Loading...
1/* drivers/rtc/rtc-s3c.c
2 *
3 * Copyright (c) 2010 Samsung Electronics Co., Ltd.
4 * http://www.samsung.com/
5 *
6 * Copyright (c) 2004,2006 Simtec Electronics
7 * Ben Dooks, <ben@simtec.co.uk>
8 * http://armlinux.simtec.co.uk/
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 *
14 * S3C2410/S3C2440/S3C24XX Internal RTC Driver
15*/
16
17#include <linux/module.h>
18#include <linux/fs.h>
19#include <linux/string.h>
20#include <linux/init.h>
21#include <linux/platform_device.h>
22#include <linux/interrupt.h>
23#include <linux/rtc.h>
24#include <linux/bcd.h>
25#include <linux/clk.h>
26#include <linux/log2.h>
27#include <linux/slab.h>
28#include <linux/of.h>
29#include <linux/uaccess.h>
30#include <linux/io.h>
31
32#include <asm/irq.h>
33#include "rtc-s3c.h"
34
35struct s3c_rtc {
36 struct device *dev;
37 struct rtc_device *rtc;
38
39 void __iomem *base;
40 struct clk *rtc_clk;
41 struct clk *rtc_src_clk;
42 bool clk_disabled;
43
44 const struct s3c_rtc_data *data;
45
46 int irq_alarm;
47 int irq_tick;
48
49 spinlock_t pie_lock;
50 spinlock_t alarm_clk_lock;
51
52 int ticnt_save;
53 int ticnt_en_save;
54 bool wake_en;
55};
56
57struct s3c_rtc_data {
58 int max_user_freq;
59 bool needs_src_clk;
60
61 void (*irq_handler) (struct s3c_rtc *info, int mask);
62 void (*set_freq) (struct s3c_rtc *info, int freq);
63 void (*enable_tick) (struct s3c_rtc *info, struct seq_file *seq);
64 void (*select_tick_clk) (struct s3c_rtc *info);
65 void (*save_tick_cnt) (struct s3c_rtc *info);
66 void (*restore_tick_cnt) (struct s3c_rtc *info);
67 void (*enable) (struct s3c_rtc *info);
68 void (*disable) (struct s3c_rtc *info);
69};
70
71static int s3c_rtc_enable_clk(struct s3c_rtc *info)
72{
73 unsigned long irq_flags;
74 int ret = 0;
75
76 spin_lock_irqsave(&info->alarm_clk_lock, irq_flags);
77
78 if (info->clk_disabled) {
79 ret = clk_enable(info->rtc_clk);
80 if (ret)
81 goto out;
82
83 if (info->data->needs_src_clk) {
84 ret = clk_enable(info->rtc_src_clk);
85 if (ret) {
86 clk_disable(info->rtc_clk);
87 goto out;
88 }
89 }
90 info->clk_disabled = false;
91 }
92
93out:
94 spin_unlock_irqrestore(&info->alarm_clk_lock, irq_flags);
95
96 return ret;
97}
98
99static void s3c_rtc_disable_clk(struct s3c_rtc *info)
100{
101 unsigned long irq_flags;
102
103 spin_lock_irqsave(&info->alarm_clk_lock, irq_flags);
104 if (!info->clk_disabled) {
105 if (info->data->needs_src_clk)
106 clk_disable(info->rtc_src_clk);
107 clk_disable(info->rtc_clk);
108 info->clk_disabled = true;
109 }
110 spin_unlock_irqrestore(&info->alarm_clk_lock, irq_flags);
111}
112
113/* IRQ Handlers */
114static irqreturn_t s3c_rtc_tickirq(int irq, void *id)
115{
116 struct s3c_rtc *info = (struct s3c_rtc *)id;
117
118 if (info->data->irq_handler)
119 info->data->irq_handler(info, S3C2410_INTP_TIC);
120
121 return IRQ_HANDLED;
122}
123
124static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)
125{
126 struct s3c_rtc *info = (struct s3c_rtc *)id;
127
128 if (info->data->irq_handler)
129 info->data->irq_handler(info, S3C2410_INTP_ALM);
130
131 return IRQ_HANDLED;
132}
133
134/* Update control registers */
135static int s3c_rtc_setaie(struct device *dev, unsigned int enabled)
136{
137 struct s3c_rtc *info = dev_get_drvdata(dev);
138 unsigned int tmp;
139 int ret;
140
141 dev_dbg(info->dev, "%s: aie=%d\n", __func__, enabled);
142
143 ret = s3c_rtc_enable_clk(info);
144 if (ret)
145 return ret;
146
147 tmp = readb(info->base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
148
149 if (enabled)
150 tmp |= S3C2410_RTCALM_ALMEN;
151
152 writeb(tmp, info->base + S3C2410_RTCALM);
153
154 s3c_rtc_disable_clk(info);
155
156 if (enabled) {
157 ret = s3c_rtc_enable_clk(info);
158 if (ret)
159 return ret;
160 } else {
161 s3c_rtc_disable_clk(info);
162 }
163
164 return 0;
165}
166
167/* Set RTC frequency */
168static int s3c_rtc_setfreq(struct s3c_rtc *info, int freq)
169{
170 int ret;
171
172 if (!is_power_of_2(freq))
173 return -EINVAL;
174
175 ret = s3c_rtc_enable_clk(info);
176 if (ret)
177 return ret;
178 spin_lock_irq(&info->pie_lock);
179
180 if (info->data->set_freq)
181 info->data->set_freq(info, freq);
182
183 spin_unlock_irq(&info->pie_lock);
184 s3c_rtc_disable_clk(info);
185
186 return 0;
187}
188
189/* Time read/write */
190static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
191{
192 struct s3c_rtc *info = dev_get_drvdata(dev);
193 unsigned int have_retried = 0;
194 int ret;
195
196 ret = s3c_rtc_enable_clk(info);
197 if (ret)
198 return ret;
199
200retry_get_time:
201 rtc_tm->tm_min = readb(info->base + S3C2410_RTCMIN);
202 rtc_tm->tm_hour = readb(info->base + S3C2410_RTCHOUR);
203 rtc_tm->tm_mday = readb(info->base + S3C2410_RTCDATE);
204 rtc_tm->tm_mon = readb(info->base + S3C2410_RTCMON);
205 rtc_tm->tm_year = readb(info->base + S3C2410_RTCYEAR);
206 rtc_tm->tm_sec = readb(info->base + S3C2410_RTCSEC);
207
