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1// SPDX-License-Identifier: GPL-2.0-only
2/* drivers/rtc/rtc-s3c.c
3 *
4 * Copyright (c) 2010 Samsung Electronics Co., Ltd.
5 * http://www.samsung.com/
6 *
7 * Copyright (c) 2004,2006 Simtec Electronics
8 * Ben Dooks, <ben@simtec.co.uk>
9 * http://armlinux.simtec.co.uk/
10 *
11 * S3C2410/S3C2440/S3C24XX Internal RTC Driver
12*/
13
14#include <linux/module.h>
15#include <linux/fs.h>
16#include <linux/string.h>
17#include <linux/init.h>
18#include <linux/platform_device.h>
19#include <linux/interrupt.h>
20#include <linux/rtc.h>
21#include <linux/bcd.h>
22#include <linux/clk.h>
23#include <linux/log2.h>
24#include <linux/slab.h>
25#include <linux/of.h>
26#include <linux/of_device.h>
27#include <linux/uaccess.h>
28#include <linux/io.h>
29
30#include <asm/irq.h>
31#include "rtc-s3c.h"
32
33struct s3c_rtc {
34 struct device *dev;
35 struct rtc_device *rtc;
36
37 void __iomem *base;
38 struct clk *rtc_clk;
39 struct clk *rtc_src_clk;
40 bool alarm_enabled;
41
42 const struct s3c_rtc_data *data;
43
44 int irq_alarm;
45 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");
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 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, ticnt_en_save;
53 bool wake_en;
54};
55
56struct s3c_rtc_data {
57 int max_user_freq;
58 bool needs_src_clk;
59
60 void (*irq_handler) (struct s3c_rtc *info, int mask);
61 void (*set_freq) (struct s3c_rtc *info, int freq);
62 void (*enable_tick) (struct s3c_rtc *info, struct seq_file *seq);
63 void (*select_tick_clk) (struct s3c_rtc *info);
64 void (*save_tick_cnt) (struct s3c_rtc *info);
65 void (*restore_tick_cnt) (struct s3c_rtc *info);
66 void (*enable) (struct s3c_rtc *info);
67 void (*disable) (struct s3c_rtc *info);
68};
69
70static void s3c_rtc_enable_clk(struct s3c_rtc *info)
71{
72 unsigned long irq_flags;
73
74 spin_lock_irqsave(&info->alarm_clk_lock, irq_flags);
75 if (info->clk_disabled) {
76 clk_enable(info->rtc_clk);
77 if (info->data->needs_src_clk)
78 clk_enable(info->rtc_src_clk);
79 info->clk_disabled = false;
80 }
81 spin_unlock_irqrestore(&info->alarm_clk_lock, irq_flags);
82}
83
84static void s3c_rtc_disable_clk(struct s3c_rtc *info)
85{
86 unsigned long irq_flags;
87
88 spin_lock_irqsave(&info->alarm_clk_lock, irq_flags);
89 if (!info->clk_disabled) {
90 if (info->data->needs_src_clk)
91 clk_disable(info->rtc_src_clk);
92 clk_disable(info->rtc_clk);
93 info->clk_disabled = true;
94 }
95 spin_unlock_irqrestore(&info->alarm_clk_lock, irq_flags);
96}
97
98/* IRQ Handlers */
99static irqreturn_t s3c_rtc_tickirq(int irq, void *id)
100{
101 struct s3c_rtc *info = (struct s3c_rtc *)id;
102
103 if (info->data->irq_handler)
104 info->data->irq_handler(info, S3C2410_INTP_TIC);
105
106 return IRQ_HANDLED;
107}
108
109static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)
110{
111 struct s3c_rtc *info = (struct s3c_rtc *)id;
112
113 if (info->data->irq_handler)
114 info->data->irq_handler(info, S3C2410_INTP_ALM);
115
116 return IRQ_HANDLED;
117}
118
119/* Update control registers */
120static int s3c_rtc_setaie(struct device *dev, unsigned int enabled)
121{
122 struct s3c_rtc *info = dev_get_drvdata(dev);
123 unsigned int tmp;
124
125 dev_dbg(info->dev, "%s: aie=%d\n", __func__, enabled);
126
127 s3c_rtc_enable_clk(info);
128
129 tmp = readb(info->base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
