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1// SPDX-License-Identifier: GPL-2.0-only
2/* drivers/rtc/rtc-s3c.c
3 *
4 * Copyright (c) 2010 Samsung Electronics Co., Ltd.
5 * http://www.samsung.com/
6 *
7 * Copyright (c) 2004,2006 Simtec Electronics
8 * Ben Dooks, <ben@simtec.co.uk>
9 * http://armlinux.simtec.co.uk/
10 *
11 * S3C2410/S3C2440/S3C24XX Internal RTC Driver
12*/
13
14#include <linux/module.h>
15#include <linux/fs.h>
16#include <linux/string.h>
17#include <linux/init.h>
18#include <linux/platform_device.h>
19#include <linux/interrupt.h>
20#include <linux/rtc.h>
21#include <linux/bcd.h>
22#include <linux/clk.h>
23#include <linux/log2.h>
24#include <linux/slab.h>
25#include <linux/of.h>
26#include <linux/of_device.h>
27#include <linux/uaccess.h>
28#include <linux/io.h>
29
30#include <asm/irq.h>
31#include "rtc-s3c.h"
32
33struct s3c_rtc {
34 struct device *dev;
35 struct rtc_device *rtc;
36
37 void __iomem *base;
38 struct clk *rtc_clk;
39 struct clk *rtc_src_clk;
40 bool alarm_enabled;
41
42 const struct s3c_rtc_data *data;
43
44 int irq_alarm;
45 int irq_tick;
46
47 spinlock_t pie_lock;
48 spinlock_t alarm_lock;
49
50 int ticnt_save;
51 int ticnt_en_save;
52 bool wake_en;
53};
54
55struct s3c_rtc_data {
56 int max_user_freq;
57 bool needs_src_clk;
58
59 void (*irq_handler) (struct s3c_rtc *info, int mask);
60 void (*set_freq) (struct s3c_rtc *info, int freq);
61 void (*enable_tick) (struct s3c_rtc *info, struct seq_file *seq);
62 void (*select_tick_clk) (struct s3c_rtc *info);
63 void (*save_tick_cnt) (struct s3c_rtc *info);
64 void (*restore_tick_cnt) (struct s3c_rtc *info);
65 void (*enable) (struct s3c_rtc *info);
66 void (*disable) (struct s3c_rtc *info);
67};
68
69static int s3c_rtc_enable_clk(struct s3c_rtc *info)
70{
71 int ret;
72
73 ret = clk_enable(info->rtc_clk);
74 if (ret)
75 return ret;
76
77 if (info->data->needs_src_clk) {
78 ret = clk_enable(info->rtc_src_clk);
79 if (ret) {
80 clk_disable(info->rtc_clk);
81 return ret;
82 }
83 }
84 return 0;
85}
86
87static void s3c_rtc_disable_clk(struct s3c_rtc *info)
88{
89 if (info->data->needs_src_clk)
90 clk_disable(info->rtc_src_clk);
91 clk_disable(info->rtc_clk);
92}
93
94/* IRQ Handlers */
95static irqreturn_t s3c_rtc_tickirq(int irq, void *id)
96{
97 struct s3c_rtc *info = (struct s3c_rtc *)id;
98
99 if (info->data->irq_handler)
100 info->data->irq_handler(info, S3C2410_INTP_TIC);
101
102 return IRQ_HANDLED;
103}
104
105static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)
106{
107 struct s3c_rtc *info = (struct s3c_rtc *)id;
108
109 if (info->data->irq_handler)
110 info->data->irq_handler(info, S3C2410_INTP_ALM);
111
112 return IRQ_HANDLED;
113}
114
115/* Update control registers */
116static int s3c_rtc_setaie(struct device *dev, unsigned int enabled)
117{
118 struct s3c_rtc *info = dev_get_drvdata(dev);
119 unsigned long flags;
120 unsigned int tmp;
121 int ret;
122
123 dev_dbg(info->dev, "%s: aie=%d\n", __func__, enabled);
124
125 ret = s3c_rtc_enable_clk(info);
126 if (ret)
127 return ret;
128
129 tmp = readb(info->base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
130
131 if (enabled)
132 tmp |= S3C2410_RTCALM_ALMEN;
133
134 writeb(tmp, info->base + S3C2410_RTCALM);
135
136 spin_lock_irqsave(&info->alarm_lock, flags);
137
138 if (info->alarm_enabled && !enabled)
139 s3c_rtc_disable_clk(info);
140 else if (!info->alarm_enabled && enabled)
141 ret = s3c_rtc_enable_clk(info);
142
143 info->alarm_enabled = enabled;
144 spin_unlock_irqrestore(&info->alarm_lock, flags);
145
146 s3c_rtc_disable_clk(info);
147
148 return ret;
149}
150
151/* Set RTC frequency */
152static int s3c_rtc_setfreq(struct s3c_rtc *info, int freq)
153{
154 int ret;
155
156 if (!is_power_of_2(freq))
157 return -EINVAL;
158
159 ret = s3c_rtc_enable_clk(info);
160 if (ret)
161 return ret;
162 spin_lock_irq(&info->pie_lock);
163
164 if (info->data->set_freq)
165 info->data->set_freq(info, freq);
166
167 spin_unlock_irq(&info->pie_lock);
168 s3c_rtc_disable_clk(info);
169
170 return 0;
171}
172
173/* Time read/write */
174static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
175{
176 struct s3c_rtc *info = dev_get_drvdata(dev);
177 unsigned int have_retried = 0;
178 int ret;
179
180 ret = s3c_rtc_enable_clk(info);
181 if (ret)
182 return ret;
183
184retry_get_time:
185 rtc_tm->tm_min = readb(info->base + S3C2410_RTCMIN);
186 rtc_tm->tm_hour = readb(info->base + S3C2410_RTCHOUR);
187 rtc_tm->tm_mday = readb(info->base + S3C2410_RTCDATE);
188 rtc_tm->tm_mon = readb(info->base + S3C2410_RTCMON);
189 rtc_tm->tm_year = readb(info->base + S3C2410_RTCYEAR);
190 rtc_tm->tm_sec = readb(info->base + S3C2410_RTCSEC);
191
192 /* the only way to work out whether the system was mid-update
193 * when we read it is to check the second counter, and if it
194 * is zero, then we re-try the entire read
195 */
196
197 if (rtc_tm->tm_sec == 0 && !have_retried) {
198 have_retried = 1;
199 goto retry_get_time;
200 }
201
202 rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
203 rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
204 rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
205 rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
206 rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
207 rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);
208
209 s3c_rtc_disable_clk(info);
210
211 rtc_tm->tm_year += 100;
212 rtc_tm->tm_mon -= 1;
213
214 dev_dbg(dev, "read time %ptR\n", rtc_tm);
215 return 0;
216}
217
218static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
219{
220 struct s3c_rtc *info = dev_get_drvdata(dev);
221 int year = tm->tm_year - 100;
222 int ret;
223
224 dev_dbg(dev, "set time %ptR\n", tm);
225