208 /* the only way to work out whether the system was mid-update
209 * when we read it is to check the second counter, and if it
210 * is zero, then we re-try the entire read
211 */
212
213 if (rtc_tm->tm_sec == 0 && !have_retried) {
214 have_retried = 1;
215 goto retry_get_time;
216 }
217
218 rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
219 rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
220 rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
221 rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
222 rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
223 rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);
224
225 s3c_rtc_disable_clk(info);
226
227 rtc_tm->tm_year += 100;
228
229 dev_dbg(dev, "read time %04d.%02d.%02d %02d:%02d:%02d\n",
230 1900 + rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday,
231 rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);
232
233 rtc_tm->tm_mon -= 1;
234
235 return 0;
236}
237
238static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
239{
240 struct s3c_rtc *info = dev_get_drvdata(dev);
241 int year = tm->tm_year - 100;
242 int ret;
243
244 dev_dbg(dev, "set time %04d.%02d.%02d %02d:%02d:%02d\n",
245 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
246 tm->tm_hour, tm->tm_min, tm->tm_sec);
247
248 /* we get around y2k by simply not supporting it */
249
250 if (year < 0 || year >= 100) {
251 dev_err(dev, "rtc only supports 100 years\n");
252 return -EINVAL;
253 }
254
255 ret = s3c_rtc_enable_clk(info);
256 if (ret)
257 return ret;
258
259 writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_RTCSEC);
260 writeb(bin2bcd(tm->tm_min), info->base + S3C2410_RTCMIN);
261 writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_RTCHOUR);
262 writeb(bin2bcd(tm->tm_mday), info->base + S3C2410_RTCDATE);
263 writeb(bin2bcd(tm->tm_mon + 1), info->base + S3C2410_RTCMON);
264 writeb(bin2bcd(year), info->base + S3C2410_RTCYEAR);
265
266 s3c_rtc_disable_clk(info);
267
268 return 0;
269}
270
271static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
272{
273 struct s3c_rtc *info = dev_get_drvdata(dev);
274 struct rtc_time *alm_tm = &alrm->time;
275 unsigned int alm_en;
276 int ret;
277
278 ret = s3c_rtc_enable_clk(info);
279 if (ret)
280 return ret;
281
282 alm_tm->tm_sec = readb(info->base + S3C2410_ALMSEC);
283 alm_tm->tm_min = readb(info->base + S3C2410_ALMMIN);
284 alm_tm->tm_hour = readb(info->base + S3C2410_ALMHOUR);
285 alm_tm->tm_mon = readb(info->base + S3C2410_ALMMON);
286 alm_tm->tm_mday = readb(info->base + S3C2410_ALMDATE);
287 alm_tm->tm_year = readb(info->base + S3C2410_ALMYEAR);
288
289 alm_en = readb(info->base + S3C2410_RTCALM);
290
291 s3c_rtc_disable_clk(info);
292
293 alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0;
294
295 dev_dbg(dev, "read alarm %d, %04d.%02d.%02d %02d:%02d:%02d\n",
296 alm_en,
297 1900 + alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday,
298 alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec);
299
300 /* decode the alarm enable field */
301 if (alm_en & S3C2410_RTCALM_SECEN)
302 alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec);
303
304 if (alm_en & S3C2410_RTCALM_MINEN)
305 alm_tm->tm_min = bcd2bin(alm_tm->tm_min);
306
307 if (alm_en & S3C2410_RTCALM_HOUREN)
308 alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour);
309
310 if (alm_en & S3C2410_RTCALM_DAYEN)
311 alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday);
312
313 if (alm_en & S3C2410_RTCALM_MONEN) {
314 alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon);
315 alm_tm->tm_mon -= 1;
316 }
317
318 if (alm_en & S3C2410_RTCALM_YEAREN)
319 alm_tm->tm_year = bcd2bin(alm_tm->tm_year);
320
321 return 0;
322}
323
324static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
325{
326 struct s3c_rtc *info = dev_get_drvdata(dev);
327 struct rtc_time *tm = &alrm->time;
328 unsigned int alrm_en;
329 int ret;
330 int year = tm->tm_year - 100;
331
332 dev_dbg(dev, "s3c_rtc_setalarm: %d, %04d.%02d.%02d %02d:%02d:%02d\n",
333 alrm->enabled,
334 1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday,
335 tm->tm_hour, tm->tm_min, tm->tm_sec);
336
337 ret = s3c_rtc_enable_clk(info);
338 if (ret)
339 return ret;
340
341 alrm_en = readb(info->base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
342 writeb(0x00, info->base + S3C2410_RTCALM);
343
344 if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
345 alrm_en |= S3C2410_RTCALM_SECEN;
346 writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_ALMSEC);
347 }
348
349 if (tm->tm_min < 60 && tm->tm_min >= 0) {
350 alrm_en |= S3C2410_RTCALM_MINEN;
351 writeb(bin2bcd(tm->tm_min), info->base + S3C2410_ALMMIN);
352 }
353
354 if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
355 alrm_en |= S3C2410_RTCALM_HOUREN;
356 writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_ALMHOUR);
357 }
358
359 if (year < 100 && year >= 0) {
360 alrm_en |= S3C2410_RTCALM_YEAREN;