130
131 if (enabled)
132 tmp |= S3C2410_RTCALM_ALMEN;
133
134 writeb(tmp, info->base + S3C2410_RTCALM);
135
136 s3c_rtc_disable_clk(info);
137
138 if (enabled)
139 s3c_rtc_enable_clk(info);
140 else
141 s3c_rtc_disable_clk(info);
142
143 return 0;
144}
145
146/* Set RTC frequency */
147static int s3c_rtc_setfreq(struct s3c_rtc *info, int freq)
148{
149 if (!is_power_of_2(freq))
150 return -EINVAL;
151
152 s3c_rtc_enable_clk(info);
153 spin_lock_irq(&info->pie_lock);
154
155 if (info->data->set_freq)
156 info->data->set_freq(info, freq);
157
158 spin_unlock_irq(&info->pie_lock);
159 s3c_rtc_disable_clk(info);
160
161 return 0;
162}
163
164/* Time read/write */
165static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
166{
167 struct s3c_rtc *info = dev_get_drvdata(dev);
168 unsigned int have_retried = 0;
169
170 s3c_rtc_enable_clk(info);
171
172 retry_get_time:
173 rtc_tm->tm_min = readb(info->base + S3C2410_RTCMIN);
174 rtc_tm->tm_hour = readb(info->base + S3C2410_RTCHOUR);
175 rtc_tm->tm_mday = readb(info->base + S3C2410_RTCDATE);
176 rtc_tm->tm_mon = readb(info->base + S3C2410_RTCMON);
177 rtc_tm->tm_year = readb(info->base + S3C2410_RTCYEAR);
178 rtc_tm->tm_sec = readb(info->base + S3C2410_RTCSEC);
179
180 /* the only way to work out whether the system was mid-update
181 * when we read it is to check the second counter, and if it
182 * is zero, then we re-try the entire read
183 */
184
185 if (rtc_tm->tm_sec == 0 && !have_retried) {
186 have_retried = 1;
187 goto retry_get_time;
188 }
189
190 rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
191 rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
192 rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
193 rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
194 rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
195 rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);
196
197 s3c_rtc_disable_clk(info);
198
199 rtc_tm->tm_year += 100;
200
201 dev_dbg(dev, "read time %04d.%02d.%02d %02d:%02d:%02d\n",
202 1900 + rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday,
203 rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);
204
205 rtc_tm->tm_mon -= 1;
206
207 return rtc_valid_tm(rtc_tm);
208}
209
210static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
211{
212 struct s3c_rtc *info = dev_get_drvdata(dev);
213 int year = tm->tm_year - 100;
214
215 dev_dbg(dev, "set time %04d.%02d.%02d %02d:%02d:%02d\n",
216 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
217 tm->tm_hour, tm->tm_min, tm->tm_sec);
218
219 /* we get around y2k by simply not supporting it */
220
221 if (year < 0 || year >= 100) {
222 dev_err(dev, "rtc only supports 100 years\n");
223 return -EINVAL;
224 }
225
226 s3c_rtc_enable_clk(info);
227
228 writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_RTCSEC);
229 writeb(bin2bcd(tm->tm_min), info->base + S3C2410_RTCMIN);
230 writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_RTCHOUR);
231 writeb(bin2bcd(tm->tm_mday), info->base + S3C2410_RTCDATE);
232 writeb(bin2bcd(tm->tm_mon + 1), info->base + S3C2410_RTCMON);
233 writeb(bin2bcd(year), info->base + S3C2410_RTCYEAR);
234
235 s3c_rtc_disable_clk(info);
236
237 return 0;
238}
239
240static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
241{
242 struct s3c_rtc *info = dev_get_drvdata(dev);
