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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/uaccess.h>
27#include <linux/io.h>
28
29#include <asm/irq.h>
30#include "rtc-s3c.h"
31
32struct s3c_rtc {
33 struct device *dev;
34 struct rtc_device *rtc;
35
36 void __iomem *base;
37 struct clk *rtc_clk;
38 struct clk *rtc_src_clk;
39 bool alarm_enabled;
40
41 const struct s3c_rtc_data *data;
42
43 int irq_alarm;
44 spinlock_t alarm_lock;
45
46 bool wake_en;
47};
48
49struct s3c_rtc_data {
50 bool needs_src_clk;
51
52 void (*irq_handler) (struct s3c_rtc *info, int mask);
53 void (*enable) (struct s3c_rtc *info);
54 void (*disable) (struct s3c_rtc *info);
55};
56
57static int s3c_rtc_enable_clk(struct s3c_rtc *info)
58{
59 int ret;
60
61 ret = clk_enable(info->rtc_clk);
62 if (ret)
63 return ret;
64
65 if (info->data->needs_src_clk) {
66 ret = clk_enable(info->rtc_src_clk);
67 if (ret) {
68 clk_disable(info->rtc_clk);
69 return ret;
70 }
71 }
72 return 0;
73}
74
75static void s3c_rtc_disable_clk(struct s3c_rtc *info)
76{
77 if (info->data->needs_src_clk)
78 clk_disable(info->rtc_src_clk);
79 clk_disable(info->rtc_clk);
80}
81
82/* IRQ Handler */
83static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)
84{
85 struct s3c_rtc *info = (struct s3c_rtc *)id;
86
87 if (info->data->irq_handler)
88 info->data->irq_handler(info, S3C2410_INTP_ALM);
89
90 return IRQ_HANDLED;
91}
92
93/* Update control registers */
94static int s3c_rtc_setaie(struct device *dev, unsigned int enabled)
95{
96 struct s3c_rtc *info = dev_get_drvdata(dev);
97 unsigned long flags;
98 unsigned int tmp;
99 int ret;
100
101 dev_dbg(info->dev, "%s: aie=%d\n", __func__, enabled);
102
103 ret = s3c_rtc_enable_clk(info);
104 if (ret)
105 return ret;
106
107 tmp = readb(info->base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
108
109 if (enabled)
110 tmp |= S3C2410_RTCALM_ALMEN;
111
112 writeb(tmp, info->base + S3C2410_RTCALM);
113
114 spin_lock_irqsave(&info->alarm_lock, flags);
115
116 if (info->alarm_enabled && !enabled)
117 s3c_rtc_disable_clk(info);
118 else if (!info->alarm_enabled && enabled)
119 ret = s3c_rtc_enable_clk(info);
120
121 info->alarm_enabled = enabled;
122 spin_unlock_irqrestore(&info->alarm_lock, flags);
123
124 s3c_rtc_disable_clk(info);
125
126 return ret;
127}
128
129/* Read time from RTC and convert it from BCD */
130static int s3c_rtc_read_time(struct s3c_rtc *info, struct rtc_time *tm)
131{
132 unsigned int have_retried = 0;
133 int ret;
134
135 ret = s3c_rtc_enable_clk(info);
136 if (ret)
137 return ret;
138
139retry_get_time:
140 tm->tm_min = readb(info->base + S3C2410_RTCMIN);
141 tm->tm_hour = readb(info->base + S3C2410_RTCHOUR);
142 tm->tm_mday = readb(info->base + S3C2410_RTCDATE);
143 tm->tm_mon = readb(info->base + S3C2410_RTCMON);
144 tm->tm_year = readb(info->base + S3C2410_RTCYEAR);
145 tm->tm_sec = readb(info->base + S3C2410_RTCSEC);
146
147 /*
148 * The only way to work out whether the system was mid-update
149 * when we read it is to check the second counter, and if it
150 * is zero, then we re-try the entire read
151 */
152 if (tm->tm_sec == 0 && !have_retried) {
153 have_retried = 1;
154 goto retry_get_time;
155 }
156
157 s3c_rtc_disable_clk(info);
158
159 tm->tm_sec = bcd2bin(tm->tm_sec);
160 tm->tm_min = bcd2bin(tm->tm_min);
161 tm->tm_hour = bcd2bin(tm->tm_hour);
162 tm->tm_mday = bcd2bin(tm->tm_mday);
163 tm->tm_mon = bcd2bin(tm->tm_mon);
164 tm->tm_year = bcd2bin(tm->tm_year);
165
166 return 0;
167}
168
169/* Convert time to BCD and write it to RTC */
170static int s3c_rtc_write_time(struct s3c_rtc *info, const struct rtc_time *tm)
171{
172 int ret;
173
174 ret = s3c_rtc_enable_clk(info);
175 if (ret)
176 return ret;
177
178 writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_RTCSEC);
179 writeb(bin2bcd(tm->tm_min), info->base + S3C2410_RTCMIN);
180 writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_RTCHOUR);
181 writeb(bin2bcd(tm->tm_mday), info->base + S3C2410_RTCDATE);
182 writeb(bin2bcd(tm->tm_mon), info->base + S3C2410_RTCMON);
183 writeb(bin2bcd(tm->tm_year), info->base + S3C2410_RTCYEAR);
184
185 s3c_rtc_disable_clk(info);
186
187 return 0;
188}
189
190static int s3c_rtc_gettime(struct device *dev, struct rtc_time *tm)
191{
192 struct s3c_rtc *info = dev_get_drvdata(dev);
193 int ret;
194
195 ret = s3c_rtc_read_time(info, tm);
196 if (ret)
197 return ret;
198
199 /* Convert internal representation to actual date/time */
200 tm->tm_year += 100;
201 tm->tm_mon -= 1;
202
203 dev_dbg(dev, "read time %ptR\n", tm);
204 return 0;
205}
206
207static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
208{
209 struct s3c_rtc *info = dev_get_drvdata(dev);
210 struct rtc_time rtc_tm = *tm;
211
212 dev_dbg(dev, "set time %ptR\n", tm);
213
214 /*
215 * Convert actual date/time to internal representation.
