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Merge tag 'for-linus-20190706' of git://git.kernel.dk/linux-block
[linux/fpc-iii.git] / drivers / rtc / rtc-s3c.c
blob74bf6473a05d3eec357e429f6e06d88e96cdac24
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
33 struct 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 int irq_tick;
46
47 spinlock_t pie_lock;
48 spinlock_t alarm_lock;
49
50 int ticnt_save;
51 int ticnt_en_save;
52 bool wake_en;
53 };
54
55 struct s3c_rtc_data {
56 int max_user_freq;
57 bool needs_src_clk;
58
59 void (*irq_handler) (struct s3c_rtc *info, int mask);
60 void (*set_freq) (struct s3c_rtc *info, int freq);
61 void (*enable_tick) (struct s3c_rtc *info, struct seq_file *seq);
62 void (*select_tick_clk) (struct s3c_rtc *info);
63 void (*save_tick_cnt) (struct s3c_rtc *info);
64 void (*restore_tick_cnt) (struct s3c_rtc *info);
65 void (*enable) (struct s3c_rtc *info);
66 void (*disable) (struct s3c_rtc *info);
67 };
68
69 static int s3c_rtc_enable_clk(struct s3c_rtc *info)
70 {
71 int ret;
72
73 ret = clk_enable(info->rtc_clk);
74 if (ret)
75 return ret;
76
77 if (info->data->needs_src_clk) {
78 ret = clk_enable(info->rtc_src_clk);
79 if (ret) {
80 clk_disable(info->rtc_clk);
81 return ret;
82 }
83 }
84 return 0;
85 }
86
87 static void s3c_rtc_disable_clk(struct s3c_rtc *info)
88 {
89 if (info->data->needs_src_clk)
90 clk_disable(info->rtc_src_clk);
91 clk_disable(info->rtc_clk);
92 }
93
94 /* IRQ Handlers */
95 static irqreturn_t s3c_rtc_tickirq(int irq, void *id)
96 {
97 struct s3c_rtc *info = (struct s3c_rtc *)id;
98
99 if (info->data->irq_handler)
100 info->data->irq_handler(info, S3C2410_INTP_TIC);
101
102 return IRQ_HANDLED;
103 }
104
105 static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)
106 {
107 struct s3c_rtc *info = (struct s3c_rtc *)id;
108
109 if (info->data->irq_handler)
110 info->data->irq_handler(info, S3C2410_INTP_ALM);
111
112 return IRQ_HANDLED;
113 }
114
115 /* Update control registers */
116 static int s3c_rtc_setaie(struct device *dev, unsigned int enabled)
117 {
118 struct s3c_rtc *info = dev_get_drvdata(dev);
119 unsigned long flags;
120 unsigned int tmp;
121 int ret;
122
123 dev_dbg(info->dev, "%s: aie=%d\n", __func__, enabled);
124
125 ret = s3c_rtc_enable_clk(info);
126 if (ret)
127 return ret;
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 spin_lock_irqsave(&info->alarm_lock, flags);
137
138 if (info->alarm_enabled && !enabled)
139 s3c_rtc_disable_clk(info);
140 else if (!info->alarm_enabled && enabled)
141 ret = s3c_rtc_enable_clk(info);
142
143 info->alarm_enabled = enabled;
144 spin_unlock_irqrestore(&info->alarm_lock, flags);
145
146 s3c_rtc_disable_clk(info);
147
148 return ret;
149 }
150
151 /* Set RTC frequency */
152 static int s3c_rtc_setfreq(struct s3c_rtc *info, int freq)
153 {
154 int ret;
155
156 if (!is_power_of_2(freq))
157 return -EINVAL;
158
159 ret = s3c_rtc_enable_clk(info);
160 if (ret)
161 return ret;
162 spin_lock_irq(&info->pie_lock);
163
164 if (info->data->set_freq)
165 info->data->set_freq(info, freq);
166
167 spin_unlock_irq(&info->pie_lock);
168 s3c_rtc_disable_clk(info);
169
