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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_new = 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/* 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");