216 * We get around Y2K by simply not supporting it.
217 */
218 rtc_tm.tm_year -= 100;
219 rtc_tm.tm_mon += 1;
220
221 return s3c_rtc_write_time(info, &rtc_tm);
222}
223
224static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
225{
226 struct s3c_rtc *info = dev_get_drvdata(dev);
227 struct rtc_time *alm_tm = &alrm->time;
228 unsigned int alm_en;
229 int ret;
230
231 ret = s3c_rtc_enable_clk(info);
232 if (ret)
233 return ret;
234
235 alm_tm->tm_sec = readb(info->base + S3C2410_ALMSEC);
236 alm_tm->tm_min = readb(info->base + S3C2410_ALMMIN);
237 alm_tm->tm_hour = readb(info->base + S3C2410_ALMHOUR);
238 alm_tm->tm_mon = readb(info->base + S3C2410_ALMMON);
239 alm_tm->tm_mday = readb(info->base + S3C2410_ALMDATE);
240 alm_tm->tm_year = readb(info->base + S3C2410_ALMYEAR);
241
242 alm_en = readb(info->base + S3C2410_RTCALM);
243
244 s3c_rtc_disable_clk(info);
245
246 alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0;
247
248 dev_dbg(dev, "read alarm %d, %ptR\n", alm_en, alm_tm);
249
250 /* decode the alarm enable field */
251 if (alm_en & S3C2410_RTCALM_SECEN)
252 alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec);
253
254 if (alm_en & S3C2410_RTCALM_MINEN)
255 alm_tm->tm_min = bcd2bin(alm_tm->tm_min);
256
257 if (alm_en & S3C2410_RTCALM_HOUREN)
258 alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour);
259
260 if (alm_en & S3C2410_RTCALM_DAYEN)
261 alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday);
262
263 if (alm_en & S3C2410_RTCALM_MONEN) {
264 alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon);
265 alm_tm->tm_mon -= 1;
266 }
267
268 if (alm_en & S3C2410_RTCALM_YEAREN)
269 alm_tm->tm_year = bcd2bin(alm_tm->tm_year);
270
271 return 0;
272}
273
274static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
275{
276 struct s3c_rtc *info = dev_get_drvdata(dev);
277 struct rtc_time *tm = &alrm->time;
278 unsigned int alrm_en;
279 int ret;
280
281 dev_dbg(dev, "s3c_rtc_setalarm: %d, %ptR\n", alrm->enabled, tm);
282
283 ret = s3c_rtc_enable_clk(info);
284 if (ret)
285 return ret;
286
287 alrm_en = readb(info->base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
288 writeb(0x00, info->base + S3C2410_RTCALM);
289
290 if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
291 alrm_en |= S3C2410_RTCALM_SECEN;
292 writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_ALMSEC);
293 }
294
295 if (tm->tm_min < 60 && tm->tm_min >= 0) {
296 alrm_en |= S3C2410_RTCALM_MINEN;
297 writeb(bin2bcd(tm->tm_min), info->base + S3C2410_ALMMIN);
298 }
299
300 if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
301 alrm_en |= S3C2410_RTCALM_HOUREN;
302 writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_ALMHOUR);
303 }
304
305 if (tm->tm_mon < 12 && tm->tm_mon >= 0) {
306 alrm_en |= S3C2410_RTCALM_MONEN;
307 writeb(bin2bcd(tm->tm_mon + 1), info->base + S3C2410_ALMMON);
308 }
309
310 if (tm->tm_mday <= 31 && tm->tm_mday >= 1) {
311 alrm_en |= S3C2410_RTCALM_DAYEN;
312 writeb(bin2bcd(tm->tm_mday), info->base + S3C2410_ALMDATE);
313 }
314
315 dev_dbg(dev, "setting S3C2410_RTCALM to %08x\n", alrm_en);
316
317 writeb(alrm_en, info->base + S3C2410_RTCALM);
318
319 s3c_rtc_setaie(dev, alrm->enabled);
320
321 s3c_rtc_disable_clk(info);
322
323 return 0;
324}
325
326static const struct rtc_class_ops s3c_rtcops = {
327 .read_time = s3c_rtc_gettime,
328 .set_time = s3c_rtc_settime,