361 writeb(bin2bcd(year), info->base + S3C2410_ALMYEAR);
362 }
363
364 if (tm->tm_mon < 12 && tm->tm_mon >= 0) {
365 alrm_en |= S3C2410_RTCALM_MONEN;
366 writeb(bin2bcd(tm->tm_mon + 1), info->base + S3C2410_ALMMON);
367 }
368
369 if (tm->tm_mday <= 31 && tm->tm_mday >= 1) {
370 alrm_en |= S3C2410_RTCALM_DAYEN;
371 writeb(bin2bcd(tm->tm_mday), info->base + S3C2410_ALMDATE);
372 }
373
374 dev_dbg(dev, "setting S3C2410_RTCALM to %08x\n", alrm_en);
375
376 writeb(alrm_en, info->base + S3C2410_RTCALM);
377
378 s3c_rtc_disable_clk(info);
379
380 s3c_rtc_setaie(dev, alrm->enabled);
381
382 return 0;
383}
384
385static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
386{
387 struct s3c_rtc *info = dev_get_drvdata(dev);
388 int ret;
389
390 ret = s3c_rtc_enable_clk(info);
391 if (ret)
392 return ret;
393
394 if (info->data->enable_tick)
395 info->data->enable_tick(info, seq);
396
397 s3c_rtc_disable_clk(info);
398
399 return 0;
400}
401
402static const struct rtc_class_ops s3c_rtcops = {
403 .read_time = s3c_rtc_gettime,
404 .set_time = s3c_rtc_settime,
405 .read_alarm = s3c_rtc_getalarm,
406 .set_alarm = s3c_rtc_setalarm,
407 .proc = s3c_rtc_proc,
408 .alarm_irq_enable = s3c_rtc_setaie,
409};
410
411static void s3c24xx_rtc_enable(struct s3c_rtc *info)
412{
413 unsigned int con, tmp;
414
415 con = readw(info->base + S3C2410_RTCCON);
416 /* re-enable the device, and check it is ok */
417 if ((con & S3C2410_RTCCON_RTCEN) == 0) {
418 dev_info(info->dev, "rtc disabled, re-enabling\n");
419
420 tmp = readw(info->base + S3C2410_RTCCON);
421 writew(tmp | S3C2410_RTCCON_RTCEN, info->base + S3C2410_RTCCON);
422 }
423
424 if (con & S3C2410_RTCCON_CNTSEL) {
425 dev_info(info->dev, "removing RTCCON_CNTSEL\n");
426
427 tmp = readw(info->base + S3C2410_RTCCON);
428 writew(tmp & ~S3C2410_RTCCON_CNTSEL,
429 info->base + S3C2410_RTCCON);
430 }
431
432 if (con & S3C2410_RTCCON_CLKRST) {
433 dev_info(info->dev, "removing RTCCON_CLKRST\n");
434
435 tmp = readw(info->base + S3C2410_RTCCON);
436 writew(tmp & ~S3C2410_RTCCON_CLKRST,
437 info->base + S3C2410_RTCCON);
438 }
439}
440
441static void s3c24xx_rtc_disable(struct s3c_rtc *info)
442{
443 unsigned int con;
444
445 con = readw(info->base + S3C2410_RTCCON);
446 con &= ~S3C2410_RTCCON_RTCEN;
447 writew(con, info->base + S3C2410_RTCCON);
448
449 con = readb(info->base + S3C2410_TICNT);
450 con &= ~S3C2410_TICNT_ENABLE;
451 writeb(con, info->base + S3C2410_TICNT);
452}
453
454static void s3c6410_rtc_disable(struct s3c_rtc *info)
455{
456 unsigned int con;
457
458 con = readw(info->base + S3C2410_RTCCON);
459 con &= ~S3C64XX_RTCCON_TICEN;
460 con &= ~S3C2410_RTCCON_RTCEN;
461 writew(con, info->base + S3C2410_RTCCON);
462}
463
464static int s3c_rtc_remove(struct platform_device *pdev)
465{
466 struct s3c_rtc *info = platform_get_drvdata(pdev);
467
468 s3c_rtc_setaie(info->dev, 0);
469
470 if (info->data->needs_src_clk)
471 clk_unprepare(info->rtc_src_clk);
472 clk_unprepare(info->rtc_clk);
473
474 return 0;
475}
476
477static const struct of_device_id s3c_rtc_dt_match[];
478
479static const struct s3c_rtc_data *s3c_rtc_get_data(struct platform_device *pdev)
480{
481 const struct of_device_id *match;
482
483 match = of_match_node(s3c_rtc_dt_match, pdev->dev.of_node);
484 return match->data;
485}
486
487static int s3c_rtc_probe(struct platform_device *pdev)
488{
489 struct s3c_rtc *info = NULL;
490 struct rtc_time rtc_tm;
491 struct resource *res;
492 int ret;
493
494 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
495 if (!info)
496 return -ENOMEM;
497
498 /* find the IRQs */
499 info->irq_tick = platform_get_irq(pdev, 1);
500 if (info->irq_tick < 0) {
501 dev_err(&pdev->dev, "no irq for rtc tick\n");
502 return info->irq_tick;
503 }
504
505 info->dev = &pdev->dev;
506 info->data = s3c_rtc_get_data(pdev);
507 if (!info->data) {
508 dev_err(&pdev->dev, "failed getting s3c_rtc_data\n");
509 return -EINVAL;
510 }
511 spin_lock_init(&info->pie_lock);
512 spin_lock_init(&info->alarm_clk_lock);
513
514 platform_set_drvdata(pdev, info);
515
516 info->irq_alarm = platform_get_irq(pdev, 0);
517 if (info->irq_alarm < 0) {
518 dev_err(&pdev->dev, "no irq for alarm\n");
519 return info->irq_alarm;
520 }
521
522 dev_dbg(&pdev->dev, "s3c2410_rtc: tick irq %d, alarm irq %d\n",
523 info->irq_tick, info->irq_alarm);
524
525 /* get the memory region */
526 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
527 info->base = devm_ioremap_resource(&pdev->dev, res);
528 if (IS_ERR(info->base))
529 return PTR_ERR(info->base);
530
531 info->rtc_clk = devm_clk_get(&pdev->dev, "rtc");
532 if (IS_ERR(info->rtc_clk)) {
533 ret = PTR_ERR(info->rtc_clk);
534 if (ret != -EPROBE_DEFER)
535 dev_err(&pdev->dev, "failed to find rtc clock\n");
536 else
537 dev_dbg(&pdev->dev, "probe deferred due to missing rtc clk\n");
538 return ret;
539 }
540 ret = clk_prepare_enable(info->rtc_clk);
541 if (ret)