243 struct rtc_time *alm_tm = &alrm->time;
244 unsigned int alm_en;
245
246 s3c_rtc_enable_clk(info);
247
248 alm_tm->tm_sec = readb(info->base + S3C2410_ALMSEC);
249 alm_tm->tm_min = readb(info->base + S3C2410_ALMMIN);
250 alm_tm->tm_hour = readb(info->base + S3C2410_ALMHOUR);
251 alm_tm->tm_mon = readb(info->base + S3C2410_ALMMON);
252 alm_tm->tm_mday = readb(info->base + S3C2410_ALMDATE);
253 alm_tm->tm_year = readb(info->base + S3C2410_ALMYEAR);
254
255 alm_en = readb(info->base + S3C2410_RTCALM);
256
257 s3c_rtc_disable_clk(info);
258
259 alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0;
260
261 dev_dbg(dev, "read alarm %d, %04d.%02d.%02d %02d:%02d:%02d\n",
262 alm_en,
263 1900 + alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday,
264 alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec);
265
266 /* decode the alarm enable field */
267 if (alm_en & S3C2410_RTCALM_SECEN)
268 alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec);
269
270 if (alm_en & S3C2410_RTCALM_MINEN)
271 alm_tm->tm_min = bcd2bin(alm_tm->tm_min);
272
273 if (alm_en & S3C2410_RTCALM_HOUREN)
274 alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour);
275
276 if (alm_en & S3C2410_RTCALM_DAYEN)
277 alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday);
278
279 if (alm_en & S3C2410_RTCALM_MONEN) {
280 alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon);
281 alm_tm->tm_mon -= 1;
282 }
283
284 if (alm_en & S3C2410_RTCALM_YEAREN)
285 alm_tm->tm_year = bcd2bin(alm_tm->tm_year);
286
287 return 0;
288}
289
290static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
291{
292 struct s3c_rtc *info = dev_get_drvdata(dev);
293 struct rtc_time *tm = &alrm->time;
294 unsigned int alrm_en;
295 int year = tm->tm_year - 100;
296
297 dev_dbg(dev, "s3c_rtc_setalarm: %d, %04d.%02d.%02d %02d:%02d:%02d\n",
298 alrm->enabled,
299 1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday,
300 tm->tm_hour, tm->tm_min, tm->tm_sec);
301
302 s3c_rtc_enable_clk(info);
303
304 alrm_en = readb(info->base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
305 writeb(0x00, info->base + S3C2410_RTCALM);
306
307 if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
308 alrm_en |= S3C2410_RTCALM_SECEN;
309 writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_ALMSEC);
310 }
311
312 if (tm->tm_min < 60 && tm->tm_min >= 0) {
313 alrm_en |= S3C2410_RTCALM_MINEN;
314 writeb(bin2bcd(tm->tm_min), info->base + S3C2410_ALMMIN);
315 }
316
317 if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
318 alrm_en |= S3C2410_RTCALM_HOUREN;
319 writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_ALMHOUR);
320 }
321
322 if (year < 100 && year >= 0) {
323 alrm_en |= S3C2410_RTCALM_YEAREN;
324 writeb(bin2bcd(year), info->base + S3C2410_ALMYEAR);
325 }
326
327 if (tm->tm_mon < 12 && tm->tm_mon >= 0) {
328 alrm_en |= S3C2410_RTCALM_MONEN;
329 writeb(bin2bcd(tm->tm_mon + 1), info->base + S3C2410_ALMMON);
330 }
331
332 if (tm->tm_mday <= 31 && tm->tm_mday >= 1) {
333 alrm_en |= S3C2410_RTCALM_DAYEN;
334 writeb(bin2bcd(tm->tm_mday), info->base + S3C2410_ALMDATE);
335 }
336
337 dev_dbg(dev, "setting S3C2410_RTCALM to %08x\n", alrm_en);
338
339 writeb(alrm_en, info->base + S3C2410_RTCALM);
340
341 s3c_rtc_disable_clk(info);
342
343 s3c_rtc_setaie(dev, alrm->enabled);
344
345 return 0;
346}
347
348static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
349{