329 .read_alarm = s3c_rtc_getalarm,
330 .set_alarm = s3c_rtc_setalarm,
331 .alarm_irq_enable = s3c_rtc_setaie,
332};
333
334static void s3c24xx_rtc_enable(struct s3c_rtc *info)
335{
336 unsigned int con, tmp;
337
338 con = readw(info->base + S3C2410_RTCCON);
339 /* re-enable the device, and check it is ok */
340 if ((con & S3C2410_RTCCON_RTCEN) == 0) {
341 dev_info(info->dev, "rtc disabled, re-enabling\n");
342
343 tmp = readw(info->base + S3C2410_RTCCON);
344 writew(tmp | S3C2410_RTCCON_RTCEN, info->base + S3C2410_RTCCON);
345 }
346
347 if (con & S3C2410_RTCCON_CNTSEL) {
348 dev_info(info->dev, "removing RTCCON_CNTSEL\n");
349
350 tmp = readw(info->base + S3C2410_RTCCON);
351 writew(tmp & ~S3C2410_RTCCON_CNTSEL,
352 info->base + S3C2410_RTCCON);
353 }
354
355 if (con & S3C2410_RTCCON_CLKRST) {
356 dev_info(info->dev, "removing RTCCON_CLKRST\n");
357
358 tmp = readw(info->base + S3C2410_RTCCON);
359 writew(tmp & ~S3C2410_RTCCON_CLKRST,
360 info->base + S3C2410_RTCCON);
361 }
362}
363
364static void s3c24xx_rtc_disable(struct s3c_rtc *info)
365{
366 unsigned int con;
367
368 con = readw(info->base + S3C2410_RTCCON);
369 con &= ~S3C2410_RTCCON_RTCEN;
370 writew(con, info->base + S3C2410_RTCCON);
371
372 con = readb(info->base + S3C2410_TICNT);
373 con &= ~S3C2410_TICNT_ENABLE;
374 writeb(con, info->base + S3C2410_TICNT);
375}
376
377static void s3c6410_rtc_disable(struct s3c_rtc *info)
378{
379 unsigned int con;
380
381 con = readw(info->base + S3C2410_RTCCON);
382 con &= ~S3C64XX_RTCCON_TICEN;
383 con &= ~S3C2410_RTCCON_RTCEN;
384 writew(con, info->base + S3C2410_RTCCON);
385}
386
387static void s3c_rtc_remove(struct platform_device *pdev)
388{
389 struct s3c_rtc *info = platform_get_drvdata(pdev);
390
391 s3c_rtc_setaie(info->dev, 0);
392
393 if (info->data->needs_src_clk)
394 clk_unprepare(info->rtc_src_clk);
395 clk_unprepare(info->rtc_clk);
396}
397
398static int s3c_rtc_probe(struct platform_device *pdev)
399{
400 struct s3c_rtc *info = NULL;
401 int ret;
402
403 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
404 if (!info)
405 return -ENOMEM;
406
407 info->dev = &pdev->dev;
408 info->data = of_device_get_match_data(&pdev->dev);
409 if (!info->data) {
410 dev_err(&pdev->dev, "failed getting s3c_rtc_data\n");
411 return -EINVAL;
412 }
413 spin_lock_init(&info->alarm_lock);
414
415 platform_set_drvdata(pdev, info);
416
417 info->irq_alarm = platform_get_irq(pdev, 0);
418 if (info->irq_alarm < 0)
419 return info->irq_alarm;
420
421 dev_dbg(&pdev->dev, "s3c2410_rtc: alarm irq %d\n", info->irq_alarm);
422
423 /* get the memory region */
424 info->base = devm_platform_ioremap_resource(pdev, 0);
425 if (IS_ERR(info->base))
426 return PTR_ERR(info->base);
427
428 info->rtc_clk = devm_clk_get(&pdev->dev, "rtc");
429 if (IS_ERR(info->rtc_clk))
430 return dev_err_probe(&pdev->dev, PTR_ERR(info->rtc_clk),
431 "failed to find rtc clock\n");
432 ret = clk_prepare_enable(info->rtc_clk);
433 if (ret)
434 return ret;
435
436 if (info->data->needs_src_clk) {
437 info->rtc_src_clk = devm_clk_get(&pdev->dev, "rtc_src");
438 if (IS_ERR(info->rtc_src_clk)) {
439 ret = dev_err_probe(&pdev->dev, PTR_ERR(info->rtc_src_clk),
440 "failed to find rtc source clock\n");
441 goto err_src_clk;
442 }
443 ret = clk_prepare_enable(info->rtc_src_clk);
444 if (ret)
445 goto err_src_clk;
446 }
447