170 return 0;
171 }
172
173 /* Time read/write */
174 static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
175 {
176 struct s3c_rtc *info = dev_get_drvdata(dev);
177 unsigned int have_retried = 0;
178 int ret;
179
180 ret = s3c_rtc_enable_clk(info);
181 if (ret)
182 return ret;
183
184 retry_get_time:
185 rtc_tm->tm_min = readb(info->base + S3C2410_RTCMIN);
186 rtc_tm->tm_hour = readb(info->base + S3C2410_RTCHOUR);
187 rtc_tm->tm_mday = readb(info->base + S3C2410_RTCDATE);
188 rtc_tm->tm_mon = readb(info->base + S3C2410_RTCMON);
189 rtc_tm->tm_year = readb(info->base + S3C2410_RTCYEAR);
190 rtc_tm->tm_sec = readb(info->base + S3C2410_RTCSEC);
191
192 /* the only way to work out whether the system was mid-update
193 * when we read it is to check the second counter, and if it
194 * is zero, then we re-try the entire read
195 */
196
197 if (rtc_tm->tm_sec == 0 && !have_retried) {
198 have_retried = 1;
199 goto retry_get_time;
200 }
201
202 rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
203 rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
204 rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
205 rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
206 rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
207 rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);
208
209 s3c_rtc_disable_clk(info);
210
211 rtc_tm->tm_year += 100;
212 rtc_tm->tm_mon -= 1;
213
214 dev_dbg(dev, "read time %ptR\n", rtc_tm);
215 return 0;
216 }
217
218 static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
219 {
220 struct s3c_rtc *info = dev_get_drvdata(dev);
221 int year = tm->tm_year - 100;
222 int ret;
223
224 dev_dbg(dev, "set time %ptR\n", tm);
225
226 /* we get around y2k by simply not supporting it */
227
228 if (year < 0 || year >= 100) {
229 dev_err(dev, "rtc only supports 100 years\n");
230 return -EINVAL;
231 }
232
233 ret = s3c_rtc_enable_clk(info);
234 if (ret)
235 return ret;
236
237 writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_RTCSEC);
238 writeb(bin2bcd(tm->tm_min), info->base + S3C2410_RTCMIN);
239 writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_RTCHOUR);
240 writeb(bin2bcd(tm->tm_mday), info->base + S3C2410_RTCDATE);
241 writeb(bin2bcd(tm->tm_mon + 1), info->base + S3C2410_RTCMON);
242 writeb(bin2bcd(year), info->base + S3C2410_RTCYEAR);
243
244 s3c_rtc_disable_clk(info);
245
246 return 0;
247 }
248
249 static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
250 {
251 struct s3c_rtc *info = dev_get_drvdata(dev);
252 struct rtc_time *alm_tm = &alrm->time;
253 unsigned int alm_en;
254 int ret;
255
256 ret = s3c_rtc_enable_clk(info);
257 if (ret)
258 return ret;
259
260 alm_tm->tm_sec = readb(info->base + S3C2410_ALMSEC);
261 alm_tm->tm_min = readb(info->base + S3C2410_ALMMIN);
262 alm_tm->tm_hour = readb(info->base + S3C2410_ALMHOUR);
263 alm_tm->tm_mon = readb(info->base + S3C2410_ALMMON);
264 alm_tm->tm_mday = readb(info->base + S3C2410_ALMDATE);
265 alm_tm->tm_year = readb(info->base + S3C2410_ALMYEAR);
266
267 alm_en = readb(info->base + S3C2410_RTCALM);
268
269 s3c_rtc_disable_clk(info);
270
271 alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0;