542 return ret;
543
544 if (info->data->needs_src_clk) {
545 info->rtc_src_clk = devm_clk_get(&pdev->dev, "rtc_src");
546 if (IS_ERR(info->rtc_src_clk)) {
547 ret = PTR_ERR(info->rtc_src_clk);
548 if (ret != -EPROBE_DEFER)
549 dev_err(&pdev->dev,
550 "failed to find rtc source clock\n");
551 else
552 dev_dbg(&pdev->dev,
553 "probe deferred due to missing rtc src clk\n");
554 goto err_src_clk;
555 }
556 ret = clk_prepare_enable(info->rtc_src_clk);
557 if (ret)
558 goto err_src_clk;
559 }
560
561 /* check to see if everything is setup correctly */
562 if (info->data->enable)
563 info->data->enable(info);
564
565 dev_dbg(&pdev->dev, "s3c2410_rtc: RTCCON=%02x\n",
566 readw(info->base + S3C2410_RTCCON));
567
568 device_init_wakeup(&pdev->dev, 1);
569
570 /* Check RTC Time */
571 if (s3c_rtc_gettime(&pdev->dev, &rtc_tm)) {
572 rtc_tm.tm_year = 100;
573 rtc_tm.tm_mon = 0;
574 rtc_tm.tm_mday = 1;
575 rtc_tm.tm_hour = 0;
576 rtc_tm.tm_min = 0;
577 rtc_tm.tm_sec = 0;
578
579 s3c_rtc_settime(&pdev->dev, &rtc_tm);
580
581 dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n");
582 }
583
584 /* register RTC and exit */
585 info->rtc = devm_rtc_device_register(&pdev->dev, "s3c", &s3c_rtcops,
586 THIS_MODULE);
587 if (IS_ERR(info->rtc)) {
588 dev_err(&pdev->dev, "cannot attach rtc\n");
589 ret = PTR_ERR(info->rtc);
590 goto err_nortc;
591 }
592
593 ret = devm_request_irq(&pdev->dev, info->irq_alarm, s3c_rtc_alarmirq,
594 0, "s3c2410-rtc alarm", info);
595 if (ret) {
596 dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_alarm, ret);
597 goto err_nortc;
598 }
599
600 ret = devm_request_irq(&pdev->dev, info->irq_tick, s3c_rtc_tickirq,
601 0, "s3c2410-rtc tick", info);
602 if (ret) {
603 dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_tick, ret);
604 goto err_nortc;
605 }
606
607 if (info->data->select_tick_clk)
608 info->data->select_tick_clk(info);
609
610 s3c_rtc_setfreq(info, 1);
611
612 return 0;
613
614err_nortc:
615 if (info->data->disable)
616 info->data->disable(info);
617
618 if (info->data->needs_src_clk)
619 clk_disable_unprepare(info->rtc_src_clk);
620err_src_clk:
621 clk_disable_unprepare(info->rtc_clk);
622
623 return ret;
624}
625
626#ifdef CONFIG_PM_SLEEP
627
628static int s3c_rtc_suspend(struct device *dev)
629{
630 struct s3c_rtc *info = dev_get_drvdata(dev);
631 int ret;
632
633 ret = s3c_rtc_enable_clk(info);
634 if (ret)
635 return ret;
636
637 /* save TICNT for anyone using periodic interrupts */
638 if (info->data->save_tick_cnt)
639 info->data->save_tick_cnt(info);
640
641 if (info->data->disable)
642 info->data->disable(info);
643
644 if (device_may_wakeup(dev) && !info->wake_en) {
645 if (enable_irq_wake(info->irq_alarm) == 0)
646 info->wake_en = true;
647 else
648 dev_err(dev, "enable_irq_wake failed\n");
649 }
650
651 return 0;
652}
653
654static int s3c_rtc_resume(struct device *dev)
655{
656 struct s3c_rtc *info = dev_get_drvdata(dev);
657
658 if (info->data->enable)
659 info->data->enable(info);
660
661 if (info->data->restore_tick_cnt)
662 info->data->restore_tick_cnt(info);
663
664 s3c_rtc_disable_clk(info);
665
666 if (device_may_wakeup(dev) && info->wake_en) {
667 disable_irq_wake(info->irq_alarm);
668 info->wake_en = false;
669 }
670
671 return 0;
672}
673#endif
674static SIMPLE_DEV_PM_OPS(s3c_rtc_pm_ops, s3c_rtc_suspend, s3c_rtc_resume);
675
676static void s3c24xx_rtc_irq(struct s3c_rtc *info, int mask)
677{
678 rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF);
679}
680
681static void s3c6410_rtc_irq(struct s3c_rtc *info, int mask)
682{
683 rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF);
684 writeb(mask, info->base + S3C2410_INTP);
685}
686
687static void s3c2410_rtc_setfreq(struct s3c_rtc *info, int freq)
688{
689 unsigned int tmp = 0;
690 int val;
691
692 tmp = readb(info->base + S3C2410_TICNT);
693 tmp &= S3C2410_TICNT_ENABLE;
694
695 val = (info->rtc->max_user_freq / freq) - 1;
696 tmp |= val;
697
698 writel(tmp, info->base + S3C2410_TICNT);
699}
700
701static void s3c2416_rtc_setfreq(struct s3c_rtc *info, int freq)
702{
703 unsigned int tmp = 0;
704 int val;
705
706 tmp = readb(info->base + S3C2410_TICNT);
707 tmp &= S3C2410_TICNT_ENABLE;
708
709 val = (info->rtc->max_user_freq / freq) - 1;
710
711 tmp |= S3C2443_TICNT_PART(val);
712 writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1);
713
714 writel(S3C2416_TICNT2_PART(val), info->base + S3C2416_TICNT2);
715
716 writel(tmp, info->base + S3C2410_TICNT);
717}
718
719static void s3c2443_rtc_setfreq(struct s3c_rtc *info, int freq)
720{
721 unsigned int tmp = 0;
722 int val;
723
724 tmp = readb(info->base + S3C2410_TICNT);
725 tmp &= S3C2410_TICNT_ENABLE;
726
727 val = (info->rtc->max_user_freq / freq) - 1;
728
729 tmp |= S3C2443_TICNT_PART(val);
730 writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1);
731
732 writel(tmp, info->base + S3C2410_TICNT);
733}
734
735static void s3c6410_rtc_setfreq(struct s3c_rtc *info, int freq)