448 /* disable RTC enable bits potentially set by the bootloader */
449 if (info->data->disable)
450 info->data->disable(info);
451
452 /* check to see if everything is setup correctly */
453 if (info->data->enable)
454 info->data->enable(info);
455
456 dev_dbg(&pdev->dev, "s3c2410_rtc: RTCCON=%02x\n",
457 readw(info->base + S3C2410_RTCCON));
458
459 device_init_wakeup(&pdev->dev, 1);
460
461 info->rtc = devm_rtc_allocate_device(&pdev->dev);
462 if (IS_ERR(info->rtc)) {
463 ret = PTR_ERR(info->rtc);
464 goto err_nortc;
465 }
466
467 info->rtc->ops = &s3c_rtcops;
468 info->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
469 info->rtc->range_max = RTC_TIMESTAMP_END_2099;
470
471 ret = devm_rtc_register_device(info->rtc);
472 if (ret)
473 goto err_nortc;
474
475 ret = devm_request_irq(&pdev->dev, info->irq_alarm, s3c_rtc_alarmirq,
476 0, "s3c2410-rtc alarm", info);
477 if (ret) {
478 dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_alarm, ret);
479 goto err_nortc;
480 }
481
482 s3c_rtc_disable_clk(info);
483
484 return 0;
485
486err_nortc:
487 if (info->data->disable)
488 info->data->disable(info);
489
490 if (info->data->needs_src_clk)
491 clk_disable_unprepare(info->rtc_src_clk);
492err_src_clk:
493 clk_disable_unprepare(info->rtc_clk);
494
495 return ret;
496}
497
498#ifdef CONFIG_PM_SLEEP
499
500static int s3c_rtc_suspend(struct device *dev)
501{
502 struct s3c_rtc *info = dev_get_drvdata(dev);
503 int ret;
504
505 ret = s3c_rtc_enable_clk(info);
506 if (ret)
507 return ret;
508
509 if (info->data->disable)
510 info->data->disable(info);
511
512 if (device_may_wakeup(dev) && !info->wake_en) {
513 if (enable_irq_wake(info->irq_alarm) == 0)
514 info->wake_en = true;
515 else
516 dev_err(dev, "enable_irq_wake failed\n");
517 }
518
519 return 0;
520}
521
522static int s3c_rtc_resume(struct device *dev)
523{
524 struct s3c_rtc *info = dev_get_drvdata(dev);
525
526 if (info->data->enable)
527 info->data->enable(info);
528
529 s3c_rtc_disable_clk(info);
530
531 if (device_may_wakeup(dev) && info->wake_en) {
532 disable_irq_wake(info->irq_alarm);
533 info->wake_en = false;
534 }
535
536 return 0;
537}
538#endif
539static SIMPLE_DEV_PM_OPS(s3c_rtc_pm_ops, s3c_rtc_suspend, s3c_rtc_resume);
540
541static void s3c24xx_rtc_irq(struct s3c_rtc *info, int mask)
542{
543 rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF);
544}
545
546static void s3c6410_rtc_irq(struct s3c_rtc *info, int mask)
547{
548 rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF);
549 writeb(mask, info->base + S3C2410_INTP);
550}
551
552static struct s3c_rtc_data const s3c2410_rtc_data = {
553 .irq_handler = s3c24xx_rtc_irq,
554 .enable = s3c24xx_rtc_enable,
555 .disable = s3c24xx_rtc_disable,
556};
557
558static struct s3c_rtc_data const s3c2416_rtc_data = {
559 .irq_handler = s3c24xx_rtc_irq,
560 .enable = s3c24xx_rtc_enable,
561 .disable = s3c24xx_rtc_disable,
562};
563
564static struct s3c_rtc_data const s3c2443_rtc_data = {
565 .irq_handler = s3c24xx_rtc_irq,
566 .enable = s3c24xx_rtc_enable,
567 .disable = s3c24xx_rtc_disable,
568};
569
570static struct s3c_rtc_data const s3c6410_rtc_data = {
571 .needs_src_clk = true,
572 .irq_handler = s3c6410_rtc_irq,
573 .enable = s3c24xx_rtc_enable,
574 .disable = s3c6410_rtc_disable,
575};
576
577static const __maybe_unused struct of_device_id s3c_rtc_dt_match[] = {
578 {
579 .compatible = "samsung,s3c2410-rtc",