226 /* we get around y2k by simply not supporting it */
227
228 if (year < 0 || year >= 100) {
229 dev_err(dev, "rtc only supports 100 years\n");
230 return -EINVAL;
231 }
232
233 ret = s3c_rtc_enable_clk(info);
234 if (ret)
235 return ret;
236
237 writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_RTCSEC);
238 writeb(bin2bcd(tm->tm_min), info->base + S3C2410_RTCMIN);
239 writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_RTCHOUR);
240 writeb(bin2bcd(tm->tm_mday), info->base + S3C2410_RTCDATE);
241 writeb(bin2bcd(tm->tm_mon + 1), info->base + S3C2410_RTCMON);
242 writeb(bin2bcd(year), info->base + S3C2410_RTCYEAR);
243
244 s3c_rtc_disable_clk(info);
245
246 return 0;
247}
248
249static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
250{
251 struct s3c_rtc *info = dev_get_drvdata(dev);
252 struct rtc_time *alm_tm = &alrm->time;
253 unsigned int alm_en;
254 int ret;
255
256 ret = s3c_rtc_enable_clk(info);
257 if (ret)
258 return ret;
259
260 alm_tm->tm_sec = readb(info->base + S3C2410_ALMSEC);
261 alm_tm->tm_min = readb(info->base + S3C2410_ALMMIN);
262 alm_tm->tm_hour = readb(info->base + S3C2410_ALMHOUR);
263 alm_tm->tm_mon = readb(info->base + S3C2410_ALMMON);
264 alm_tm->tm_mday = readb(info->base + S3C2410_ALMDATE);
265 alm_tm->tm_year = readb(info->base + S3C2410_ALMYEAR);
266
267 alm_en = readb(info->base + S3C2410_RTCALM);
268
269 s3c_rtc_disable_clk(info);
270
271 alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0;
272
273 dev_dbg(dev, "read alarm %d, %ptR\n", alm_en, alm_tm);
274
275 /* decode the alarm enable field */
276 if (alm_en & S3C2410_RTCALM_SECEN)
277 alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec);
278
279 if (alm_en & S3C2410_RTCALM_MINEN)
280 alm_tm->tm_min = bcd2bin(alm_tm->tm_min);
281
282 if (alm_en & S3C2410_RTCALM_HOUREN)
283 alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour);
284
285 if (alm_en & S3C2410_RTCALM_DAYEN)
286 alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday);
287
288 if (alm_en & S3C2410_RTCALM_MONEN) {
289 alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon);
290 alm_tm->tm_mon -= 1;
291 }
292
293 if (alm_en & S3C2410_RTCALM_YEAREN)
294 alm_tm->tm_year = bcd2bin(alm_tm->tm_year);
295
296 return 0;
297}
298
299static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
300{
301 struct s3c_rtc *info = dev_get_drvdata(dev);
302 struct rtc_time *tm = &alrm->time;
303 unsigned int alrm_en;
304 int ret;
305
306 dev_dbg(dev, "s3c_rtc_setalarm: %d, %ptR\n", alrm->enabled, tm);
307
308 ret = s3c_rtc_enable_clk(info);
309 if (ret)
310 return ret;
311
312 alrm_en = readb(info->base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
313 writeb(0x00, info->base + S3C2410_RTCALM);
314
315 if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
316 alrm_en |= S3C2410_RTCALM_SECEN;
317 writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_ALMSEC);
318 }
319
320 if (tm->tm_min < 60 && tm->tm_min >= 0) {
321 alrm_en |= S3C2410_RTCALM_MINEN;
322 writeb(bin2bcd(tm->tm_min), info->base + S3C2410_ALMMIN);
323 }
324
325 if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
326 alrm_en |= S3C2410_RTCALM_HOUREN;
327 writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_ALMHOUR);
328 }
329
330 if (tm->tm_mon < 12 && tm->tm_mon >= 0) {
331 alrm_en |= S3C2410_RTCALM_MONEN;
332 writeb(bin2bcd(tm->tm_mon + 1), info->base + S3C2410_ALMMON);
333 }
334
335 if (tm->tm_mday <= 31 && tm->tm_mday >= 1) {
336 alrm_en |= S3C2410_RTCALM_DAYEN;
337 writeb(bin2bcd(tm->tm_mday), info->base + S3C2410_ALMDATE);
338 }
339
340 dev_dbg(dev, "setting S3C2410_RTCALM to %08x\n", alrm_en);
341
342 writeb(alrm_en, info->base + S3C2410_RTCALM);
343
344 s3c_rtc_setaie(dev, alrm->enabled);
345
346 s3c_rtc_disable_clk(info);
347
348 return 0;
349}
350
351static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
352{
353 struct s3c_rtc *info = dev_get_drvdata(dev);
354 int ret;
355
356 ret = s3c_rtc_enable_clk(info);
357 if (ret)
358 return ret;
359
360 if (info->data->enable_tick)
361 info->data->enable_tick(info, seq);
362
363 s3c_rtc_disable_clk(info);
364
365 return 0;
366}
367
368static const struct rtc_class_ops s3c_rtcops = {
369 .read_time = s3c_rtc_gettime,
370 .set_time = s3c_rtc_settime,
371 .read_alarm = s3c_rtc_getalarm,
372 .set_alarm = s3c_rtc_setalarm,
373 .proc = s3c_rtc_proc,
374 .alarm_irq_enable = s3c_rtc_setaie,
375};
376
377static void s3c24xx_rtc_enable(struct s3c_rtc *info)
378{
379 unsigned int con, tmp;
380
381 con = readw(info->base + S3C2410_RTCCON);
382 /* re-enable the device, and check it is ok */
383 if ((con & S3C2410_RTCCON_RTCEN) == 0) {
384 dev_info(info->dev, "rtc disabled, re-enabling\n");
385
386 tmp = readw(info->base + S3C2410_RTCCON);
387 writew(tmp | S3C2410_RTCCON_RTCEN, info->base + S3C2410_RTCCON);
388 }
389
390 if (con & S3C2410_RTCCON_CNTSEL) {
391 dev_info(info->dev, "removing RTCCON_CNTSEL\n");
392
393 tmp = readw(info->base + S3C2410_RTCCON);
394 writew(tmp & ~S3C2410_RTCCON_CNTSEL,
395 info->base + S3C2410_RTCCON);
396 }
397
398 if (con & S3C2410_RTCCON_CLKRST) {
399 dev_info(info->dev, "removing RTCCON_CLKRST\n");
400
401 tmp = readw(info->base + S3C2410_RTCCON);
402 writew(tmp & ~S3C2410_RTCCON_CLKRST,
403 info->base + S3C2410_RTCCON);
404 }
405}
406
407static void s3c24xx_rtc_disable(struct s3c_rtc *info)
408{
409 unsigned int con;
410
411 con = readw(info->base + S3C2410_RTCCON);
412 con &= ~S3C2410_RTCCON_RTCEN;
413 writew(con, info->base + S3C2410_RTCCON);
414
415 con = readb(info->base + S3C2410_TICNT);
416 con &= ~S3C2410_TICNT_ENABLE;
417 writeb(con, info->base + S3C2410_TICNT);
418}
419
420static void s3c6410_rtc_disable(struct s3c_rtc *info)
421{
422 unsigned int con;
423