350 struct s3c_rtc *info = dev_get_drvdata(dev);
351
352 s3c_rtc_enable_clk(info);
353
354 if (info->data->enable_tick)
355 info->data->enable_tick(info, seq);
356
357 s3c_rtc_disable_clk(info);
358
359 return 0;
360}
361
362static const struct rtc_class_ops s3c_rtcops = {
363 .read_time = s3c_rtc_gettime,
364 .set_time = s3c_rtc_settime,
365 .read_alarm = s3c_rtc_getalarm,
366 .set_alarm = s3c_rtc_setalarm,
367 .proc = s3c_rtc_proc,
368 .alarm_irq_enable = s3c_rtc_setaie,
369};
370
371static void s3c24xx_rtc_enable(struct s3c_rtc *info)
372{
373 unsigned int con, tmp;
374
375 con = readw(info->base + S3C2410_RTCCON);
376 /* re-enable the device, and check it is ok */
377 if ((con & S3C2410_RTCCON_RTCEN) == 0) {
378 dev_info(info->dev, "rtc disabled, re-enabling\n");
379
380 tmp = readw(info->base + S3C2410_RTCCON);
381 writew(tmp | S3C2410_RTCCON_RTCEN,
382 info->base + S3C2410_RTCCON);
383 }
384
385 if (con & S3C2410_RTCCON_CNTSEL) {
386 dev_info(info->dev, "removing RTCCON_CNTSEL\n");
387
388 tmp = readw(info->base + S3C2410_RTCCON);
389 writew(tmp & ~S3C2410_RTCCON_CNTSEL,
390 info->base + S3C2410_RTCCON);
391 }
392
393 if (con & S3C2410_RTCCON_CLKRST) {
394 dev_info(info->dev, "removing RTCCON_CLKRST\n");
395
396 tmp = readw(info->base + S3C2410_RTCCON);
397 writew(tmp & ~S3C2410_RTCCON_CLKRST,
398 info->base + S3C2410_RTCCON);
399 }
400}
401
402static void s3c24xx_rtc_disable(struct s3c_rtc *info)
403{
404 unsigned int con;
405
406 con = readw(info->base + S3C2410_RTCCON);
407 con &= ~S3C2410_RTCCON_RTCEN;
408 writew(con, info->base + S3C2410_RTCCON);
409
410 con = readb(info->base + S3C2410_TICNT);
411 con &= ~S3C2410_TICNT_ENABLE;
412 writeb(con, info->base + S3C2410_TICNT);
413}
414
415static void s3c6410_rtc_disable(struct s3c_rtc *info)
416{
417 unsigned int con;
418
419 con = readw(info->base + S3C2410_RTCCON);
420 con &= ~S3C64XX_RTCCON_TICEN;
421 con &= ~S3C2410_RTCCON_RTCEN;
422 writew(con, info->base + S3C2410_RTCCON);
423}
424
425static int s3c_rtc_remove(struct platform_device *pdev)
426{
427 struct s3c_rtc *info = platform_get_drvdata(pdev);
428
429 s3c_rtc_setaie(info->dev, 0);
430
431 if (info->data->needs_src_clk)
432 clk_unprepare(info->rtc_src_clk);
433 clk_unprepare(info->rtc_clk);
434
435 return 0;
436}
437
438static const struct of_device_id s3c_rtc_dt_match[];
439
440static struct s3c_rtc_data *s3c_rtc_get_data(struct platform_device *pdev)
441{
442 const struct of_device_id *match;
443
444 match = of_match_node(s3c_rtc_dt_match, pdev->dev.of_node);
445 return (struct s3c_rtc_data *)match->data;
446}
447
448static int s3c_rtc_probe(struct platform_device *pdev)
449{
450 struct s3c_rtc *info = NULL;
451 struct rtc_time rtc_tm;
452 struct resource *res;
453 int ret;
454
455 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
456 if (!info)
457 return -ENOMEM;
458
459 /* find the IRQs */
460 info->irq_tick = platform_get_irq(pdev, 1);
461 if (info->irq_tick < 0) {
462 dev_err(&pdev->dev, "no irq for rtc tick\n");
463 return info->irq_tick;
464 }
465
466 info->dev = &pdev->dev;
467 info->data = s3c_rtc_get_data(pdev);
468 if (!info->data) {
469 dev_err(&pdev->dev, "failed getting s3c_rtc_data\n");
470 return -EINVAL;
471 }
472 spin_lock_init(&info->pie_lock);
473 spin_lock_init(&info->alarm_clk_lock);
474
475 platform_set_drvdata(pdev, info);
476
477 info->irq_alarm = platform_get_irq(pdev, 0);