580 .data = &s3c2410_rtc_data,
581 }, {
582 .compatible = "samsung,s3c2416-rtc",
583 .data = &s3c2416_rtc_data,
584 }, {
585 .compatible = "samsung,s3c2443-rtc",
586 .data = &s3c2443_rtc_data,
587 }, {
588 .compatible = "samsung,s3c6410-rtc",
589 .data = &s3c6410_rtc_data,
590 }, {
591 .compatible = "samsung,exynos3250-rtc",
592 .data = &s3c6410_rtc_data,
593 },
594 { /* sentinel */ },
595};
596MODULE_DEVICE_TABLE(of, s3c_rtc_dt_match);
597
598static struct platform_driver s3c_rtc_driver = {
599 .probe = s3c_rtc_probe,
600 .remove = s3c_rtc_remove,
601 .driver = {
602 .name = "s3c-rtc",
603 .pm = &s3c_rtc_pm_ops,
604 .of_match_table = of_match_ptr(s3c_rtc_dt_match),
605 },
606};
607module_platform_driver(s3c_rtc_driver);
608
609MODULE_DESCRIPTION("Samsung S3C RTC Driver");
610MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
611MODULE_LICENSE("GPL");
612MODULE_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/* Read time from RTC and convert it from BCD */
131static int s3c_rtc_read_time(struct s3c_rtc *info, struct rtc_time *tm)
132{
133 unsigned int have_retried = 0;
134 int ret;
135
136 ret = s3c_rtc_enable_clk(info);
137 if (ret)
138 return ret;
139
140retry_get_time:
141 tm->tm_min = readb(info->base + S3C2410_RTCMIN);
142 tm->tm_hour = readb(info->base + S3C2410_RTCHOUR);
143 tm->tm_mday = readb(info->base + S3C2410_RTCDATE);
144 tm->tm_mon = readb(info->base + S3C2410_RTCMON);
145 tm->tm_year = readb(info->base + S3C2410_RTCYEAR);
146 tm->tm_sec = readb(info->base + S3C2410_RTCSEC);
147
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 if (tm->tm_sec == 0 && !have_retried) {
154 have_retried = 1;
155 goto retry_get_time;
156 }
157
158 s3c_rtc_disable_clk(info);
159
160 tm->tm_sec = bcd2bin(tm->tm_sec);
161 tm->tm_min = bcd2bin(tm->tm_min);
162 tm->tm_hour = bcd2bin(tm->tm_hour);
163 tm->tm_mday = bcd2bin(tm->tm_mday);
164 tm->tm_mon = bcd2bin(tm->tm_mon);
165 tm->tm_year = bcd2bin(tm->tm_year);
166
167 return 0;
168}
169
170/* Convert time to BCD and write it to RTC */
171static int s3c_rtc_write_time(struct s3c_rtc *info, const struct rtc_time *tm)
172{
173 int ret;
174
175 ret = s3c_rtc_enable_clk(info);
176 if (ret)
177 return ret;
178
179 writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_RTCSEC);
180 writeb(bin2bcd(tm->tm_min), info->base + S3C2410_RTCMIN);
181 writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_RTCHOUR);
182 writeb(bin2bcd(tm->tm_mday), info->base + S3C2410_RTCDATE);
183 writeb(bin2bcd(tm->tm_mon), info->base + S3C2410_RTCMON);
184 writeb(bin2bcd(tm->tm_year), info->base + S3C2410_RTCYEAR);
185
186 s3c_rtc_disable_clk(info);
187
188 return 0;
189}
190
191static int s3c_rtc_gettime(struct device *dev, struct rtc_time *tm)
192{
193 struct s3c_rtc *info = dev_get_drvdata(dev);
194 int ret;
195
196 ret = s3c_rtc_read_time(info, tm);
197 if (ret)
198 return ret;
199
200 /* Convert internal representation to actual date/time */
201 tm->tm_year += 100;
202 tm->tm_mon -= 1;
203
204 dev_dbg(dev, "read time %ptR\n", tm);
205 return 0;
206}
207
208static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
209{
210 struct s3c_rtc *info = dev_get_drvdata(dev);
211 struct rtc_time rtc_tm = *tm;
212
213 dev_dbg(dev, "set time %ptR\n", tm);
214
215 /*
216 * Convert actual date/time to internal representation.
217 * We get around Y2K by simply not supporting it.