424 con = readw(info->base + S3C2410_RTCCON);
425 con &= ~S3C64XX_RTCCON_TICEN;
426 con &= ~S3C2410_RTCCON_RTCEN;
427 writew(con, info->base + S3C2410_RTCCON);
428}
429
430static int s3c_rtc_remove(struct platform_device *pdev)
431{
432 struct s3c_rtc *info = platform_get_drvdata(pdev);
433
434 s3c_rtc_setaie(info->dev, 0);
435
436 if (info->data->needs_src_clk)
437 clk_unprepare(info->rtc_src_clk);
438 clk_unprepare(info->rtc_clk);
439
440 return 0;
441}
442
443static int s3c_rtc_probe(struct platform_device *pdev)
444{
445 struct s3c_rtc *info = NULL;
446 struct rtc_time rtc_tm;
447 int ret;
448
449 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
450 if (!info)
451 return -ENOMEM;
452
453 /* find the IRQs */
454 info->irq_tick = platform_get_irq(pdev, 1);
455 if (info->irq_tick < 0)
456 return info->irq_tick;
457
458 info->dev = &pdev->dev;
459 info->data = of_device_get_match_data(&pdev->dev);
460 if (!info->data) {
461 dev_err(&pdev->dev, "failed getting s3c_rtc_data\n");
462 return -EINVAL;
463 }
464 spin_lock_init(&info->pie_lock);
465 spin_lock_init(&info->alarm_lock);
466
467 platform_set_drvdata(pdev, info);
468
469 info->irq_alarm = platform_get_irq(pdev, 0);
470 if (info->irq_alarm < 0)
471 return info->irq_alarm;
472
473 dev_dbg(&pdev->dev, "s3c2410_rtc: tick irq %d, alarm irq %d\n",
474 info->irq_tick, info->irq_alarm);
475
476 /* get the memory region */
477 info->base = devm_platform_ioremap_resource(pdev, 0);
478 if (IS_ERR(info->base))
479 return PTR_ERR(info->base);
480
481 info->rtc_clk = devm_clk_get(&pdev->dev, "rtc");
482 if (IS_ERR(info->rtc_clk)) {
483 ret = PTR_ERR(info->rtc_clk);
484 if (ret != -EPROBE_DEFER)
485 dev_err(&pdev->dev, "failed to find rtc clock\n");
486 else
487 dev_dbg(&pdev->dev, "probe deferred due to missing rtc clk\n");
488 return ret;
489 }
490 ret = clk_prepare_enable(info->rtc_clk);
491 if (ret)
492 return ret;
493
494 if (info->data->needs_src_clk) {
495 info->rtc_src_clk = devm_clk_get(&pdev->dev, "rtc_src");
496 if (IS_ERR(info->rtc_src_clk)) {
497 ret = PTR_ERR(info->rtc_src_clk);
498 if (ret != -EPROBE_DEFER)
499 dev_err(&pdev->dev,
500 "failed to find rtc source clock\n");
501 else
502 dev_dbg(&pdev->dev,
503 "probe deferred due to missing rtc src clk\n");
504 goto err_src_clk;
505 }
506 ret = clk_prepare_enable(info->rtc_src_clk);
507 if (ret)
508 goto err_src_clk;
509 }
510
511 /* check to see if everything is setup correctly */
512 if (info->data->enable)
513 info->data->enable(info);
514
515 dev_dbg(&pdev->dev, "s3c2410_rtc: RTCCON=%02x\n",
516 readw(info->base + S3C2410_RTCCON));
517
518 device_init_wakeup(&pdev->dev, 1);
519
520 /* Check RTC Time */
521 if (s3c_rtc_gettime(&pdev->dev, &rtc_tm)) {
522 rtc_tm.tm_year = 100;
523 rtc_tm.tm_mon = 0;
524 rtc_tm.tm_mday = 1;
525 rtc_tm.tm_hour = 0;
526 rtc_tm.tm_min = 0;
527 rtc_tm.tm_sec = 0;
528
529 s3c_rtc_settime(&pdev->dev, &rtc_tm);
530
531 dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n");
532 }
533
534 /* register RTC and exit */
535 info->rtc = devm_rtc_device_register(&pdev->dev, "s3c", &s3c_rtcops,
536 THIS_MODULE);
537 if (IS_ERR(info->rtc)) {
538 dev_err(&pdev->dev, "cannot attach rtc\n");
539 ret = PTR_ERR(info->rtc);
540 goto err_nortc;
541 }
542
543 ret = devm_request_irq(&pdev->dev, info->irq_alarm, s3c_rtc_alarmirq,
544 0, "s3c2410-rtc alarm", info);
545 if (ret) {
546 dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_alarm, ret);
547 goto err_nortc;
548 }
549
550 ret = devm_request_irq(&pdev->dev, info->irq_tick, s3c_rtc_tickirq,
551 0, "s3c2410-rtc tick", info);
552 if (ret) {
553 dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_tick, ret);
554 goto err_nortc;
555 }
556
557 if (info->data->select_tick_clk)
558 info->data->select_tick_clk(info);
559
560 s3c_rtc_setfreq(info, 1);
561
562 s3c_rtc_disable_clk(info);
563
564 return 0;
565
566err_nortc:
567 if (info->data->disable)
568 info->data->disable(info);
569
570 if (info->data->needs_src_clk)
571 clk_disable_unprepare(info->rtc_src_clk);
572err_src_clk:
573 clk_disable_unprepare(info->rtc_clk);
574
575 return ret;
576}
577
578#ifdef CONFIG_PM_SLEEP
579
580static int s3c_rtc_suspend(struct device *dev)
581{
582 struct s3c_rtc *info = dev_get_drvdata(dev);
583 int ret;
584
585 ret = s3c_rtc_enable_clk(info);
586 if (ret)
587 return ret;
588
589 /* save TICNT for anyone using periodic interrupts */
590 if (info->data->save_tick_cnt)
591 info->data->save_tick_cnt(info);
592
593 if (info->data->disable)
594 info->data->disable(info);
595
596 if (device_may_wakeup(dev) && !info->wake_en) {
597 if (enable_irq_wake(info->irq_alarm) == 0)
598 info->wake_en = true;
599 else
600 dev_err(dev, "enable_irq_wake failed\n");
601 }
602
603 return 0;
604}
605
606static int s3c_rtc_resume(struct device *dev)
607{
608 struct s3c_rtc *info = dev_get_drvdata(dev);
609
610 if (info->data->enable)
611 info->data->enable(info);
612
613 if (info->data->restore_tick_cnt)
614 info->data->restore_tick_cnt(info);
615
616 s3c_rtc_disable_clk(info);
617
618 if (device_may_wakeup(dev) && info->wake_en) {
619 disable_irq_wake(info->irq_alarm);
620 info->wake_en = false;
621 }
622
623 return 0;
624}
625#endif
626static SIMPLE_DEV_PM_OPS(s3c_rtc_pm_ops, s3c_rtc_suspend, s3c_rtc_resume);
627
628static void s3c24xx_rtc_irq(struct s3c_rtc *info, int mask)
629{
630 rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF);
631}
632
633static void s3c6410_rtc_irq(struct s3c_rtc *info, int mask)
634{
635 rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF);
636 writeb(mask, info->base + S3C2410_INTP);
637}
638
639static void s3c2410_rtc_setfreq(struct s3c_rtc *info, int freq)
640{
641 unsigned int tmp = 0;
642 int val;
643