478 if (info->irq_alarm < 0) {
479 dev_err(&pdev->dev, "no irq for alarm\n");
480 return info->irq_alarm;
481 }
482
483 dev_dbg(&pdev->dev, "s3c2410_rtc: tick irq %d, alarm irq %d\n",
484 info->irq_tick, info->irq_alarm);
485
486 /* get the memory region */
487 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
488 info->base = devm_ioremap_resource(&pdev->dev, res);
489 if (IS_ERR(info->base))
490 return PTR_ERR(info->base);
491
492 info->rtc_clk = devm_clk_get(&pdev->dev, "rtc");
493 if (IS_ERR(info->rtc_clk)) {
494 ret = PTR_ERR(info->rtc_clk);
495 if (ret != -EPROBE_DEFER)
496 dev_err(&pdev->dev, "failed to find rtc clock\n");
497 else
498 dev_dbg(&pdev->dev, "probe deferred due to missing rtc clk\n");
499 return ret;
500 }
501 clk_prepare_enable(info->rtc_clk);
502
503 if (info->data->needs_src_clk) {
504 info->rtc_src_clk = devm_clk_get(&pdev->dev, "rtc_src");
505 if (IS_ERR(info->rtc_src_clk)) {
506 ret = PTR_ERR(info->rtc_src_clk);
507 if (ret != -EPROBE_DEFER)
508 dev_err(&pdev->dev,
509 "failed to find rtc source clock\n");
510 else
511 dev_dbg(&pdev->dev,
512 "probe deferred due to missing rtc src clk\n");
513 clk_disable_unprepare(info->rtc_clk);
514 return ret;
515 }
516 clk_prepare_enable(info->rtc_src_clk);
517 }
518
519 /* check to see if everything is setup correctly */
520 if (info->data->enable)
521 info->data->enable(info);
522
523 dev_dbg(&pdev->dev, "s3c2410_rtc: RTCCON=%02x\n",
524 readw(info->base + S3C2410_RTCCON));
525
526 device_init_wakeup(&pdev->dev, 1);
527
528 /* Check RTC Time */
529 if (s3c_rtc_gettime(&pdev->dev, &rtc_tm)) {
530 rtc_tm.tm_year = 100;
531 rtc_tm.tm_mon = 0;
532 rtc_tm.tm_mday = 1;
533 rtc_tm.tm_hour = 0;
534 rtc_tm.tm_min = 0;
535 rtc_tm.tm_sec = 0;
536
537 s3c_rtc_settime(&pdev->dev, &rtc_tm);
538
539 dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n");
540 }
541
542 /* register RTC and exit */
543 info->rtc = devm_rtc_device_register(&pdev->dev, "s3c", &s3c_rtcops,
544 THIS_MODULE);
545 if (IS_ERR(info->rtc)) {
546 dev_err(&pdev->dev, "cannot attach rtc\n");
547 ret = PTR_ERR(info->rtc);
548 goto err_nortc;
549 }
550
551 ret = devm_request_irq(&pdev->dev, info->irq_alarm, s3c_rtc_alarmirq,
552 0, "s3c2410-rtc alarm", info);
553 if (ret) {
554 dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_alarm, ret);
555 goto err_nortc;
556 }
557
558 ret = devm_request_irq(&pdev->dev, info->irq_tick, s3c_rtc_tickirq,
559 0, "s3c2410-rtc tick", info);
560 if (ret) {
561 dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_tick, ret);
562 goto err_nortc;
563 }
564
565 if (info->data->select_tick_clk)
566 info->data->select_tick_clk(info);
567
568 s3c_rtc_setfreq(info, 1);
569
570 return 0;
571
572 err_nortc:
573 if (info->data->disable)
574 info->data->disable(info);
575
576 if (info->data->needs_src_clk)
577 clk_disable_unprepare(info->rtc_src_clk);
578 clk_disable_unprepare(info->rtc_clk);
579
580 return ret;
581}
582
583#ifdef CONFIG_PM_SLEEP
584
585static int s3c_rtc_suspend(struct device *dev)
586{
587 struct s3c_rtc *info = dev_get_drvdata(dev);
588
589 s3c_rtc_enable_clk(info);
590
591 /* save TICNT for anyone using periodic interrupts */
592 if (info->data->save_tick_cnt)
593 info->data->save_tick_cnt(info);
594
595 if (info->data->disable)
596 info->data->disable(info);
597
598 if (device_may_wakeup(dev) && !info->wake_en) {