736{
737 int val;
738
739 val = (info->rtc->max_user_freq / freq) - 1;
740 writel(val, info->base + S3C2410_TICNT);
741}
742
743static void s3c24xx_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq)
744{
745 unsigned int ticnt;
746
747 ticnt = readb(info->base + S3C2410_TICNT);
748 ticnt &= S3C2410_TICNT_ENABLE;
749
750 seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no");
751}
752
753static void s3c2416_rtc_select_tick_clk(struct s3c_rtc *info)
754{
755 unsigned int con;
756
757 con = readw(info->base + S3C2410_RTCCON);
758 con |= S3C2443_RTCCON_TICSEL;
759 writew(con, info->base + S3C2410_RTCCON);
760}
761
762static void s3c6410_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq)
763{
764 unsigned int ticnt;
765
766 ticnt = readw(info->base + S3C2410_RTCCON);
767 ticnt &= S3C64XX_RTCCON_TICEN;
768
769 seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no");
770}
771
772static void s3c24xx_rtc_save_tick_cnt(struct s3c_rtc *info)
773{
774 info->ticnt_save = readb(info->base + S3C2410_TICNT);
775}
776
777static void s3c24xx_rtc_restore_tick_cnt(struct s3c_rtc *info)
778{
779 writeb(info->ticnt_save, info->base + S3C2410_TICNT);
780}
781
782static void s3c6410_rtc_save_tick_cnt(struct s3c_rtc *info)
783{
784 info->ticnt_en_save = readw(info->base + S3C2410_RTCCON);
785 info->ticnt_en_save &= S3C64XX_RTCCON_TICEN;
786 info->ticnt_save = readl(info->base + S3C2410_TICNT);
787}
788
789static void s3c6410_rtc_restore_tick_cnt(struct s3c_rtc *info)
790{
791 unsigned int con;
792
793 writel(info->ticnt_save, info->base + S3C2410_TICNT);
794 if (info->ticnt_en_save) {
795 con = readw(info->base + S3C2410_RTCCON);
796 writew(con | info->ticnt_en_save, info->base + S3C2410_RTCCON);
797 }
798}
799
800static struct s3c_rtc_data const s3c2410_rtc_data = {
801 .max_user_freq = 128,
802 .irq_handler = s3c24xx_rtc_irq,
803 .set_freq = s3c2410_rtc_setfreq,
804 .enable_tick = s3c24xx_rtc_enable_tick,
805 .save_tick_cnt = s3c24xx_rtc_save_tick_cnt,
806 .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt,
807 .enable = s3c24xx_rtc_enable,
808 .disable = s3c24xx_rtc_disable,
809};
810
811static struct s3c_rtc_data const s3c2416_rtc_data = {
812 .max_user_freq = 32768,
813 .irq_handler = s3c24xx_rtc_irq,
814 .set_freq = s3c2416_rtc_setfreq,
815 .enable_tick = s3c24xx_rtc_enable_tick,
816 .select_tick_clk = s3c2416_rtc_select_tick_clk,
817 .save_tick_cnt = s3c24xx_rtc_save_tick_cnt,
818 .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt,
819 .enable = s3c24xx_rtc_enable,
820 .disable = s3c24xx_rtc_disable,
821};
822
823static struct s3c_rtc_data const s3c2443_rtc_data = {
824 .max_user_freq = 32768,
825 .irq_handler = s3c24xx_rtc_irq,
826 .set_freq = s3c2443_rtc_setfreq,
827 .enable_tick = s3c24xx_rtc_enable_tick,
828 .select_tick_clk = s3c2416_rtc_select_tick_clk,
829 .save_tick_cnt = s3c24xx_rtc_save_tick_cnt,
830 .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt,
831 .enable = s3c24xx_rtc_enable,
832 .disable = s3c24xx_rtc_disable,
833};
834
835static struct s3c_rtc_data const s3c6410_rtc_data = {
836 .max_user_freq = 32768,
837 .needs_src_clk = true,
838 .irq_handler = s3c6410_rtc_irq,
839 .set_freq = s3c6410_rtc_setfreq,
840 .enable_tick = s3c6410_rtc_enable_tick,
841 .save_tick_cnt = s3c6410_rtc_save_tick_cnt,
842 .restore_tick_cnt = s3c6410_rtc_restore_tick_cnt,
843 .enable = s3c24xx_rtc_enable,
844 .disable = s3c6410_rtc_disable,
845};
846
847static const struct of_device_id s3c_rtc_dt_match[] = {
848 {
849 .compatible = "samsung,s3c2410-rtc",
850 .data = &s3c2410_rtc_data,
851 }, {
852 .compatible = "samsung,s3c2416-rtc",
853 .data = &s3c2416_rtc_data,
854 }, {
855 .compatible = "samsung,s3c2443-rtc",
856 .data = &s3c2443_rtc_data,
857 }, {
858 .compatible = "samsung,s3c6410-rtc",
859 .data = &s3c6410_rtc_data,
860 }, {
861 .compatible = "samsung,exynos3250-rtc",
862 .data = &s3c6410_rtc_data,
863 },
864 { /* sentinel */ },
865};
866MODULE_DEVICE_TABLE(of, s3c_rtc_dt_match);
867
868static struct platform_driver s3c_rtc_driver = {
869 .probe = s3c_rtc_probe,
870 .remove = s3c_rtc_remove,
871 .driver = {
872 .name = "s3c-rtc",
873 .pm = &s3c_rtc_pm_ops,
874 .of_match_table = of_match_ptr(s3c_rtc_dt_match),
875 },
876};
877module_platform_driver(s3c_rtc_driver);
878
879MODULE_DESCRIPTION("Samsung S3C RTC Driver");
880MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
881MODULE_LICENSE("GPL");
882MODULE_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 spinlock_t alarm_lock;
46
47 bool wake_en;
48};
49
50struct s3c_rtc_data {
51 bool needs_src_clk;
52
53 void (*irq_handler) (struct s3c_rtc *info, int mask);
54 void (*enable) (struct s3c_rtc *info);
55 void (*disable) (struct s3c_rtc *info);
56};
57
58static int s3c_rtc_enable_clk(struct s3c_rtc *info)
59{
60 int ret;
61
62 ret = clk_enable(info->rtc_clk);
63 if (ret)
64 return ret;
65