272
273 dev_dbg(dev, "read alarm %d, %ptR\n", alm_en, alm_tm);
274
275 /* decode the alarm enable field */
276 if (alm_en & S3C2410_RTCALM_SECEN)
277 alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec);
278
279 if (alm_en & S3C2410_RTCALM_MINEN)
280 alm_tm->tm_min = bcd2bin(alm_tm->tm_min);
281
282 if (alm_en & S3C2410_RTCALM_HOUREN)
283 alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour);
284
285 if (alm_en & S3C2410_RTCALM_DAYEN)
286 alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday);
287
288 if (alm_en & S3C2410_RTCALM_MONEN) {
289 alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon);
290 alm_tm->tm_mon -= 1;
291 }
292
293 if (alm_en & S3C2410_RTCALM_YEAREN)
294 alm_tm->tm_year = bcd2bin(alm_tm->tm_year);
295
296 return 0;
297 }
298
299 static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
300 {
301 struct s3c_rtc *info = dev_get_drvdata(dev);
302 struct rtc_time *tm = &alrm->time;
303 unsigned int alrm_en;
304 int ret;
305
306 dev_dbg(dev, "s3c_rtc_setalarm: %d, %ptR\n", alrm->enabled, tm);
307
308 ret = s3c_rtc_enable_clk(info);
309 if (ret)
310 return ret;
311
312 alrm_en = readb(info->base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
313 writeb(0x00, info->base + S3C2410_RTCALM);
314
315 if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
316 alrm_en |= S3C2410_RTCALM_SECEN;
317 writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_ALMSEC);
318 }
319
320 if (tm->tm_min < 60 && tm->tm_min >= 0) {
321 alrm_en |= S3C2410_RTCALM_MINEN;
322 writeb(bin2bcd(tm->tm_min), info->base + S3C2410_ALMMIN);
323 }
324
325 if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
326 alrm_en |= S3C2410_RTCALM_HOUREN;
327 writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_ALMHOUR);
328 }
329
330 if (tm->tm_mon < 12 && tm->tm_mon >= 0) {
331 alrm_en |= S3C2410_RTCALM_MONEN;
332 writeb(bin2bcd(tm->tm_mon + 1), info->base + S3C2410_ALMMON);
333 }
334
335 if (tm->tm_mday <= 31 && tm->tm_mday >= 1) {
336 alrm_en |= S3C2410_RTCALM_DAYEN;
337 writeb(bin2bcd(tm->tm_mday), info->base + S3C2410_ALMDATE);
338 }
339
340 dev_dbg(dev, "setting S3C2410_RTCALM to %08x\n", alrm_en);
341
342 writeb(alrm_en, info->base + S3C2410_RTCALM);
343
344 s3c_rtc_setaie(dev, alrm->enabled);
345
346 s3c_rtc_disable_clk(info);
347
348 return 0;
349 }
350
351 static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
352 {
353 struct s3c_rtc *info = dev_get_drvdata(dev);
354 int ret;
355
356 ret = s3c_rtc_enable_clk(info);
357 if (ret)
358 return ret;
359
360 if (info->data->enable_tick)
361 info->data->enable_tick(info, seq);
362
363 s3c_rtc_disable_clk(info);
364
365 return 0;
366 }
367
368 static const struct rtc_class_ops s3c_rtcops = {
369 .read_time = s3c_rtc_gettime,
370 .set_time = s3c_rtc_settime,
371 .read_alarm = s3c_rtc_getalarm,
372 .set_alarm = s3c_rtc_setalarm,
373 .proc = s3c_rtc_proc,
374 .alarm_irq_enable = s3c_rtc_setaie,
375 };
376
377 static void s3c24xx_rtc_enable(struct s3c_rtc *info)
378 {
379 unsigned int con, tmp;
380
381 con = readw(info->base + S3C2410_RTCCON);
382 /* re-enable the device, and check it is ok */