599 if (enable_irq_wake(info->irq_alarm) == 0)
600 info->wake_en = true;
601 else
602 dev_err(dev, "enable_irq_wake failed\n");
603 }
604
605 return 0;
606}
607
608static int s3c_rtc_resume(struct device *dev)
609{
610 struct s3c_rtc *info = dev_get_drvdata(dev);
611
612 if (info->data->enable)
613 info->data->enable(info);
614
615 if (info->data->restore_tick_cnt)
616 info->data->restore_tick_cnt(info);
617
618 s3c_rtc_disable_clk(info);
619
620 if (device_may_wakeup(dev) && info->wake_en) {
621 disable_irq_wake(info->irq_alarm);
622 info->wake_en = false;
623 }
624
625 return 0;
626}
627#endif
628static SIMPLE_DEV_PM_OPS(s3c_rtc_pm_ops, s3c_rtc_suspend, s3c_rtc_resume);
629
630static void s3c24xx_rtc_irq(struct s3c_rtc *info, int mask)
631{
632 rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF);
633}
634
635static void s3c6410_rtc_irq(struct s3c_rtc *info, int mask)
636{
637 rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF);
638 writeb(mask, info->base + S3C2410_INTP);
639}
640
641static void s3c2410_rtc_setfreq(struct s3c_rtc *info, int freq)
642{
643 unsigned int tmp = 0;
644 int val;
645
646 tmp = readb(info->base + S3C2410_TICNT);
647 tmp &= S3C2410_TICNT_ENABLE;
648
649 val = (info->rtc->max_user_freq / freq) - 1;
650 tmp |= val;
651
652 writel(tmp, info->base + S3C2410_TICNT);
653}
654
655static void s3c2416_rtc_setfreq(struct s3c_rtc *info, int freq)
656{
657 unsigned int tmp = 0;
658 int val;
659
660 tmp = readb(info->base + S3C2410_TICNT);
661 tmp &= S3C2410_TICNT_ENABLE;
662
663 val = (info->rtc->max_user_freq / freq) - 1;
664
665 tmp |= S3C2443_TICNT_PART(val);
666 writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1);
667
668 writel(S3C2416_TICNT2_PART(val), info->base + S3C2416_TICNT2);
669
670 writel(tmp, info->base + S3C2410_TICNT);
671}
672
673static void s3c2443_rtc_setfreq(struct s3c_rtc *info, int freq)
674{
675 unsigned int tmp = 0;
676 int val;
677
678 tmp = readb(info->base + S3C2410_TICNT);
679 tmp &= S3C2410_TICNT_ENABLE;
680
681 val = (info->rtc->max_user_freq / freq) - 1;
682
683 tmp |= S3C2443_TICNT_PART(val);
684 writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1);
685
686 writel(tmp, info->base + S3C2410_TICNT);
687}
688
689static void s3c6410_rtc_setfreq(struct s3c_rtc *info, int freq)
690{
691 int val;
692
693 val = (info->rtc->max_user_freq / freq) - 1;
694 writel(val, info->base + S3C2410_TICNT);
695}
696
697static void s3c24xx_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq)
698{
699 unsigned int ticnt;
700
701 ticnt = readb(info->base + S3C2410_TICNT);
702 ticnt &= S3C2410_TICNT_ENABLE;
703
704 seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no");
705}
706
707static void s3c2416_rtc_select_tick_clk(struct s3c_rtc *info)
708{
709 unsigned int con;
710
711 con = readw(info->base + S3C2410_RTCCON);
712 con |= S3C2443_RTCCON_TICSEL;
713 writew(con, info->base + S3C2410_RTCCON);
714}
715
716static void s3c6410_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq)
717{
718 unsigned int ticnt;
719
720 ticnt = readw(info->base + S3C2410_RTCCON);
721 ticnt &= S3C64XX_RTCCON_TICEN;
722
723 seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no");
724}
725
726static void s3c24xx_rtc_save_tick_cnt(struct s3c_rtc *info)
727{
728 info->ticnt_save = readb(info->base + S3C2410_TICNT);
729}
730
731static void s3c24xx_rtc_restore_tick_cnt(struct s3c_rtc *info)
732{