66 if (info->data->needs_src_clk) {
67 ret = clk_enable(info->rtc_src_clk);
68 if (ret) {
69 clk_disable(info->rtc_clk);
70 return ret;
71 }
72 }
73 return 0;
74}
75
76static void s3c_rtc_disable_clk(struct s3c_rtc *info)
77{
78 if (info->data->needs_src_clk)
79 clk_disable(info->rtc_src_clk);
80 clk_disable(info->rtc_clk);
81}
82
83/* IRQ Handler */
84static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)
85{
86 struct s3c_rtc *info = (struct s3c_rtc *)id;
87
88 if (info->data->irq_handler)
89 info->data->irq_handler(info, S3C2410_INTP_ALM);
90
91 return IRQ_HANDLED;
92}
93
94/* Update control registers */
95static int s3c_rtc_setaie(struct device *dev, unsigned int enabled)
96{
97 struct s3c_rtc *info = dev_get_drvdata(dev);
98 unsigned long flags;
99 unsigned int tmp;
100 int ret;
101
102 dev_dbg(info->dev, "%s: aie=%d\n", __func__, enabled);
103
104 ret = s3c_rtc_enable_clk(info);
105 if (ret)
106 return ret;
107
108 tmp = readb(info->base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
109
110 if (enabled)
111 tmp |= S3C2410_RTCALM_ALMEN;
112
113 writeb(tmp, info->base + S3C2410_RTCALM);
114
115 spin_lock_irqsave(&info->alarm_lock, flags);
116
117 if (info->alarm_enabled && !enabled)
118 s3c_rtc_disable_clk(info);
119 else if (!info->alarm_enabled && enabled)
120 ret = s3c_rtc_enable_clk(info);
121
122 info->alarm_enabled = enabled;
123 spin_unlock_irqrestore(&info->alarm_lock, flags);
124
125 s3c_rtc_disable_clk(info);
126
127 return ret;
128}
129
130/* Time read/write */
131static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
132{
133 struct s3c_rtc *info = dev_get_drvdata(dev);
134 unsigned int have_retried = 0;
135 int ret;
136
137 ret = s3c_rtc_enable_clk(info);
138 if (ret)
139 return ret;
140
141retry_get_time:
142 rtc_tm->tm_min = readb(info->base + S3C2410_RTCMIN);
143 rtc_tm->tm_hour = readb(info->base + S3C2410_RTCHOUR);
144 rtc_tm->tm_mday = readb(info->base + S3C2410_RTCDATE);
145 rtc_tm->tm_mon = readb(info->base + S3C2410_RTCMON);
146 rtc_tm->tm_year = readb(info->base + S3C2410_RTCYEAR);
147 rtc_tm->tm_sec = readb(info->base + S3C2410_RTCSEC);
148
149 /* the only way to work out whether the system was mid-update
150 * when we read it is to check the second counter, and if it
151 * is zero, then we re-try the entire read
152 */
153
154 if (rtc_tm->tm_sec == 0 && !have_retried) {
155 have_retried = 1;
156 goto retry_get_time;
157 }
158
159 rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
160 rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
161 rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
162 rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
163 rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
164 rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);
165
166 s3c_rtc_disable_clk(info);
167
168 rtc_tm->tm_year += 100;
169 rtc_tm->tm_mon -= 1;
170
171 dev_dbg(dev, "read time %ptR\n", rtc_tm);
172 return 0;
173}
174
175static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
176{
177 struct s3c_rtc *info = dev_get_drvdata(dev);
178 int year = tm->tm_year - 100;
179 int ret;
180
181 dev_dbg(dev, "set time %ptR\n", tm);
182
183 /* we get around y2k by simply not supporting it */
184
185 if (year < 0 || year >= 100) {
186 dev_err(dev, "rtc only supports 100 years\n");
187 return -EINVAL;
188 }
189
190 ret = s3c_rtc_enable_clk(info);
191 if (ret)
192 return ret;
193
194 writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_RTCSEC);
195 writeb(bin2bcd(tm->tm_min), info->base + S3C2410_RTCMIN);
196 writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_RTCHOUR);
197 writeb(bin2bcd(tm->tm_mday), info->base + S3C2410_RTCDATE);
198 writeb(bin2bcd(tm->tm_mon + 1), info->base + S3C2410_RTCMON);
199 writeb(bin2bcd(year), info->base + S3C2410_RTCYEAR);
200
201 s3c_rtc_disable_clk(info);
202
203 return 0;
204}
205
206static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
207{
208 struct s3c_rtc *info = dev_get_drvdata(dev);
209 struct rtc_time *alm_tm = &alrm->time;
210 unsigned int alm_en;
211 int ret;
212
213 ret = s3c_rtc_enable_clk(info);
214 if (ret)
215 return ret;
216
217 alm_tm->tm_sec = readb(info->base + S3C2410_ALMSEC);
218 alm_tm->tm_min = readb(info->base + S3C2410_ALMMIN);
219 alm_tm->tm_hour = readb(info->base + S3C2410_ALMHOUR);
220 alm_tm->tm_mon = readb(info->base + S3C2410_ALMMON);
221 alm_tm->tm_mday = readb(info->base + S3C2410_ALMDATE);
222 alm_tm->tm_year = readb(info->base + S3C2410_ALMYEAR);
223
224 alm_en = readb(info->base + S3C2410_RTCALM);
225
226 s3c_rtc_disable_clk(info);
227
228 alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0;
229
230 dev_dbg(dev, "read alarm %d, %ptR\n", alm_en, alm_tm);
231
232 /* decode the alarm enable field */
233 if (alm_en & S3C2410_RTCALM_SECEN)
234 alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec);
235
236 if (alm_en & S3C2410_RTCALM_MINEN)
237 alm_tm->tm_min = bcd2bin(alm_tm->tm_min);