383 if ((con & S3C2410_RTCCON_RTCEN) == 0) {
384 dev_info(info->dev, "rtc disabled, re-enabling\n");
385
386 tmp = readw(info->base + S3C2410_RTCCON);
387 writew(tmp | S3C2410_RTCCON_RTCEN, info->base + S3C2410_RTCCON);
388 }
389
390 if (con & S3C2410_RTCCON_CNTSEL) {
391 dev_info(info->dev, "removing RTCCON_CNTSEL\n");
392
393 tmp = readw(info->base + S3C2410_RTCCON);
394 writew(tmp & ~S3C2410_RTCCON_CNTSEL,
395 info->base + S3C2410_RTCCON);
396 }
397
398 if (con & S3C2410_RTCCON_CLKRST) {
399 dev_info(info->dev, "removing RTCCON_CLKRST\n");
400
401 tmp = readw(info->base + S3C2410_RTCCON);
402 writew(tmp & ~S3C2410_RTCCON_CLKRST,
403 info->base + S3C2410_RTCCON);
404 }
405 }
406
407 static void s3c24xx_rtc_disable(struct s3c_rtc *info)
408 {
409 unsigned int con;
410
411 con = readw(info->base + S3C2410_RTCCON);
412 con &= ~S3C2410_RTCCON_RTCEN;
413 writew(con, info->base + S3C2410_RTCCON);
414
415 con = readb(info->base + S3C2410_TICNT);
416 con &= ~S3C2410_TICNT_ENABLE;
417 writeb(con, info->base + S3C2410_TICNT);
418 }
419
420 static void s3c6410_rtc_disable(struct s3c_rtc *info)
421 {
422 unsigned int con;
423
424 con = readw(info->base + S3C2410_RTCCON);
425 con &= ~S3C64XX_RTCCON_TICEN;
426 con &= ~S3C2410_RTCCON_RTCEN;
427 writew(con, info->base + S3C2410_RTCCON);
428 }
429
430 static int s3c_rtc_remove(struct platform_device *pdev)
431 {
432 struct s3c_rtc *info = platform_get_drvdata(pdev);
433
434 s3c_rtc_setaie(info->dev, 0);
435
436 if (info->data->needs_src_clk)
437 clk_unprepare(info->rtc_src_clk);
438 clk_unprepare(info->rtc_clk);
439
440 return 0;
441 }
442
443 static int s3c_rtc_probe(struct platform_device *pdev)
444 {
445 struct s3c_rtc *info = NULL;
446 struct rtc_time rtc_tm;
447 struct resource *res;
448 int ret;
449
450 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
451 if (!info)
452 return -ENOMEM;
453
454 /* find the IRQs */
455 info->irq_tick = platform_get_irq(pdev, 1);
456 if (info->irq_tick < 0) {
457 dev_err(&pdev->dev, "no irq for rtc tick\n");
458 return info->irq_tick;
459 }
460
461 info->dev = &pdev->dev;
462 info->data = of_device_get_match_data(&pdev->dev);
463 if (!info->data) {
464 dev_err(&pdev->dev, "failed getting s3c_rtc_data\n");
465 return -EINVAL;
466 }
467 spin_lock_init(&info->pie_lock);
468 spin_lock_init(&info->alarm_lock);
469
470 platform_set_drvdata(pdev, info);
471
472 info->irq_alarm = platform_get_irq(pdev, 0);
473 if (info->irq_alarm < 0) {
474 dev_err(&pdev->dev, "no irq for alarm\n");
475 return info->irq_alarm;
476 }
477
478 dev_dbg(&pdev->dev, "s3c2410_rtc: tick irq %d, alarm irq %d\n",
479 info->irq_tick, info->irq_alarm);
480
481 /* get the memory region */
482 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
483 info->base = devm_ioremap_resource(&pdev->dev, res);
484 if (IS_ERR(info->base))
485 return PTR_ERR(info->base);
486
487 info->rtc_clk = devm_clk_get(&pdev->dev, "rtc");
488 if (IS_ERR(info->rtc_clk)) {
489 ret = PTR_ERR(info->rtc_clk);
490 if (ret != -EPROBE_DEFER)
491 dev_err(&pdev->dev, "failed to find rtc clock\n");
492 else
493 dev_dbg(&pdev->dev, "probe deferred due to missing rtc clk\n");
494 return ret;
495 }
