret;
415
416 switch (info->device_type) {
417 case S5M8763X:
418 s5m8763_tm_to_data(&alrm->time, data);
419 break;
420
421 case S5M8767X:
422 s5m8767_tm_to_data(&alrm->time, data);
423 break;
424
425 default:
426 return -EINVAL;
427 }
428
429 dev_dbg(dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
430 1900 + alrm->time.tm_year, 1 + alrm->time.tm_mon,
431 alrm->time.tm_mday, alrm->time.tm_hour, alrm->time.tm_min,
432 alrm->time.tm_sec, alrm->time.tm_wday);
433
434 ret = s5m_rtc_stop_alarm(info);
435 if (ret < 0)
436 return ret;
437
438 ret = regmap_raw_write(info->regmap, SEC_ALARM0_SEC, data, 8);
439 if (ret < 0)
440 return ret;
441
442 ret = s5m8767_rtc_set_alarm_reg(info);
443 if (ret < 0)
444 return ret;
445
446 if (alrm->enabled)
447 ret = s5m_rtc_start_alarm(info);
448
449 return ret;
450}
451
452static int s5m_rtc_alarm_irq_enable(struct device *dev,
453 unsigned int enabled)
454{
455 struct s5m_rtc_info *info = dev_get_drvdata(dev);
456
457 if (enabled)
458 return s5m_rtc_start_alarm(info);
459 else
460 return s5m_rtc_stop_alarm(info);
461}
462
463static irqreturn_t s5m_rtc_alarm_irq(int irq, void *data)
464{
465 struct s5m_rtc_info *info = data;
466
467 rtc_update_irq(info->rtc_dev, 1, RTC_IRQF | RTC_AF);
468
469 return IRQ_HANDLED;
470}
471
472static const struct rtc_class_ops s5m_rtc_ops = {
473 .read_time = s5m_rtc_read_time,
474 .set_time = s5m_rtc_set_time,
475 .read_alarm = s5m_rtc_read_alarm,
476 .set_alarm = s5m_rtc_set_alarm,
477 .alarm_irq_enable = s5m_rtc_alarm_irq_enable,
478};
479
480static void s5m_rtc_enable_wtsr(struct s5m_rtc_info *info, bool enable)
481{
482 int ret;
483 ret = regmap_update_bits(info->regmap, SEC_WTSR_SMPL_CNTL,
484 WTSR_ENABLE_MASK,
485 enable ? WTSR_ENABLE_MASK : 0);
486 if (ret < 0)
487 dev_err(info->dev, "%s: fail to update WTSR reg(%d)\n",
488 __func__, ret);
489}
490
491static void s5m_rtc_enable_smpl(struct s5m_rtc_info *info, bool enable)
492{
493 int ret;
494 ret = regmap_update_bits(info->regmap, SEC_WTSR_SMPL_CNTL,
495 SMPL_ENABLE_MASK,
496 enable ? SMPL_ENABLE_MASK : 0);
497 if (ret < 0)
498 dev_err(info->dev, "%s: fail to update SMPL reg(%d)\n",
499 __func__, ret);
500}
501
502static int s5m8767_rtc_init_reg(struct s5m_rtc_info *info)
503{
504 u8 data[2];
505 unsigned int tp_read;
506 int ret;
507 struct rtc_time tm;
508
509 ret = regmap_read(info->regmap, SEC_RTC_UDR_CON, &tp_read);
510 if (ret < 0) {
511 dev_err(info->dev, "%s: fail to read control reg(%d)\n",
512 __func__, ret);
513 return ret;
514 }
515
516 /* Set RTC control register : Binary mode, 24hour mode */
517 data[0] = (1 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
518 data[1] = (0 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
519
520 info->rtc_24hr_mode = 1;
521 ret = regmap_raw_write(info->regmap, SEC_ALARM0_CONF, data, 2);
522 if (ret < 0) {
523 dev_err(info->dev, "%s: fail to write controlm reg(%d)\n",
524 __func__, ret);
525 return ret;
526 }
527
528 /* In first boot time, Set rtc time to 1/1/2012 00:00:00(SUN) */
529 if ((tp_read & RTC_TCON_MASK) == 0) {
530 dev_dbg(info->dev, "rtc init\n");
531 tm.tm_sec = 0;
532 tm.tm_min = 0;
533 tm.tm_hour = 0;
534 tm.tm_wday = 0;
535 tm.tm_mday = 1;
536 tm.tm_mon = 0;
537 tm.tm_year = 112;
538 tm.tm_yday = 0;
539 tm.tm_isdst = 0;
540 ret = s5m_rtc_set_time(info->dev, &tm);
541 }
542
543 ret = regmap_update_bits(info->regmap, SEC_RTC_UDR_CON,
544 RTC_TCON_MASK, tp_read | RTC_TCON_MASK);
545 if (ret < 0)
546 dev_err(info->dev, "%s: fail to update TCON reg(%d)\n",
547 __func__, ret);