238
239 if (alm_en & S3C2410_RTCALM_HOUREN)
240 alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour);
241
242 if (alm_en & S3C2410_RTCALM_DAYEN)
243 alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday);
244
245 if (alm_en & S3C2410_RTCALM_MONEN) {
246 alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon);
247 alm_tm->tm_mon -= 1;
248 }
249
250 if (alm_en & S3C2410_RTCALM_YEAREN)
251 alm_tm->tm_year = bcd2bin(alm_tm->tm_year);
252
253 return 0;
254}
255
256static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
257{
258 struct s3c_rtc *info = dev_get_drvdata(dev);
259 struct rtc_time *tm = &alrm->time;
260 unsigned int alrm_en;
261 int ret;
262
263 dev_dbg(dev, "s3c_rtc_setalarm: %d, %ptR\n", alrm->enabled, tm);
264
265 ret = s3c_rtc_enable_clk(info);
266 if (ret)
267 return ret;
268
269 alrm_en = readb(info->base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
270 writeb(0x00, info->base + S3C2410_RTCALM);
271
272 if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
273 alrm_en |= S3C2410_RTCALM_SECEN;
274 writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_ALMSEC);
275 }
276
277 if (tm->tm_min < 60 && tm->tm_min >= 0) {
278 alrm_en |= S3C2410_RTCALM_MINEN;
279 writeb(bin2bcd(tm->tm_min), info->base + S3C2410_ALMMIN);
280 }
281
282 if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
283 alrm_en |= S3C2410_RTCALM_HOUREN;
284 writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_ALMHOUR);
285 }
286
287 if (tm->tm_mon < 12 && tm->tm_mon >= 0) {
288 alrm_en |= S3C2410_RTCALM_MONEN;
289 writeb(bin2bcd(tm->tm_mon + 1), info->base + S3C2410_ALMMON);
290 }
291
292 if (tm->tm_mday <= 31 && tm->tm_mday >= 1) {
293 alrm_en |= S3C2410_RTCALM_DAYEN;
294 writeb(bin2bcd(tm->tm_mday), info->base + S3C2410_ALMDATE);
295 }
296
297 dev_dbg(dev, "setting S3C2410_RTCALM to %08x\n", alrm_en);
298
299 writeb(alrm_en, info->base + S3C2410_RTCALM);
300
301 s3c_rtc_setaie(dev, alrm->enabled);
302
303 s3c_rtc_disable_clk(info);
304
305 return 0;
306}
307
308static const struct rtc_class_ops s3c_rtcops = {
309 .read_time = s3c_rtc_gettime,
310 .set_time = s3c_rtc_settime,
311 .read_alarm = s3c_rtc_getalarm,
312 .set_alarm = s3c_rtc_setalarm,
313 .alarm_irq_enable = s3c_rtc_setaie,
314};
315
316static void s3c24xx_rtc_enable(struct s3c_rtc *info)
317{
318 unsigned int con, tmp;
319
320 con = readw(info->base + S3C2410_RTCCON);
321 /* re-enable the device, and check it is ok */
322 if ((con & S3C2410_RTCCON_RTCEN) == 0) {
323 dev_info(info->dev, "rtc disabled, re-enabling\n");
324
325 tmp = readw(info->base + S3C2410_RTCCON);
326 writew(tmp | S3C2410_RTCCON_RTCEN, info->base + S3C2410_RTCCON);
327 }
328
329 if (con & S3C2410_RTCCON_CNTSEL) {
330 dev_info(info->dev, "removing RTCCON_CNTSEL\n");
331
332 tmp = readw(info->base + S3C2410_RTCCON);
333 writew(tmp & ~S3C2410_RTCCON_CNTSEL,
334 info->base + S3C2410_RTCCON);
335 }
336
337 if (con & S3C2410_RTCCON_CLKRST) {
338 dev_info(info->dev, "removing RTCCON_CLKRST\n");
339
340 tmp = readw(info->base + S3C2410_RTCCON);
341 writew(tmp & ~S3C2410_RTCCON_CLKRST,
342 info->base + S3C2410_RTCCON);
343 }
344}
345
346static void s3c24xx_rtc_disable(struct s3c_rtc *info)
347{
348 unsigned int con;
349
350 con = readw(info->base + S3C2410_RTCCON);
351 con &= ~S3C2410_RTCCON_RTCEN;
352 writew(con, info->base + S3C2410_RTCCON);
353
354 con = readb(info->base + S3C2410_TICNT);
355 con &= ~S3C2410_TICNT_ENABLE;
356 writeb(con, info->base + S3C2410_TICNT);
357}
358
359static void s3c6410_rtc_disable(struct s3c_rtc *info)
360{
361 unsigned int con;
362
363 con = readw(info->base + S3C2410_RTCCON);
364 con &= ~S3C64XX_RTCCON_TICEN;
365 con &= ~S3C2410_RTCCON_RTCEN;
366 writew(con, info->base + S3C2410_RTCCON);
367}
368
369static int s3c_rtc_remove(struct platform_device *pdev)
370{
371 struct s3c_rtc *info = platform_get_drvdata(pdev);
372
373 s3c_rtc_setaie(info->dev, 0);
374
375 if (info->data->needs_src_clk)
376 clk_unprepare(info->rtc_src_clk);
377 clk_unprepare(info->rtc_clk);
378
379 return 0;
380}
381
382static int s3c_rtc_probe(struct platform_device *pdev)
383{
384 struct s3c_rtc *info = NULL;
385 int ret;
386
387 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
388 if (!info)
389 return -ENOMEM;
390
391 info->dev = &pdev->dev;
392 info->data = of_device_get_match_data(&pdev->dev);
393 if (!info->data) {
394 dev_err(&pdev->dev, "failed getting s3c_rtc_data\n");
395 return -EINVAL;
396 }
397 spin_lock_init(&info->alarm_lock);
398
399 platform_set_drvdata(pdev, info);
400
401 info->irq_alarm = platform_get_irq(pdev, 0);
402 if (info->irq_alarm < 0)
403 return info->irq_alarm;
404
405 dev_dbg(&pdev->dev, "s3c2410_rtc: alarm irq %d\n", info->irq_alarm);
406
407 /* get the memory region */
408 info->base = devm_platform_ioremap_resource(pdev, 0);
409 if (IS_ERR(info->base))
410 return PTR_ERR(info->base);
411
412 info->rtc_clk = devm_clk_get(&pdev->dev, "rtc");