496 ret = clk_prepare_enable(info->rtc_clk);
497 if (ret)
498 return ret;
499
500 if (info->data->needs_src_clk) {
501 info->rtc_src_clk = devm_clk_get(&pdev->dev, "rtc_src");
502 if (IS_ERR(info->rtc_src_clk)) {
503 ret = PTR_ERR(info->rtc_src_clk);
504 if (ret != -EPROBE_DEFER)
505 dev_err(&pdev->dev,
506 "failed to find rtc source clock\n");
507 else
508 dev_dbg(&pdev->dev,
509 "probe deferred due to missing rtc src clk\n");
510 goto err_src_clk;
511 }
512 ret = clk_prepare_enable(info->rtc_src_clk);
513 if (ret)
514 goto err_src_clk;
515 }
516
517 /* check to see if everything is setup correctly */
518 if (info->data->enable)
519 info->data->enable(info);
520
521 dev_dbg(&pdev->dev, "s3c2410_rtc: RTCCON=%02x\n",
522 readw(info->base + S3C2410_RTCCON));
523
524 device_init_wakeup(&pdev->dev, 1);
525
526 /* Check RTC Time */
527 if (s3c_rtc_gettime(&pdev->dev, &rtc_tm)) {
528 rtc_tm.tm_year = 100;
529 rtc_tm.tm_mon = 0;
530 rtc_tm.tm_mday = 1;
531 rtc_tm.tm_hour = 0;
532 rtc_tm.tm_min = 0;
533 rtc_tm.tm_sec = 0;
534
535 s3c_rtc_settime(&pdev->dev, &rtc_tm);
536
537 dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n");
538 }
539
540 /* register RTC and exit */
541 info->rtc = devm_rtc_device_register(&pdev->dev, "s3c", &s3c_rtcops,
542 THIS_MODULE);
543 if (IS_ERR(info->rtc)) {
544 dev_err(&pdev->dev, "cannot attach rtc\n");
545 ret = PTR_ERR(info->rtc);
546 goto err_nortc;
547 }
548
549 ret = devm_request_irq(&pdev->dev, info->irq_alarm, s3c_rtc_alarmirq,
550 0, "s3c2410-rtc alarm", info);
551 if (ret) {
552 dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_alarm, ret);
553 goto err_nortc;
554 }
555
556 ret = devm_request_irq(&pdev->dev, info->irq_tick, s3c_rtc_tickirq,
557 0, "s3c2410-rtc tick", info);
558 if (ret) {
559 dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_tick, ret);
560 goto err_nortc;
561 }
562
563 if (info->data->select_tick_clk)
564 info->data->select_tick_clk(info);
565
566 s3c_rtc_setfreq(info, 1);
567
568 s3c_rtc_disable_clk(info);
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 err_src_clk:
579 clk_disable_unprepare(info->rtc_clk);
580
581 return ret;
582 }
583
584 #ifdef CONFIG_PM_SLEEP
585
586 static int s3c_rtc_suspend(struct device *dev)
587 {
588 struct s3c_rtc *info = dev_get_drvdata(dev);
589 int ret;
590
591 ret = s3c_rtc_enable_clk(info);
592 if (ret)
593 return ret;
594
595 /* save TICNT for anyone using periodic interrupts */
596 if (info->data->save_tick_cnt)
597 info->data->save_tick_cnt(info);
598
599 if (info->data->disable)
600 info->data->disable(info);
601
602 if (device_may_wakeup(dev) && !info->wake_en) {
603 if (enable_irq_wake(info->irq_alarm) == 0)
604 info->wake_en = true;
605 else
606 dev_err(dev, "enable_irq_wake failed\n");
607 }
608
609 return 0;
610 }
611
612 static int s3c_rtc_resume(struct device *dev)
613 {
614 struct s3c_rtc *info = dev_get_drvdata(dev);
615
616 if (info->data->enable)
617 info->data->enable(info);
618
619 if (info->data->restore_tick_cnt)
620 info->data->restore_tick_cnt(info);
621
622 s3c_rtc_disable_clk(info);
623
624 if (device_may_wakeup(dev) && info->wake_en) {
625 disable_irq_wake(info->irq_alarm);