218 */
219 rtc_tm.tm_year -= 100;
220 rtc_tm.tm_mon += 1;
221
222 return s3c_rtc_write_time(info, &rtc_tm);
223}
224
225static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
226{
227 struct s3c_rtc *info = dev_get_drvdata(dev);
228 struct rtc_time *alm_tm = &alrm->time;
229 unsigned int alm_en;
230 int ret;
231
232 ret = s3c_rtc_enable_clk(info);
233 if (ret)
234 return ret;
235
236 alm_tm->tm_sec = readb(info->base + S3C2410_ALMSEC);
237 alm_tm->tm_min = readb(info->base + S3C2410_ALMMIN);
238 alm_tm->tm_hour = readb(info->base + S3C2410_ALMHOUR);
239 alm_tm->tm_mon = readb(info->base + S3C2410_ALMMON);
240 alm_tm->tm_mday = readb(info->base + S3C2410_ALMDATE);
241 alm_tm->tm_year = readb(info->base + S3C2410_ALMYEAR);
242
243 alm_en = readb(info->base + S3C2410_RTCALM);
244
245 s3c_rtc_disable_clk(info);
246
247 alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0;
248
249 dev_dbg(dev, "read alarm %d, %ptR\n", alm_en, alm_tm);
250
251 /* decode the alarm enable field */
252 if (alm_en & S3C2410_RTCALM_SECEN)
253 alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec);
254
255 if (alm_en & S3C2410_RTCALM_MINEN)
256 alm_tm->tm_min = bcd2bin(alm_tm->tm_min);
257
258 if (alm_en & S3C2410_RTCALM_HOUREN)
259 alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour);
260
261 if (alm_en & S3C2410_RTCALM_DAYEN)
262 alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday);
263
264 if (alm_en & S3C2410_RTCALM_MONEN) {
265 alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon);
266 alm_tm->tm_mon -= 1;
267 }
268
269 if (alm_en & S3C2410_RTCALM_YEAREN)
270 alm_tm->tm_year = bcd2bin(alm_tm->tm_year);
271
272 return 0;
273}
274
275static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
276{
277 struct s3c_rtc *info = dev_get_drvdata(dev);
278 struct rtc_time *tm = &alrm->time;
279 unsigned int alrm_en;
280 int ret;
281
282 dev_dbg(dev, "s3c_rtc_setalarm: %d, %ptR\n", alrm->enabled, tm);
283
284 ret = s3c_rtc_enable_clk(info);
285 if (ret)
286 return ret;
287
288 alrm_en = readb(info->base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
289 writeb(0x00, info->base + S3C2410_RTCALM);
290
291 if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
292 alrm_en |= S3C2410_RTCALM_SECEN;
293 writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_ALMSEC);
294 }
295
296 if (tm->tm_min < 60 && tm->tm_min >= 0) {
297 alrm_en |= S3C2410_RTCALM_MINEN;
298 writeb(bin2bcd(tm->tm_min), info->base + S3C2410_ALMMIN);
299 }
300
301 if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
302 alrm_en |= S3C2410_RTCALM_HOUREN;
303 writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_ALMHOUR);
304 }
305
306 if (tm->tm_mon < 12 && tm->tm_mon >= 0) {
307 alrm_en |= S3C2410_RTCALM_MONEN;
308 writeb(bin2bcd(tm->tm_mon + 1), info->base + S3C2410_ALMMON);
309 }
310
311 if (tm->tm_mday <= 31 && tm->tm_mday >= 1) {
312 alrm_en |= S3C2410_RTCALM_DAYEN;
313 writeb(bin2bcd(tm->tm_mday), info->base + S3C2410_ALMDATE);
314 }
315
316 dev_dbg(dev, "setting S3C2410_RTCALM to %08x\n", alrm_en);
317
318 writeb(alrm_en, info->base + S3C2410_RTCALM);
319
320 s3c_rtc_setaie(dev, alrm->enabled);
321
322 s3c_rtc_disable_clk(info);
323
324 return 0;
325}
326
327static const struct rtc_class_ops s3c_rtcops = {
328 .read_time = s3c_rtc_gettime,
329 .set_time = s3c_rtc_settime,
330 .read_alarm = s3c_rtc_getalarm,
331 .set_alarm = s3c_rtc_setalarm,
332 .alarm_irq_enable = s3c_rtc_setaie,
333};
334
335static void s3c24xx_rtc_enable(struct s3c_rtc *info)
336{
337 unsigned int con, tmp;
338
339 con = readw(info->base + S3C2410_RTCCON);
340 /* re-enable the device, and check it is ok */
341 if ((con & S3C2410_RTCCON_RTCEN) == 0) {