548
549 return ret;
550}
551
552static int s5m_rtc_probe(struct platform_device *pdev)
553{
554 struct sec_pmic_dev *s5m87xx = dev_get_drvdata(pdev->dev.parent);
555 struct sec_platform_data *pdata = s5m87xx->pdata;
556 struct s5m_rtc_info *info;
557 int ret;
558
559 if (!pdata) {
560 dev_err(pdev->dev.parent, "Platform data not supplied\n");
561 return -ENODEV;
562 }
563
564 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
565 if (!info)
566 return -ENOMEM;
567
568 info->dev = &pdev->dev;
569 info->s5m87xx = s5m87xx;
570 info->regmap = s5m87xx->regmap_rtc;
571 info->device_type = s5m87xx->device_type;
572 info->wtsr_smpl = s5m87xx->wtsr_smpl;
573
574 switch (pdata->device_type) {
575 case S5M8763X:
576 info->irq = regmap_irq_get_virq(s5m87xx->irq_data,
577 S5M8763_IRQ_ALARM0);
578 break;
579
580 case S5M8767X:
581 info->irq = regmap_irq_get_virq(s5m87xx->irq_data,
582 S5M8767_IRQ_RTCA1);
583 break;
584
585 default:
586 ret = -EINVAL;
587 dev_err(&pdev->dev, "Unsupported device type: %d\n", ret);
588 return ret;
589 }
590
591 platform_set_drvdata(pdev, info);
592
593 ret = s5m8767_rtc_init_reg(info);
594
595 if (info->wtsr_smpl) {
596 s5m_rtc_enable_wtsr(info, true);
597 s5m_rtc_enable_smpl(info, true);
598 }
599
600 device_init_wakeup(&pdev->dev, 1);
601
602 info->rtc_dev = devm_rtc_device_register(&pdev->dev, "s5m-rtc",
603 &s5m_rtc_ops, THIS_MODULE);
604
605 if (IS_ERR(info->rtc_dev))
606 return PTR_ERR(info->rtc_dev);
607
608 ret = devm_request_threaded_irq(&pdev->dev, info->irq, NULL,
609 s5m_rtc_alarm_irq, 0, "rtc-alarm0",
610 info);
611 if (ret < 0)
612 dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n",
613 info->irq, ret);
614
615 return ret;
616}
617
618static void s5m_rtc_shutdown(struct platform_device *pdev)
619{
620 struct s5m_rtc_info *info = platform_get_drvdata(pdev);
621 int i;
622 unsigned int val = 0;
623 if (info->wtsr_smpl) {
624 for (i = 0; i < 3; i++) {
625 s5m_rtc_enable_wtsr(info, false);
626 regmap_read(info->regmap, SEC_WTSR_SMPL_CNTL, &val);
627 pr_debug("%s: WTSR_SMPL reg(0x%02x)\n", __func__, val);
628 if (val & WTSR_ENABLE_MASK)
629 pr_emerg("%s: fail to disable WTSR\n",
630 __func__);
631 else {
632 pr_info("%s: success to disable WTSR\n",
633 __func__);
634 break;
635 }
636 }
637 }
638 /* Disable SMPL when power off */
639 s5m_rtc_enable_smpl(info, false);
640}
641
642#ifdef CONFIG_PM_SLEEP
643static int s5m_rtc_resume(struct device *dev)
644{
645 struct s5m_rtc_info *info = dev_get_drvdata(dev);
646 int ret = 0;
647
648 if (device_may_wakeup(dev))
649 ret = disable_irq_wake(info->irq);
650
651 return ret;
652}
653
654static int s5m_rtc_suspend(struct device *dev)
655{
656 struct s5m_rtc_info *info = dev_get_drvdata(dev);
657 int ret = 0;
658
659 if (device_may_wakeup(dev))
660 ret = enable_irq_wake(info->irq);
661
662 return ret;
663}
664#endif /* CONFIG_PM_SLEEP */
665
666static SIMPLE_DEV_PM_OPS(s5m_rtc_pm_ops, s5m_rtc_suspend, s5m_rtc_resume);
667
668static const struct platform_device_id s5m_rtc_id[] = {
669 { "s5m-rtc", 0 },
670};
671
672static struct platform_driver s5m_rtc_driver = {
673 .driver = {
674 .name = "s5m-rtc",
675 .owner = THIS_MODULE,
676 .pm = &s5m_rtc_pm_ops,
677 },
678 .probe = s5m_rtc_probe,
679 .shutdown = s5m_rtc_shutdown,
680 .id_table = s5m_rtc_id,
681};
682
683module_platform_driver(s5m_rtc_driver);
684
685/* Module information */
686MODULE_AUTHOR("Sangbeom Kim <sbkim73@samsung.com>");
687MODULE_DESCRIPTION("Samsung S5M RTC driver");
688MODULE_LICENSE("GPL");
689MODULE_ALIAS("platform:s5m-rtc");