644 tmp = readb(info->base + S3C2410_TICNT);
645 tmp &= S3C2410_TICNT_ENABLE;
646
647 val = (info->rtc->max_user_freq / freq) - 1;
648 tmp |= val;
649
650 writel(tmp, info->base + S3C2410_TICNT);
651}
652
653static void s3c2416_rtc_setfreq(struct s3c_rtc *info, int freq)
654{
655 unsigned int tmp = 0;
656 int val;
657
658 tmp = readb(info->base + S3C2410_TICNT);
659 tmp &= S3C2410_TICNT_ENABLE;
660
661 val = (info->rtc->max_user_freq / freq) - 1;
662
663 tmp |= S3C2443_TICNT_PART(val);
664 writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1);
665
666 writel(S3C2416_TICNT2_PART(val), info->base + S3C2416_TICNT2);
667
668 writel(tmp, info->base + S3C2410_TICNT);
669}
670
671static void s3c2443_rtc_setfreq(struct s3c_rtc *info, int freq)
672{
673 unsigned int tmp = 0;
674 int val;
675
676 tmp = readb(info->base + S3C2410_TICNT);
677 tmp &= S3C2410_TICNT_ENABLE;
678
679 val = (info->rtc->max_user_freq / freq) - 1;
680
681 tmp |= S3C2443_TICNT_PART(val);
682 writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1);
683
684 writel(tmp, info->base + S3C2410_TICNT);
685}
686
687static void s3c6410_rtc_setfreq(struct s3c_rtc *info, int freq)
688{
689 int val;
690
691 val = (info->rtc->max_user_freq / freq) - 1;
692 writel(val, info->base + S3C2410_TICNT);
693}
694
695static void s3c24xx_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq)
696{
697 unsigned int ticnt;
698
699 ticnt = readb(info->base + S3C2410_TICNT);
700 ticnt &= S3C2410_TICNT_ENABLE;
701
702 seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no");
703}
704
705static void s3c2416_rtc_select_tick_clk(struct s3c_rtc *info)
706{
707 unsigned int con;
708
709 con = readw(info->base + S3C2410_RTCCON);
710 con |= S3C2443_RTCCON_TICSEL;
711 writew(con, info->base + S3C2410_RTCCON);
712}
713
714static void s3c6410_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq)
715{
716 unsigned int ticnt;
717
718 ticnt = readw(info->base + S3C2410_RTCCON);
719 ticnt &= S3C64XX_RTCCON_TICEN;
720
721 seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no");
722}
723
724static void s3c24xx_rtc_save_tick_cnt(struct s3c_rtc *info)
725{
726 info->ticnt_save = readb(info->base + S3C2410_TICNT);
727}
728
729static void s3c24xx_rtc_restore_tick_cnt(struct s3c_rtc *info)
730{
731 writeb(info->ticnt_save, info->base + S3C2410_TICNT);
732}
733
734static void s3c6410_rtc_save_tick_cnt(struct s3c_rtc *info)
735{
736 info->ticnt_en_save = readw(info->base + S3C2410_RTCCON);
737 info->ticnt_en_save &= S3C64XX_RTCCON_TICEN;
738 info->ticnt_save = readl(info->base + S3C2410_TICNT);
739}
740
741static void s3c6410_rtc_restore_tick_cnt(struct s3c_rtc *info)
742{
743 unsigned int con;
744
745 writel(info->ticnt_save, info->base + S3C2410_TICNT);
746 if (info->ticnt_en_save) {
747 con = readw(info->base + S3C2410_RTCCON);
748 writew(con | info->ticnt_en_save, info->base + S3C2410_RTCCON);
749 }
750}
751
752static struct s3c_rtc_data const s3c2410_rtc_data = {
753 .max_user_freq = 128,
754 .irq_handler = s3c24xx_rtc_irq,
755 .set_freq = s3c2410_rtc_setfreq,
756 .enable_tick = s3c24xx_rtc_enable_tick,
757 .save_tick_cnt = s3c24xx_rtc_save_tick_cnt,
758 .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt,
759 .enable = s3c24xx_rtc_enable,
760 .disable = s3c24xx_rtc_disable,
761};
762
763static struct s3c_rtc_data const s3c2416_rtc_data = {
764 .max_user_freq = 32768,
765 .irq_handler = s3c24xx_rtc_irq,
766 .set_freq = s3c2416_rtc_setfreq,
767 .enable_tick = s3c24xx_rtc_enable_tick,
768 .select_tick_clk = s3c2416_rtc_select_tick_clk,
769 .save_tick_cnt = s3c24xx_rtc_save_tick_cnt,
770 .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt,
771 .enable = s3c24xx_rtc_enable,
772 .disable = s3c24xx_rtc_disable,
773};
774
775static struct s3c_rtc_data const s3c2443_rtc_data = {
776 .max_user_freq = 32768,
777 .irq_handler = s3c24xx_rtc_irq,
778 .set_freq = s3c2443_rtc_setfreq,
779 .enable_tick = s3c24xx_rtc_enable_tick,
780 .select_tick_clk = s3c2416_rtc_select_tick_clk,
781 .save_tick_cnt = s3c24xx_rtc_save_tick_cnt,
782 .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt,
783 .enable = s3c24xx_rtc_enable,
784 .disable = s3c24xx_rtc_disable,
785};
786
787static struct s3c_rtc_data const s3c6410_rtc_data = {
788 .max_user_freq = 32768,
789 .needs_src_clk = true,
790 .irq_handler = s3c6410_rtc_irq,
791 .set_freq = s3c6410_rtc_setfreq,
792 .enable_tick = s3c6410_rtc_enable_tick,
793 .save_tick_cnt = s3c6410_rtc_save_tick_cnt,
794 .restore_tick_cnt = s3c6410_rtc_restore_tick_cnt,
795 .enable = s3c24xx_rtc_enable,
796 .disable = s3c6410_rtc_disable,
797};
798
799static const struct of_device_id s3c_rtc_dt_match[] = {
800 {
801 .compatible = "samsung,s3c2410-rtc",
802 .data = &s3c2410_rtc_data,
803 }, {
804 .compatible = "samsung,s3c2416-rtc",
805 .data = &s3c2416_rtc_data,
806 }, {
807 .compatible = "samsung,s3c2443-rtc",
808 .data = &s3c2443_rtc_data,
809 }, {
810 .compatible = "samsung,s3c6410-rtc",
811 .data = &s3c6410_rtc_data,
812 }, {
813 .compatible = "samsung,exynos3250-rtc",
814 .data = &s3c6410_rtc_data,
815 },
816 { /* sentinel */ },
817};
818MODULE_DEVICE_TABLE(of, s3c_rtc_dt_match);
819
820static struct platform_driver s3c_rtc_driver = {
821 .probe = s3c_rtc_probe,
822 .remove = s3c_rtc_remove,
823 .driver = {
824 .name = "s3c-rtc",
825 .pm = &s3c_rtc_pm_ops,
826 .of_match_table = of_match_ptr(s3c_rtc_dt_match),
827 },
828};
829module_platform_driver(s3c_rtc_driver);
830
831MODULE_DESCRIPTION("Samsung S3C RTC Driver");
832MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
833MODULE_LICENSE("GPL");
834MODULE_ALIAS("platform:s3c2410-rtc");
1// SPDX-License-Identifier: GPL-2.0-only
2/* drivers/rtc/rtc-s3c.c
3 *
4 * Copyright (c) 2010 Samsung Electronics Co., Ltd.