733 writeb(info->ticnt_save, info->base + S3C2410_TICNT);
734}
735
736static void s3c6410_rtc_save_tick_cnt(struct s3c_rtc *info)
737{
738 info->ticnt_en_save = readw(info->base + S3C2410_RTCCON);
739 info->ticnt_en_save &= S3C64XX_RTCCON_TICEN;
740 info->ticnt_save = readl(info->base + S3C2410_TICNT);
741}
742
743static void s3c6410_rtc_restore_tick_cnt(struct s3c_rtc *info)
744{
745 unsigned int con;
746
747 writel(info->ticnt_save, info->base + S3C2410_TICNT);
748 if (info->ticnt_en_save) {
749 con = readw(info->base + S3C2410_RTCCON);
750 writew(con | info->ticnt_en_save,
751 info->base + S3C2410_RTCCON);
752 }
753}
754
755static struct s3c_rtc_data const s3c2410_rtc_data = {
756 .max_user_freq = 128,
757 .irq_handler = s3c24xx_rtc_irq,
758 .set_freq = s3c2410_rtc_setfreq,
759 .enable_tick = s3c24xx_rtc_enable_tick,
760 .save_tick_cnt = s3c24xx_rtc_save_tick_cnt,
761 .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt,
762 .enable = s3c24xx_rtc_enable,
763 .disable = s3c24xx_rtc_disable,
764};
765
766static struct s3c_rtc_data const s3c2416_rtc_data = {
767 .max_user_freq = 32768,
768 .irq_handler = s3c24xx_rtc_irq,
769 .set_freq = s3c2416_rtc_setfreq,
770 .enable_tick = s3c24xx_rtc_enable_tick,
771 .select_tick_clk = s3c2416_rtc_select_tick_clk,
772 .save_tick_cnt = s3c24xx_rtc_save_tick_cnt,
773 .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt,
774 .enable = s3c24xx_rtc_enable,
775 .disable = s3c24xx_rtc_disable,
776};
777
778static struct s3c_rtc_data const s3c2443_rtc_data = {
779 .max_user_freq = 32768,
780 .irq_handler = s3c24xx_rtc_irq,
781 .set_freq = s3c2443_rtc_setfreq,
782 .enable_tick = s3c24xx_rtc_enable_tick,
783 .select_tick_clk = s3c2416_rtc_select_tick_clk,
784 .save_tick_cnt = s3c24xx_rtc_save_tick_cnt,
785 .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt,
786 .enable = s3c24xx_rtc_enable,
787 .disable = s3c24xx_rtc_disable,
788};
789
790static struct s3c_rtc_data const s3c6410_rtc_data = {
791 .max_user_freq = 32768,
792 .needs_src_clk = true,
793 .irq_handler = s3c6410_rtc_irq,
794 .set_freq = s3c6410_rtc_setfreq,
795 .enable_tick = s3c6410_rtc_enable_tick,
796 .save_tick_cnt = s3c6410_rtc_save_tick_cnt,
797 .restore_tick_cnt = s3c6410_rtc_restore_tick_cnt,
798 .enable = s3c24xx_rtc_enable,
799 .disable = s3c6410_rtc_disable,
800};
801
802static const struct of_device_id s3c_rtc_dt_match[] = {
803 {
804 .compatible = "samsung,s3c2410-rtc",
805 .data = (void *)&s3c2410_rtc_data,
806 }, {
807 .compatible = "samsung,s3c2416-rtc",
808 .data = (void *)&s3c2416_rtc_data,
809 }, {
810 .compatible = "samsung,s3c2443-rtc",
811 .data = (void *)&s3c2443_rtc_data,
812 }, {
813 .compatible = "samsung,s3c6410-rtc",
814 .data = (void *)&s3c6410_rtc_data,
815 }, {
816 .compatible = "samsung,exynos3250-rtc",
817 .data = (void *)&s3c6410_rtc_data,
818 },
819 { /* sentinel */ },
820};
821MODULE_DEVICE_TABLE(of, s3c_rtc_dt_match);
822
823static struct platform_driver s3c_rtc_driver = {
824 .probe = s3c_rtc_probe,
825 .remove = s3c_rtc_remove,
826 .driver = {
827 .name = "s3c-rtc",
828 .pm = &s3c_rtc_pm_ops,
829 .of_match_table = of_match_ptr(s3c_rtc_dt_match),
830 },
831};
832module_platform_driver(s3c_rtc_driver);
833
834MODULE_DESCRIPTION("Samsung S3C RTC Driver");
835MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
836MODULE_LICENSE("GPL");
837MODULE_ALIAS("platform:s3c2410-rtc");