626 info->wake_en = false;
627 }
628
629 return 0;
630 }
631 #endif
632 static SIMPLE_DEV_PM_OPS(s3c_rtc_pm_ops, s3c_rtc_suspend, s3c_rtc_resume);
633
634 static void s3c24xx_rtc_irq(struct s3c_rtc *info, int mask)
635 {
636 rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF);
637 }
638
639 static void s3c6410_rtc_irq(struct s3c_rtc *info, int mask)
640 {
641 rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF);
642 writeb(mask, info->base + S3C2410_INTP);
643 }
644
645 static void s3c2410_rtc_setfreq(struct s3c_rtc *info, int freq)
646 {
647 unsigned int tmp = 0;
648 int val;
649
650 tmp = readb(info->base + S3C2410_TICNT);
651 tmp &= S3C2410_TICNT_ENABLE;
652
653 val = (info->rtc->max_user_freq / freq) - 1;
654 tmp |= val;
655
656 writel(tmp, info->base + S3C2410_TICNT);
657 }
658
659 static void s3c2416_rtc_setfreq(struct s3c_rtc *info, int freq)
660 {
661 unsigned int tmp = 0;
662 int val;
663
664 tmp = readb(info->base + S3C2410_TICNT);
665 tmp &= S3C2410_TICNT_ENABLE;
666
667 val = (info->rtc->max_user_freq / freq) - 1;
668
669 tmp |= S3C2443_TICNT_PART(val);
670 writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1);
671
672 writel(S3C2416_TICNT2_PART(val), info->base + S3C2416_TICNT2);
673
674 writel(tmp, info->base + S3C2410_TICNT);
675 }
676
677 static void s3c2443_rtc_setfreq(struct s3c_rtc *info, int freq)
678 {
679 unsigned int tmp = 0;
680 int val;
681
682 tmp = readb(info->base + S3C2410_TICNT);
683 tmp &= S3C2410_TICNT_ENABLE;
684
685 val = (info->rtc->max_user_freq / freq) - 1;
686
687 tmp |= S3C2443_TICNT_PART(val);
688 writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1);
689
690 writel(tmp, info->base + S3C2410_TICNT);
691 }
692
693 static void s3c6410_rtc_setfreq(struct s3c_rtc *info, int freq)
694 {
695 int val;
696
697 val = (info->rtc->max_user_freq / freq) - 1;
698 writel(val, info->base + S3C2410_TICNT);
699 }
700
701 static void s3c24xx_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq)
702 {
703 unsigned int ticnt;
704
705 ticnt = readb(info->base + S3C2410_TICNT);
706 ticnt &= S3C2410_TICNT_ENABLE;
707
708 seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no");
709 }
710
711 static void s3c2416_rtc_select_tick_clk(struct s3c_rtc *info)
712 {
713 unsigned int con;
714
715 con = readw(info->base + S3C2410_RTCCON);
716 con |= S3C2443_RTCCON_TICSEL;
717 writew(con, info->base + S3C2410_RTCCON);
718 }
719
720 static void s3c6410_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq)
721 {
722 unsigned int ticnt;
723
724 ticnt = readw(info->base + S3C2410_RTCCON);
725 ticnt &= S3C64XX_RTCCON_TICEN;
726
727 seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no");
728 }
729
730 static void s3c24xx_rtc_save_tick_cnt(struct s3c_rtc *info)
731 {
732 info->ticnt_save = readb(info->base + S3C2410_TICNT);
733 }
734
735 static void s3c24xx_rtc_restore_tick_cnt(struct s3c_rtc *info)
736 {
737 writeb(info->ticnt_save, info->base + S3C2410_TICNT);
738 }
739
740 static void s3c6410_rtc_save_tick_cnt(struct s3c_rtc *info)
741 {
742 info->ticnt_en_save = readw(info->base + S3C2410_RTCCON);
743 info->ticnt_en_save &= S3C64XX_RTCCON_TICEN;