5 * http://www.samsung.com/
6 *
7 * Copyright (c) 2004,2006 Simtec Electronics
8 * Ben Dooks, <ben@simtec.co.uk>
9 * http://armlinux.simtec.co.uk/
10 *
11 * S3C2410/S3C2440/S3C24XX Internal RTC Driver
12*/
13
14#include <linux/module.h>
15#include <linux/fs.h>
16#include <linux/string.h>
17#include <linux/init.h>
18#include <linux/platform_device.h>
19#include <linux/interrupt.h>
20#include <linux/rtc.h>
21#include <linux/bcd.h>
22#include <linux/clk.h>
23#include <linux/log2.h>
24#include <linux/slab.h>
25#include <linux/of.h>
26#include <linux/of_device.h>
27#include <linux/uaccess.h>
28#include <linux/io.h>
29
30#include <asm/irq.h>
31#include "rtc-s3c.h"
32
33struct s3c_rtc {
34 struct device *dev;
35 struct rtc_device *rtc;
36
37 void __iomem *base;
38 struct clk *rtc_clk;
39 struct clk *rtc_src_clk;
40 bool alarm_enabled;
41
42 const struct s3c_rtc_data *data;
43
44 int irq_alarm;
45 int irq_tick;
46
47 spinlock_t pie_lock;
48 spinlock_t alarm_lock;
49
50 int ticnt_save;
51 int ticnt_en_save;
52 bool wake_en;
53};
54
55struct s3c_rtc_data {
56 int max_user_freq;
57 bool needs_src_clk;
58
59 void (*irq_handler) (struct s3c_rtc *info, int mask);
60 void (*set_freq) (struct s3c_rtc *info, int freq);
61 void (*enable_tick) (struct s3c_rtc *info, struct seq_file *seq);
62 void (*select_tick_clk) (struct s3c_rtc *info);
63 void (*save_tick_cnt) (struct s3c_rtc *info);
64 void (*restore_tick_cnt) (struct s3c_rtc *info);
65 void (*enable) (struct s3c_rtc *info);
66 void (*disable) (struct s3c_rtc *info);
67};
68
69static int s3c_rtc_enable_clk(struct s3c_rtc *info)
70{
71 int ret;
72
73 ret = clk_enable(info->rtc_clk);
74 if (ret)
75 return ret;
76
77 if (info->data->needs_src_clk) {
78 ret = clk_enable(info->rtc_src_clk);
79 if (ret) {
80 clk_disable(info->rtc_clk);
81 return ret;
82 }
83 }
84 return 0;
85}
86
87static void s3c_rtc_disable_clk(struct s3c_rtc *info)
88{
89 if (info->data->needs_src_clk)
90 clk_disable(info->rtc_src_clk);
91 clk_disable(info->rtc_clk);
92}
93
94/* IRQ Handlers */
95static irqreturn_t s3c_rtc_tickirq(int irq, void *id)
96{
97 struct s3c_rtc *info = (struct s3c_rtc *)id;
98
99 if (info->data->irq_handler)
100 info->data->irq_handler(info, S3C2410_INTP_TIC);
101
102 return IRQ_HANDLED;
103}
104
105static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)
106{
107 struct s3c_rtc *info = (struct s3c_rtc *)id;
108
109 if (info->data->irq_handler)
110 info->data->irq_handler(info, S3C2410_INTP_ALM);
111
112 return IRQ_HANDLED;
113}
114
115/* Update control registers */
116static int s3c_rtc_setaie(struct device *dev, unsigned int enabled)
117{
118 struct s3c_rtc *info = dev_get_drvdata(dev);
119 unsigned long flags;
120 unsigned int tmp;
121 int ret;
122
123 dev_dbg(info->dev, "%s: aie=%d\n", __func__, enabled);
124
125 ret = s3c_rtc_enable_clk(info);
126 if (ret)
127 return ret;
128
129 tmp = readb(info->base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
130
131 if (enabled)
132 tmp |= S3C2410_RTCALM_ALMEN;
133
134 writeb(tmp, info->base + S3C2410_RTCALM);
135
136 spin_lock_irqsave(&info->alarm_lock, flags);
137
138 if (info->alarm_enabled && !enabled)
139 s3c_rtc_disable_clk(info);
140 else if (!info->alarm_enabled && enabled)
141 ret = s3c_rtc_enable_clk(info);
142
143 info->alarm_enabled = enabled;
144 spin_unlock_irqrestore(&info->alarm_lock, flags);
145
146 s3c_rtc_disable_clk(info);
147
148 return ret;
149}
150
151/* Set RTC frequency */
152static int s3c_rtc_setfreq(struct s3c_rtc *info, int freq)
153{
154 int ret;
155
156 if (!is_power_of_2(freq))
157 return -EINVAL;
158
159 ret = s3c_rtc_enable_clk(info);
160 if (ret)
161 return ret;
162 spin_lock_irq(&info->pie_lock);
163
164 if (info->data->set_freq)
165 info->data->set_freq(info, freq);
166
167 spin_unlock_irq(&info->pie_lock);
168 s3c_rtc_disable_clk(info);
169
170 return 0;
171}
172
173/* Time read/write */
174static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
175{
176 struct s3c_rtc *info = dev_get_drvdata(dev);
177 unsigned int have_retried = 0;
178 int ret;
179
180 ret = s3c_rtc_enable_clk(info);
181 if (ret)
182 return ret;
183
184retry_get_time:
185 rtc_tm->tm_min = readb(info->base + S3C2410_RTCMIN);
186 rtc_tm->tm_hour = readb(info->base + S3C2410_RTCHOUR);
187 rtc_tm->tm_mday = readb(info->base + S3C2410_RTCDATE);
188 rtc_tm->tm_mon = readb(info->base + S3C2410_RTCMON);
189 rtc_tm->tm_year = readb(info->base + S3C2410_RTCYEAR);
190 rtc_tm->tm_sec = readb(info->base + S3C2410_RTCSEC);
191
192 /* the only way to work out whether the system was mid-update
193 * when we read it is to check the second counter, and if it
194 * is zero, then we re-try the entire read
195 */
196
197 if (rtc_tm->tm_sec == 0 && !have_retried) {
198 have_retried = 1;
199 goto retry_get_time;
200 }
201
202 rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
203 rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
204 rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
205 rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
206 rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
207 rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);
208
209 s3c_rtc_disable_clk(info);
210
211 rtc_tm->tm_year += 100;
212 rtc_tm->tm_mon -= 1;
213
214 dev_dbg(dev, "read time %ptR\n", rtc_tm);
215 return 0;
216}
217
218static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
219{
220 struct s3c_rtc *info = dev_get_drvdata(dev);
221 int year = tm->tm_year - 100;
222 int ret;
223
224 dev_dbg(dev, "set time %ptR\n", tm);
225
226 /* we get around y2k by simply not supporting it */
227
228 if (year < 0 || year >= 100) {
229 dev_err(dev, "rtc only supports 100 years\n");