342 dev_info(info->dev, "rtc disabled, re-enabling\n");
343
344 tmp = readw(info->base + S3C2410_RTCCON);
345 writew(tmp | S3C2410_RTCCON_RTCEN, info->base + S3C2410_RTCCON);
346 }
347
348 if (con & S3C2410_RTCCON_CNTSEL) {
349 dev_info(info->dev, "removing RTCCON_CNTSEL\n");
350
351 tmp = readw(info->base + S3C2410_RTCCON);
352 writew(tmp & ~S3C2410_RTCCON_CNTSEL,
353 info->base + S3C2410_RTCCON);
354 }
355
356 if (con & S3C2410_RTCCON_CLKRST) {
357 dev_info(info->dev, "removing RTCCON_CLKRST\n");
358
359 tmp = readw(info->base + S3C2410_RTCCON);
360 writew(tmp & ~S3C2410_RTCCON_CLKRST,
361 info->base + S3C2410_RTCCON);
362 }
363}
364
365static void s3c24xx_rtc_disable(struct s3c_rtc *info)
366{
367 unsigned int con;
368
369 con = readw(info->base + S3C2410_RTCCON);
370 con &= ~S3C2410_RTCCON_RTCEN;
371 writew(con, info->base + S3C2410_RTCCON);
372
373 con = readb(info->base + S3C2410_TICNT);
374 con &= ~S3C2410_TICNT_ENABLE;
375 writeb(con, info->base + S3C2410_TICNT);
376}
377
378static void s3c6410_rtc_disable(struct s3c_rtc *info)
379{
380 unsigned int con;
381
382 con = readw(info->base + S3C2410_RTCCON);
383 con &= ~S3C64XX_RTCCON_TICEN;
384 con &= ~S3C2410_RTCCON_RTCEN;
385 writew(con, info->base + S3C2410_RTCCON);
386}
387
388static int s3c_rtc_remove(struct platform_device *pdev)
389{
390 struct s3c_rtc *info = platform_get_drvdata(pdev);
391
392 s3c_rtc_setaie(info->dev, 0);
393
394 if (info->data->needs_src_clk)
395 clk_unprepare(info->rtc_src_clk);
396 clk_unprepare(info->rtc_clk);
397
398 return 0;
399}
400
401static int s3c_rtc_probe(struct platform_device *pdev)
402{
403 struct s3c_rtc *info = NULL;
404 int ret;
405
406 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
407 if (!info)
408 return -ENOMEM;
409
410 info->dev = &pdev->dev;
411 info->data = of_device_get_match_data(&pdev->dev);
412 if (!info->data) {
413 dev_err(&pdev->dev, "failed getting s3c_rtc_data\n");
414 return -EINVAL;
415 }
416 spin_lock_init(&info->alarm_lock);
417
418 platform_set_drvdata(pdev, info);
419
420 info->irq_alarm = platform_get_irq(pdev, 0);
421 if (info->irq_alarm < 0)
422 return info->irq_alarm;
423
424 dev_dbg(&pdev->dev, "s3c2410_rtc: alarm irq %d\n", info->irq_alarm);
425
426 /* get the memory region */
427 info->base = devm_platform_ioremap_resource(pdev, 0);
428 if (IS_ERR(info->base))
429 return PTR_ERR(info->base);
430
431 info->rtc_clk = devm_clk_get(&pdev->dev, "rtc");
432 if (IS_ERR(info->rtc_clk))
433 return dev_err_probe(&pdev->dev, PTR_ERR(info->rtc_clk),
434 "failed to find rtc clock\n");
435 ret = clk_prepare_enable(info->rtc_clk);
436 if (ret)
437 return ret;
438
439 if (info->data->needs_src_clk) {
440 info->rtc_src_clk = devm_clk_get(&pdev->dev, "rtc_src");
441 if (IS_ERR(info->rtc_src_clk)) {
442 ret = dev_err_probe(&pdev->dev, PTR_ERR(info->rtc_src_clk),
443 "failed to find rtc source clock\n");
444 goto err_src_clk;
445 }
446 ret = clk_prepare_enable(info->rtc_src_clk);
447 if (ret)
448 goto err_src_clk;
449 }
450
451 /* disable RTC enable bits potentially set by the bootloader */
452 if (info->data->disable)
453 info->data->disable(info);
454
455 /* check to see if everything is setup correctly */
456 if (info->data->enable)
457 info->data->enable(info);
458
459 dev_dbg(&pdev->dev, "s3c2410_rtc: RTCCON=%02x\n",
460 readw(info->base + S3C2410_RTCCON));
461
462 device_init_wakeup(&pdev->dev, 1);
463
464 info->rtc = devm_rtc_allocate_device(&pdev->dev);
465 if (IS_ERR(info->rtc)) {
466 ret = PTR_ERR(info->rtc);
467 goto err_nortc;
468 }
469
470 info->rtc->ops = &s3c_rtcops;
471 info->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
