Loading...
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/* 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");