230 return -EINVAL;
231 }
232
233 ret = s3c_rtc_enable_clk(info);
234 if (ret)
235 return ret;
236
237 writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_RTCSEC);
238 writeb(bin2bcd(tm->tm_min), info->base + S3C2410_RTCMIN);
239 writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_RTCHOUR);
240 writeb(bin2bcd(tm->tm_mday), info->base + S3C2410_RTCDATE);
241 writeb(bin2bcd(tm->tm_mon + 1), info->base + S3C2410_RTCMON);
242 writeb(bin2bcd(year), info->base + S3C2410_RTCYEAR);
243
244 s3c_rtc_disable_clk(info);
245
246 return 0;
247}
248
249static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
250{
251 struct s3c_rtc *info = dev_get_drvdata(dev);
252 struct rtc_time *alm_tm = &alrm->time;
253 unsigned int alm_en;
254 int ret;
255
256 ret = s3c_rtc_enable_clk(info);
257 if (ret)
258 return ret;
259
260 alm_tm->tm_sec = readb(info->base + S3C2410_ALMSEC);
261 alm_tm->tm_min = readb(info->base + S3C2410_ALMMIN);
262 alm_tm->tm_hour = readb(info->base + S3C2410_ALMHOUR);
263 alm_tm->tm_mon = readb(info->base + S3C2410_ALMMON);
264 alm_tm->tm_mday = readb(info->base + S3C2410_ALMDATE);
265 alm_tm->tm_year = readb(info->base + S3C2410_ALMYEAR);
266
267 alm_en = readb(info->base + S3C2410_RTCALM);
268
269 s3c_rtc_disable_clk(info);
270
271 alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0;
272
273 dev_dbg(dev, "read alarm %d, %ptR\n", alm_en, alm_tm);
274
275 /* decode the alarm enable field */
276 if (alm_en & S3C2410_RTCALM_SECEN)
277 alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec);
278
279 if (alm_en & S3C2410_RTCALM_MINEN)
280 alm_tm->tm_min = bcd2bin(alm_tm->tm_min);
281
282 if (alm_en & S3C2410_RTCALM_HOUREN)
283 alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour);
284
285 if (alm_en & S3C2410_RTCALM_DAYEN)
286 alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday);
287
288 if (alm_en & S3C2410_RTCALM_MONEN) {
289 alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon);
290 alm_tm->tm_mon -= 1;
291 }
292
293 if (alm_en & S3C2410_RTCALM_YEAREN)
294 alm_tm->tm_year = bcd2bin(alm_tm->tm_year);
295
296 return 0;
297}
298
299static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
300{
301 struct s3c_rtc *info = dev_get_drvdata(dev);
302 struct rtc_time *tm = &alrm->time;
303 unsigned int alrm_en;
304 int ret;
305
306 dev_dbg(dev, "s3c_rtc_setalarm: %d, %ptR\n", alrm->enabled, tm);
307
308 ret = s3c_rtc_enable_clk(info);
309 if (ret)
310 return ret;
311
312 alrm_en = readb(info->base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
313 writeb(0x00, info->base + S3C2410_RTCALM);
314
315 if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
316 alrm_en |= S3C2410_RTCALM_SECEN;
317 writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_ALMSEC);
318 }
319
320 if (tm->tm_min < 60 && tm->tm_min >= 0) {
321 alrm_en |= S3C2410_RTCALM_MINEN;
322 writeb(bin2bcd(tm->tm_min), info->base + S3C2410_ALMMIN);
323 }
324
325 if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
326 alrm_en |= S3C2410_RTCALM_HOUREN;
327 writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_ALMHOUR);
328 }
329
330 if (tm->tm_mon < 12 && tm->tm_mon >= 0) {
331 alrm_en |= S3C2410_RTCALM_MONEN;
332 writeb(bin2bcd(tm->tm_mon + 1), info->base + S3C2410_ALMMON);
333 }
334
335 if (tm->tm_mday <= 31 && tm->tm_mday >= 1) {
336 alrm_en |= S3C2410_RTCALM_DAYEN;
337 writeb(bin2bcd(tm->tm_mday), info->base + S3C2410_ALMDATE);
338 }
339
340 dev_dbg(dev, "setting S3C2410_RTCALM to %08x\n", alrm_en);
341
342 writeb(alrm_en, info->base + S3C2410_RTCALM);
343
344 s3c_rtc_setaie(dev, alrm->enabled);
345
346 s3c_rtc_disable_clk(info);
347
348 return 0;
349}
350
351static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
352{
353 struct s3c_rtc *info = dev_get_drvdata(dev);
354 int ret;
355
356 ret = s3c_rtc_enable_clk(info);
357 if (ret)
358 return ret;
359
360 if (info->data->enable_tick)
361 info->data->enable_tick(info, seq);
362
363 s3c_rtc_disable_clk(info);
364
365 return 0;
366}
367
368static const struct rtc_class_ops s3c_rtcops = {
369 .read_time = s3c_rtc_gettime,
370 .set_time = s3c_rtc_settime,
371 .read_alarm = s3c_rtc_getalarm,
372 .set_alarm = s3c_rtc_setalarm,
373 .proc = s3c_rtc_proc,
374 .alarm_irq_enable = s3c_rtc_setaie,
375};
376
377static void s3c24xx_rtc_enable(struct s3c_rtc *info)
378{
379 unsigned int con, tmp;
380
381 con = readw(info->base + S3C2410_RTCCON);
382 /* re-enable the device, and check it is ok */
383 if ((con & S3C2410_RTCCON_RTCEN) == 0) {
384 dev_info(info->dev, "rtc disabled, re-enabling\n");
385
386 tmp = readw(info->base + S3C2410_RTCCON);
387 writew(tmp | S3C2410_RTCCON_RTCEN, info->base + S3C2410_RTCCON);
388 }
389
390 if (con & S3C2410_RTCCON_CNTSEL) {
391 dev_info(info->dev, "removing RTCCON_CNTSEL\n");
392
393 tmp = readw(info->base + S3C2410_RTCCON);
394 writew(tmp & ~S3C2410_RTCCON_CNTSEL,
395 info->base + S3C2410_RTCCON);
396 }
397
398 if (con & S3C2410_RTCCON_CLKRST) {
399 dev_info(info->dev, "removing RTCCON_CLKRST\n");
400
401 tmp = readw(info->base + S3C2410_RTCCON);
402 writew(tmp & ~S3C2410_RTCCON_CLKRST,
403 info->base + S3C2410_RTCCON);
404 }
405}
406
407static void s3c24xx_rtc_disable(struct s3c_rtc *info)
408{
409 unsigned int con;
410
411 con = readw(info->base + S3C2410_RTCCON);
412 con &= ~S3C2410_RTCCON_RTCEN;
413 writew(con, info->base + S3C2410_RTCCON);
414
415 con = readb(info->base + S3C2410_TICNT);
416 con &= ~S3C2410_TICNT_ENABLE;
417 writeb(con, info->base + S3C2410_TICNT);
418}
419
420static void s3c6410_rtc_disable(struct s3c_rtc *info)
421{
422 unsigned int con;
423
424 con = readw(info->base + S3C2410_RTCCON);
425 con &= ~S3C64XX_RTCCON_TICEN;