413 if (IS_ERR(info->rtc_clk)) {
414 ret = PTR_ERR(info->rtc_clk);
415 if (ret != -EPROBE_DEFER)
416 dev_err(&pdev->dev, "failed to find rtc clock\n");
417 else
418 dev_dbg(&pdev->dev, "probe deferred due to missing rtc clk\n");
419 return ret;
420 }
421 ret = clk_prepare_enable(info->rtc_clk);
422 if (ret)
423 return ret;
424
425 if (info->data->needs_src_clk) {
426 info->rtc_src_clk = devm_clk_get(&pdev->dev, "rtc_src");
427 if (IS_ERR(info->rtc_src_clk)) {
428 ret = dev_err_probe(&pdev->dev, PTR_ERR(info->rtc_src_clk),
429 "failed to find rtc source clock\n");
430 goto err_src_clk;
431 }
432 ret = clk_prepare_enable(info->rtc_src_clk);
433 if (ret)
434 goto err_src_clk;
435 }
436
437 /* disable RTC enable bits potentially set by the bootloader */
438 if (info->data->disable)
439 info->data->disable(info);
440
441 /* check to see if everything is setup correctly */
442 if (info->data->enable)
443 info->data->enable(info);
444
445 dev_dbg(&pdev->dev, "s3c2410_rtc: RTCCON=%02x\n",
446 readw(info->base + S3C2410_RTCCON));
447
448 device_init_wakeup(&pdev->dev, 1);
449
450 /* register RTC and exit */
451 info->rtc = devm_rtc_device_register(&pdev->dev, "s3c", &s3c_rtcops,
452 THIS_MODULE);
453 if (IS_ERR(info->rtc)) {
454 dev_err(&pdev->dev, "cannot attach rtc\n");
455 ret = PTR_ERR(info->rtc);
456 goto err_nortc;
457 }
458
459 ret = devm_request_irq(&pdev->dev, info->irq_alarm, s3c_rtc_alarmirq,
460 0, "s3c2410-rtc alarm", info);
461 if (ret) {
462 dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_alarm, ret);
463 goto err_nortc;
464 }
465
466 s3c_rtc_disable_clk(info);
467
468 return 0;
469
470err_nortc:
471 if (info->data->disable)
472 info->data->disable(info);
473
474 if (info->data->needs_src_clk)
475 clk_disable_unprepare(info->rtc_src_clk);
476err_src_clk:
477 clk_disable_unprepare(info->rtc_clk);
478
479 return ret;
480}
481
482#ifdef CONFIG_PM_SLEEP
483
484static int s3c_rtc_suspend(struct device *dev)
485{
486 struct s3c_rtc *info = dev_get_drvdata(dev);
487 int ret;
488
489 ret = s3c_rtc_enable_clk(info);
490 if (ret)
491 return ret;
492
493 if (info->data->disable)
494 info->data->disable(info);
495
496 if (device_may_wakeup(dev) && !info->wake_en) {
497 if (enable_irq_wake(info->irq_alarm) == 0)
498 info->wake_en = true;
499 else
500 dev_err(dev, "enable_irq_wake failed\n");
501 }
502
503 return 0;
504}
505
506static int s3c_rtc_resume(struct device *dev)
507{
508 struct s3c_rtc *info = dev_get_drvdata(dev);
509
510 if (info->data->enable)
511 info->data->enable(info);
512
513 s3c_rtc_disable_clk(info);
514
515 if (device_may_wakeup(dev) && info->wake_en) {
516 disable_irq_wake(info->irq_alarm);
517 info->wake_en = false;
518 }
519
520 return 0;
521}
522#endif
523static SIMPLE_DEV_PM_OPS(s3c_rtc_pm_ops, s3c_rtc_suspend, s3c_rtc_resume);
524
525static void s3c24xx_rtc_irq(struct s3c_rtc *info, int mask)
526{
527 rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF);
528}
529
530static void s3c6410_rtc_irq(struct s3c_rtc *info, int mask)
531{
532 rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF);
533 writeb(mask, info->base + S3C2410_INTP);
534}
535
536static struct s3c_rtc_data const s3c2410_rtc_data = {
537 .irq_handler = s3c24xx_rtc_irq,
538 .enable = s3c24xx_rtc_enable,
539 .disable = s3c24xx_rtc_disable,
540};
541
542static struct s3c_rtc_data const s3c2416_rtc_data = {
543 .irq_handler = s3c24xx_rtc_irq,
544 .enable = s3c24xx_rtc_enable,
545 .disable = s3c24xx_rtc_disable,
546};
547
548static struct s3c_rtc_data const s3c2443_rtc_data = {
549 .irq_handler = s3c24xx_rtc_irq,
550 .enable = s3c24xx_rtc_enable,
551 .disable = s3c24xx_rtc_disable,
552};
553
554static struct s3c_rtc_data const s3c6410_rtc_data = {
555 .needs_src_clk = true,
556 .irq_handler = s3c6410_rtc_irq,
557 .enable = s3c24xx_rtc_enable,
558 .disable = s3c6410_rtc_disable,
559};
560
561static const __maybe_unused struct of_device_id s3c_rtc_dt_match[] = {
562 {
563 .compatible = "samsung,s3c2410-rtc",
564 .data = &s3c2410_rtc_data,
565 }, {
566 .compatible = "samsung,s3c2416-rtc",
567 .data = &s3c2416_rtc_data,
568 }, {
569 .compatible = "samsung,s3c2443-rtc",
570 .data = &s3c2443_rtc_data,
571 }, {
572 .compatible = "samsung,s3c6410-rtc",
573 .data = &s3c6410_rtc_data,
574 }, {
575 .compatible = "samsung,exynos3250-rtc",
576 .data = &s3c6410_rtc_data,
577 },
578 { /* sentinel */ },
579};
580MODULE_DEVICE_TABLE(of, s3c_rtc_dt_match);
581
582static struct platform_driver s3c_rtc_driver = {
583 .probe = s3c_rtc_probe,
584 .remove = s3c_rtc_remove,
585 .driver = {
586 .name = "s3c-rtc",
587 .pm = &s3c_rtc_pm_ops,
588 .of_match_table = of_match_ptr(s3c_rtc_dt_match),
589 },
590};
591module_platform_driver(s3c_rtc_driver);
592
593MODULE_DESCRIPTION("Samsung S3C RTC Driver");
594MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
595MODULE_LICENSE("GPL");
596MODULE_ALIAS("platform:s3c2410-rtc");