744 info->ticnt_save = readl(info->base + S3C2410_TICNT);
745 }
746
747 static void s3c6410_rtc_restore_tick_cnt(struct s3c_rtc *info)
748 {
749 unsigned int con;
750
751 writel(info->ticnt_save, info->base + S3C2410_TICNT);
752 if (info->ticnt_en_save) {
753 con = readw(info->base + S3C2410_RTCCON);
754 writew(con | info->ticnt_en_save, info->base + S3C2410_RTCCON);
755 }
756 }
757
758 static struct s3c_rtc_data const s3c2410_rtc_data = {
759 .max_user_freq = 128,
760 .irq_handler = s3c24xx_rtc_irq,
761 .set_freq = s3c2410_rtc_setfreq,
762 .enable_tick = s3c24xx_rtc_enable_tick,
763 .save_tick_cnt = s3c24xx_rtc_save_tick_cnt,
764 .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt,
765 .enable = s3c24xx_rtc_enable,
766 .disable = s3c24xx_rtc_disable,
767 };
768
769 static struct s3c_rtc_data const s3c2416_rtc_data = {
770 .max_user_freq = 32768,
771 .irq_handler = s3c24xx_rtc_irq,
772 .set_freq = s3c2416_rtc_setfreq,
773 .enable_tick = s3c24xx_rtc_enable_tick,
774 .select_tick_clk = s3c2416_rtc_select_tick_clk,
775 .save_tick_cnt = s3c24xx_rtc_save_tick_cnt,
776 .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt,
777 .enable = s3c24xx_rtc_enable,
778 .disable = s3c24xx_rtc_disable,
779 };
780
781 static struct s3c_rtc_data const s3c2443_rtc_data = {
782 .max_user_freq = 32768,
783 .irq_handler = s3c24xx_rtc_irq,
784 .set_freq = s3c2443_rtc_setfreq,
785 .enable_tick = s3c24xx_rtc_enable_tick,
786 .select_tick_clk = s3c2416_rtc_select_tick_clk,
787 .save_tick_cnt = s3c24xx_rtc_save_tick_cnt,
788 .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt,
789 .enable = s3c24xx_rtc_enable,
790 .disable = s3c24xx_rtc_disable,
791 };
792
793 static struct s3c_rtc_data const s3c6410_rtc_data = {
794 .max_user_freq = 32768,
795 .needs_src_clk = true,
796 .irq_handler = s3c6410_rtc_irq,
797 .set_freq = s3c6410_rtc_setfreq,
798 .enable_tick = s3c6410_rtc_enable_tick,
799 .save_tick_cnt = s3c6410_rtc_save_tick_cnt,
800 .restore_tick_cnt = s3c6410_rtc_restore_tick_cnt,
801 .enable = s3c24xx_rtc_enable,
802 .disable = s3c6410_rtc_disable,
803 };
804
805 static const struct of_device_id s3c_rtc_dt_match[] = {
806 {
807 .compatible = "samsung,s3c2410-rtc",
808 .data = &s3c2410_rtc_data,
809 }, {
810 .compatible = "samsung,s3c2416-rtc",
811 .data = &s3c2416_rtc_data,
812 }, {
813 .compatible = "samsung,s3c2443-rtc",
814 .data = &s3c2443_rtc_data,
815 }, {
816 .compatible = "samsung,s3c6410-rtc",
817 .data = &s3c6410_rtc_data,
818 }, {
819 .compatible = "samsung,exynos3250-rtc",
820 .data = &s3c6410_rtc_data,
821 },
822 { /* sentinel */ },
823 };
824 MODULE_DEVICE_TABLE(of, s3c_rtc_dt_match);
825
826 static struct platform_driver s3c_rtc_driver = {
827 .probe = s3c_rtc_probe,
828 .remove = s3c_rtc_remove,
829 .driver = {
830 .name = "s3c-rtc",
831 .pm = &s3c_rtc_pm_ops,
832 .of_match_table = of_match_ptr(s3c_rtc_dt_match),
833 },
834 };
835 module_platform_driver(s3c_rtc_driver);
836
837 MODULE_DESCRIPTION("Samsung S3C RTC Driver");
838 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
839 MODULE_LICENSE("GPL");
840 MODULE_ALIAS("platform:s3c2410-rtc");
Linux with added FPC-III support