426 con &= ~S3C2410_RTCCON_RTCEN;
427 writew(con, info->base + S3C2410_RTCCON);
428}
429
430static int s3c_rtc_remove(struct platform_device *pdev)
431{
432 struct s3c_rtc *info = platform_get_drvdata(pdev);
433
434 s3c_rtc_setaie(info->dev, 0);
435
436 if (info->data->needs_src_clk)
437 clk_unprepare(info->rtc_src_clk);
438 clk_unprepare(info->rtc_clk);
439
440 return 0;
441}
442
443static int s3c_rtc_probe(struct platform_device *pdev)
444{
445 struct s3c_rtc *info = NULL;
446 struct rtc_time rtc_tm;
447 struct resource *res;
448 int ret;
449
450 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
451 if (!info)
452 return -ENOMEM;
453
454 /* find the IRQs */
455 info->irq_tick = platform_get_irq(pdev, 1);
456 if (info->irq_tick < 0)
457 return info->irq_tick;
458
459 info->dev = &pdev->dev;
460 info->data = of_device_get_match_data(&pdev->dev);
461 if (!info->data) {
462 dev_err(&pdev->dev, "failed getting s3c_rtc_data\n");
463 return -EINVAL;
464 }
465 spin_lock_init(&info->pie_lock);
466 spin_lock_init(&info->alarm_lock);
467
468 platform_set_drvdata(pdev, info);
469
470 info->irq_alarm = platform_get_irq(pdev, 0);
471 if (info->irq_alarm < 0)
472 return info->irq_alarm;
473
474 dev_dbg(&pdev->dev, "s3c2410_rtc: tick irq %d, alarm irq %d\n",
475 info->irq_tick, info->irq_alarm);
476
477 /* get the memory region */
478 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
479 info->base = devm_ioremap_resource(&pdev->dev, res);
480 if (IS_ERR(info->base))
481 return PTR_ERR(info->base);
482
483 info->rtc_clk = devm_clk_get(&pdev->dev, "rtc");
484 if (IS_ERR(info->rtc_clk)) {
485 ret = PTR_ERR(info->rtc_clk);
486 if (ret != -EPROBE_DEFER)
487 dev_err(&pdev->dev, "failed to find rtc clock\n");
488 else
489 dev_dbg(&pdev->dev, "probe deferred due to missing rtc clk\n");
490 return ret;
491 }
492 ret = clk_prepare_enable(info->rtc_clk);
493 if (ret)
494 return ret;
495
496 if (info->data->needs_src_clk) {
497 info->rtc_src_clk = devm_clk_get(&pdev->dev, "rtc_src");
498 if (IS_ERR(info->rtc_src_clk)) {
499 ret = PTR_ERR(info->rtc_src_clk);
500 if (ret != -EPROBE_DEFER)
501 dev_err(&pdev->dev,
502 "failed to find rtc source clock\n");
503 else
504 dev_dbg(&pdev->dev,
505 "probe deferred due to missing rtc src clk\n");
506 goto err_src_clk;
507 }
508 ret = clk_prepare_enable(info->rtc_src_clk);
509 if (ret)
510 goto err_src_clk;
511 }
512
513 /* check to see if everything is setup correctly */
514 if (info->data->enable)
515 info->data->enable(info);
516
517 dev_dbg(&pdev->dev, "s3c2410_rtc: RTCCON=%02x\n",
518 readw(info->base + S3C2410_RTCCON));
519
520 device_init_wakeup(&pdev->dev, 1);
521
522 /* Check RTC Time */
523 if (s3c_rtc_gettime(&pdev->dev, &rtc_tm)) {
524 rtc_tm.tm_year = 100;
525 rtc_tm.tm_mon = 0;
526 rtc_tm.tm_mday = 1;
527 rtc_tm.tm_hour = 0;
528 rtc_tm.tm_min = 0;
529 rtc_tm.tm_sec = 0;
530
531 s3c_rtc_settime(&pdev->dev, &rtc_tm);
532
533 dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n");
534 }
535
536 /* register RTC and exit */
537 info->rtc = devm_rtc_device_register(&pdev->dev, "s3c", &s3c_rtcops,
538 THIS_MODULE);
539 if (IS_ERR(info->rtc)) {
540 dev_err(&pdev->dev, "cannot attach rtc\n");
541 ret = PTR_ERR(info->rtc);
542 goto err_nortc;
543 }
544
545 ret = devm_request_irq(&pdev->dev, info->irq_alarm, s3c_rtc_alarmirq,
546 0, "s3c2410-rtc alarm", info);
547 if (ret) {
548 dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_alarm, ret);
549 goto err_nortc;
550 }
551
552 ret = devm_request_irq(&pdev->dev, info->irq_tick, s3c_rtc_tickirq,
553 0, "s3c2410-rtc tick", info);
554 if (ret) {
555 dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_tick, ret);
556 goto err_nortc;
557 }
558
559 if (info->data->select_tick_clk)
560 info->data->select_tick_clk(info);
561
562 s3c_rtc_setfreq(info, 1);
563
564 s3c_rtc_disable_clk(info);
565
566 return 0;
567
568err_nortc:
569 if (info->data->disable)
570 info->data->disable(info);
571
572 if (info->data->needs_src_clk)
573 clk_disable_unprepare(info->rtc_src_clk);
574err_src_clk:
575 clk_disable_unprepare(info->rtc_clk);
576
577 return ret;
578}
579
580#ifdef CONFIG_PM_SLEEP
581
582static int s3c_rtc_suspend(struct device *dev)
583{
584 struct s3c_rtc *info = dev_get_drvdata(dev);
585 int ret;
586
587 ret = s3c_rtc_enable_clk(info);
588 if (ret)
589 return ret;
590
591 /* save TICNT for anyone using periodic interrupts */
592 if (info->data->save_tick_cnt)
593 info->data->save_tick_cnt(info);
594
595 if (info->data->disable)
596 info->data->disable(info);
597
598 if (device_may_wakeup(dev) && !info->wake_en) {
599 if (enable_irq_wake(info->irq_alarm) == 0)
600 info->wake_en = true;
601 else
602 dev_err(dev, "enable_irq_wake failed\n");
603 }
604
605 return 0;
606}
607
608static int s3c_rtc_resume(struct device *dev)
609{
610 struct s3c_rtc *info = dev_get_drvdata(dev);
611
612 if (info->data->enable)
613 info->data->enable(info);
614
615 if (info->data->restore_tick_cnt)
616 info->data->restore_tick_cnt(info);
617
618 s3c_rtc_disable_clk(info);
619
620 if (device_may_wakeup(dev) && info->wake_en) {
621 disable_irq_wake(info->irq_alarm);
622 info->wake_en = false;
623 }
624
625 return 0;
626}
627#endif
628static SIMPLE_DEV_PM_OPS(s3c_rtc_pm_ops, s3c_rtc_suspend, s3c_rtc_resume);
629
630static void s3c24xx_rtc_irq(struct s3c_rtc *info, int mask)
631{
632 rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF);
633}
634
635static void s3c6410_rtc_irq(struct s3c_rtc *info, int mask)
636{
637 rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF);
638 writeb(mask, info->base + S3C2410_INTP);
639}
640
641static void s3c2410_rtc_setfreq(struct s3c_rtc *info, int freq)