472 info->rtc->range_max = RTC_TIMESTAMP_END_2099;
473
474 ret = devm_rtc_register_device(info->rtc);
475 if (ret)
476 goto err_nortc;
477
478 ret = devm_request_irq(&pdev->dev, info->irq_alarm, s3c_rtc_alarmirq,
479 0, "s3c2410-rtc alarm", info);
480 if (ret) {
481 dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_alarm, ret);
482 goto err_nortc;
483 }
484
485 s3c_rtc_disable_clk(info);
486
487 return 0;
488
489err_nortc:
490 if (info->data->disable)
491 info->data->disable(info);
492
493 if (info->data->needs_src_clk)
494 clk_disable_unprepare(info->rtc_src_clk);
495err_src_clk:
496 clk_disable_unprepare(info->rtc_clk);
497
498 return ret;
499}
500
501#ifdef CONFIG_PM_SLEEP
502
503static int s3c_rtc_suspend(struct device *dev)
504{
505 struct s3c_rtc *info = dev_get_drvdata(dev);
506 int ret;
507
508 ret = s3c_rtc_enable_clk(info);
509 if (ret)
510 return ret;
511
512 if (info->data->disable)
513 info->data->disable(info);
514
515 if (device_may_wakeup(dev) && !info->wake_en) {
516 if (enable_irq_wake(info->irq_alarm) == 0)
517 info->wake_en = true;
518 else
519 dev_err(dev, "enable_irq_wake failed\n");
520 }
521
522 return 0;
523}
524
525static int s3c_rtc_resume(struct device *dev)
526{
527 struct s3c_rtc *info = dev_get_drvdata(dev);
528
529 if (info->data->enable)
530 info->data->enable(info);
531
532 s3c_rtc_disable_clk(info);
533
534 if (device_may_wakeup(dev) && info->wake_en) {
535 disable_irq_wake(info->irq_alarm);
536 info->wake_en = false;
537 }
538
539 return 0;
540}
541#endif
542static SIMPLE_DEV_PM_OPS(s3c_rtc_pm_ops, s3c_rtc_suspend, s3c_rtc_resume);
543
544static void s3c24xx_rtc_irq(struct s3c_rtc *info, int mask)
545{
546 rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF);
547}
548
549static void s3c6410_rtc_irq(struct s3c_rtc *info, int mask)
550{
551 rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF);
552 writeb(mask, info->base + S3C2410_INTP);
553}
554
555static struct s3c_rtc_data const s3c2410_rtc_data = {
556 .irq_handler = s3c24xx_rtc_irq,
557 .enable = s3c24xx_rtc_enable,
558 .disable = s3c24xx_rtc_disable,
559};
560
561static struct s3c_rtc_data const s3c2416_rtc_data = {
562 .irq_handler = s3c24xx_rtc_irq,
563 .enable = s3c24xx_rtc_enable,
564 .disable = s3c24xx_rtc_disable,
565};
566
567static struct s3c_rtc_data const s3c2443_rtc_data = {
568 .irq_handler = s3c24xx_rtc_irq,
569 .enable = s3c24xx_rtc_enable,
570 .disable = s3c24xx_rtc_disable,
571};
572
573static struct s3c_rtc_data const s3c6410_rtc_data = {
574 .needs_src_clk = true,
575 .irq_handler = s3c6410_rtc_irq,
576 .enable = s3c24xx_rtc_enable,
577 .disable = s3c6410_rtc_disable,
578};
579
580static const __maybe_unused struct of_device_id s3c_rtc_dt_match[] = {
581 {
582 .compatible = "samsung,s3c2410-rtc",
583 .data = &s3c2410_rtc_data,
584 }, {
585 .compatible = "samsung,s3c2416-rtc",
586 .data = &s3c2416_rtc_data,
587 }, {
588 .compatible = "samsung,s3c2443-rtc",
589 .data = &s3c2443_rtc_data,
590 }, {
591 .compatible = "samsung,s3c6410-rtc",
592 .data = &s3c6410_rtc_data,
593 }, {
594 .compatible = "samsung,exynos3250-rtc",
595 .data = &s3c6410_rtc_data,
596 },
597 { /* sentinel */ },
598};
599MODULE_DEVICE_TABLE(of, s3c_rtc_dt_match);
600
601static struct platform_driver s3c_rtc_driver = {
602 .probe = s3c_rtc_probe,
603 .remove = s3c_rtc_remove,
604 .driver = {
605 .name = "s3c-rtc",
606 .pm = &s3c_rtc_pm_ops,
607 .of_match_table = of_match_ptr(s3c_rtc_dt_match),
608 },
609};
610module_platform_driver(s3c_rtc_driver);
611
612MODULE_DESCRIPTION("Samsung S3C RTC Driver");
613MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
614MODULE_LICENSE("GPL");
615MODULE_ALIAS("platform:s3c2410-rtc");