642{
643 unsigned int tmp = 0;
644 int val;
645
646 tmp = readb(info->base + S3C2410_TICNT);
647 tmp &= S3C2410_TICNT_ENABLE;
648
649 val = (info->rtc->max_user_freq / freq) - 1;
650 tmp |= val;
651
652 writel(tmp, info->base + S3C2410_TICNT);
653}
654
655static void s3c2416_rtc_setfreq(struct s3c_rtc *info, int freq)
656{
657 unsigned int tmp = 0;
658 int val;
659
660 tmp = readb(info->base + S3C2410_TICNT);
661 tmp &= S3C2410_TICNT_ENABLE;
662
663 val = (info->rtc->max_user_freq / freq) - 1;
664
665 tmp |= S3C2443_TICNT_PART(val);
666 writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1);
667
668 writel(S3C2416_TICNT2_PART(val), info->base + S3C2416_TICNT2);
669
670 writel(tmp, info->base + S3C2410_TICNT);
671}
672
673static void s3c2443_rtc_setfreq(struct s3c_rtc *info, int freq)
674{
675 unsigned int tmp = 0;
676 int val;
677
678 tmp = readb(info->base + S3C2410_TICNT);
679 tmp &= S3C2410_TICNT_ENABLE;
680
681 val = (info->rtc->max_user_freq / freq) - 1;
682
683 tmp |= S3C2443_TICNT_PART(val);
684 writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1);
685
686 writel(tmp, info->base + S3C2410_TICNT);
687}
688
689static void s3c6410_rtc_setfreq(struct s3c_rtc *info, int freq)
690{
691 int val;
692
693 val = (info->rtc->max_user_freq / freq) - 1;
694 writel(val, info->base + S3C2410_TICNT);
695}
696
697static void s3c24xx_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq)
698{
699 unsigned int ticnt;
700
701 ticnt = readb(info->base + S3C2410_TICNT);
702 ticnt &= S3C2410_TICNT_ENABLE;
703
704 seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no");
705}
706
707static void s3c2416_rtc_select_tick_clk(struct s3c_rtc *info)
708{
709 unsigned int con;
710
711 con = readw(info->base + S3C2410_RTCCON);
712 con |= S3C2443_RTCCON_TICSEL;
713 writew(con, info->base + S3C2410_RTCCON);
714}
715
716static void s3c6410_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq)
717{
718 unsigned int ticnt;
719
720 ticnt = readw(info->base + S3C2410_RTCCON);
721 ticnt &= S3C64XX_RTCCON_TICEN;
722
723 seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no");
724}
725
726static void s3c24xx_rtc_save_tick_cnt(struct s3c_rtc *info)
727{
728 info->ticnt_save = readb(info->base + S3C2410_TICNT);
729}
730
731static void s3c24xx_rtc_restore_tick_cnt(struct s3c_rtc *info)
732{
733 writeb(info->ticnt_save, info->base + S3C2410_TICNT);
734}
735
736static void s3c6410_rtc_save_tick_cnt(struct s3c_rtc *info)
737{
738 info->ticnt_en_save = readw(info->base + S3C2410_RTCCON);
739 info->ticnt_en_save &= S3C64XX_RTCCON_TICEN;
740 info->ticnt_save = readl(info->base + S3C2410_TICNT);
741}
742
743static void s3c6410_rtc_restore_tick_cnt(struct s3c_rtc *info)
744{
745 unsigned int con;
746
747 writel(info->ticnt_save, info->base + S3C2410_TICNT);
748 if (info->ticnt_en_save) {
749 con = readw(info->base + S3C2410_RTCCON);
750 writew(con | info->ticnt_en_save, info->base + S3C2410_RTCCON);
751 }
752}
753
754static struct s3c_rtc_data const s3c2410_rtc_data = {
755 .max_user_freq = 128,
756 .irq_handler = s3c24xx_rtc_irq,
757 .set_freq = s3c2410_rtc_setfreq,
758 .enable_tick = s3c24xx_rtc_enable_tick,
759 .save_tick_cnt = s3c24xx_rtc_save_tick_cnt,
760 .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt,
761 .enable = s3c24xx_rtc_enable,
762 .disable = s3c24xx_rtc_disable,
763};
764
765static struct s3c_rtc_data const s3c2416_rtc_data = {
766 .max_user_freq = 32768,
767 .irq_handler = s3c24xx_rtc_irq,
768 .set_freq = s3c2416_rtc_setfreq,
769 .enable_tick = s3c24xx_rtc_enable_tick,
770 .select_tick_clk = s3c2416_rtc_select_tick_clk,
771 .save_tick_cnt = s3c24xx_rtc_save_tick_cnt,
772 .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt,
773 .enable = s3c24xx_rtc_enable,
774 .disable = s3c24xx_rtc_disable,
775};
776
777static struct s3c_rtc_data const s3c2443_rtc_data = {
778 .max_user_freq = 32768,
779 .irq_handler = s3c24xx_rtc_irq,
780 .set_freq = s3c2443_rtc_setfreq,
781 .enable_tick = s3c24xx_rtc_enable_tick,
782 .select_tick_clk = s3c2416_rtc_select_tick_clk,
783 .save_tick_cnt = s3c24xx_rtc_save_tick_cnt,
784 .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt,
785 .enable = s3c24xx_rtc_enable,
786 .disable = s3c24xx_rtc_disable,
787};
788
789static struct s3c_rtc_data const s3c6410_rtc_data = {
790 .max_user_freq = 32768,
791 .needs_src_clk = true,
792 .irq_handler = s3c6410_rtc_irq,
793 .set_freq = s3c6410_rtc_setfreq,
794 .enable_tick = s3c6410_rtc_enable_tick,
795 .save_tick_cnt = s3c6410_rtc_save_tick_cnt,
796 .restore_tick_cnt = s3c6410_rtc_restore_tick_cnt,
797 .enable = s3c24xx_rtc_enable,
798 .disable = s3c6410_rtc_disable,
799};
800
801static const struct of_device_id s3c_rtc_dt_match[] = {
802 {
803 .compatible = "samsung,s3c2410-rtc",
804 .data = &s3c2410_rtc_data,
805 }, {
806 .compatible = "samsung,s3c2416-rtc",
807 .data = &s3c2416_rtc_data,
808 }, {
809 .compatible = "samsung,s3c2443-rtc",
810 .data = &s3c2443_rtc_data,
811 }, {
812 .compatible = "samsung,s3c6410-rtc",
813 .data = &s3c6410_rtc_data,
814 }, {
815 .compatible = "samsung,exynos3250-rtc",
816 .data = &s3c6410_rtc_data,
817 },
818 { /* sentinel */ },
819};
820MODULE_DEVICE_TABLE(of, s3c_rtc_dt_match);
821
822static struct platform_driver s3c_rtc_driver = {
823 .probe = s3c_rtc_probe,
824 .remove = s3c_rtc_remove,
825 .driver = {
826 .name = "s3c-rtc",
827 .pm = &s3c_rtc_pm_ops,
828 .of_match_table = of_match_ptr(s3c_rtc_dt_match),
829 },
830};
831module_platform_driver(s3c_rtc_driver);
832
833MODULE_DESCRIPTION("Samsung S3C RTC Driver");
834MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
835MODULE_LICENSE("GPL");
836MODULE_ALIAS("platform:s3c2410-rtc");