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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 spin_lock_irq(&info->pie_lock);
153
154 if (info->data->set_freq)
155 info->data->set_freq(info, freq);
156
157 spin_unlock_irq(&info->pie_lock);
158
159 return 0;
160}
161
162/* Time read/write */
163static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
164{
165 struct s3c_rtc *info = dev_get_drvdata(dev);
166 unsigned int have_retried = 0;
167
168 s3c_rtc_enable_clk(info);
169
170 retry_get_time:
171 rtc_tm->tm_min = readb(info->base + S3C2410_RTCMIN);
172 rtc_tm->tm_hour = readb(info->base + S3C2410_RTCHOUR);
173 rtc_tm->tm_mday = readb(info->base + S3C2410_RTCDATE);
174 rtc_tm->tm_mon = readb(info->base + S3C2410_RTCMON);
175 rtc_tm->tm_year = readb(info->base + S3C2410_RTCYEAR);
176 rtc_tm->tm_sec = readb(info->base + S3C2410_RTCSEC);
177
178 /* the only way to work out whether the system was mid-update
179 * when we read it is to check the second counter, and if it
180 * is zero, then we re-try the entire read
181 */
182
183 if (rtc_tm->tm_sec == 0 && !have_retried) {
184 have_retried = 1;
185 goto retry_get_time;
186 }
187
188 rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
189 rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
190 rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
191 rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
192 rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
193 rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);
194
195 s3c_rtc_disable_clk(info);
196
197 rtc_tm->tm_year += 100;
198
199 dev_dbg(dev, "read time %04d.%02d.%02d %02d:%02d:%02d\n",
200 1900 + rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday,
201 rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);
202
203 rtc_tm->tm_mon -= 1;
204
205 return rtc_valid_tm(rtc_tm);
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 int year = tm->tm_year - 100;
212
213 dev_dbg(dev, "set time %04d.%02d.%02d %02d:%02d:%02d\n",
214 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
215 tm->tm_hour, tm->tm_min, tm->tm_sec);
216
217 /* we get around y2k by simply not supporting it */
218
219 if (year < 0 || year >= 100) {
220 dev_err(dev, "rtc only supports 100 years\n");
221 return -EINVAL;
222 }
223
224 s3c_rtc_enable_clk(info);
225
226 writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_RTCSEC);
227 writeb(bin2bcd(tm->tm_min), info->base + S3C2410_RTCMIN);
228 writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_RTCHOUR);
229 writeb(bin2bcd(tm->tm_mday), info->base + S3C2410_RTCDATE);
230 writeb(bin2bcd(tm->tm_mon + 1), info->base + S3C2410_RTCMON);
231 writeb(bin2bcd(year), info->base + S3C2410_RTCYEAR);
232
233 s3c_rtc_disable_clk(info);
234
235 return 0;
236}
237
238static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
239{
240 struct s3c_rtc *info = dev_get_drvdata(dev);
241 struct rtc_time *alm_tm = &alrm->time;
242 unsigned int alm_en;
243
244 s3c_rtc_enable_clk(info);
245
246 alm_tm->tm_sec = readb(info->base + S3C2410_ALMSEC);
247 alm_tm->tm_min = readb(info->base + S3C2410_ALMMIN);
248 alm_tm->tm_hour = readb(info->base + S3C2410_ALMHOUR);
249 alm_tm->tm_mon = readb(info->base + S3C2410_ALMMON);
250 alm_tm->tm_mday = readb(info->base + S3C2410_ALMDATE);
251 alm_tm->tm_year = readb(info->base + S3C2410_ALMYEAR);
252
253 alm_en = readb(info->base + S3C2410_RTCALM);
254
255 s3c_rtc_disable_clk(info);
256
257 alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0;
258
259 dev_dbg(dev, "read alarm %d, %04d.%02d.%02d %02d:%02d:%02d\n",
260 alm_en,
261 1900 + alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday,
262 alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec);
263
264 /* decode the alarm enable field */
265 if (alm_en & S3C2410_RTCALM_SECEN)
266 alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec);
267 else
268 alm_tm->tm_sec = -1;
269
270 if (alm_en & S3C2410_RTCALM_MINEN)
271 alm_tm->tm_min = bcd2bin(alm_tm->tm_min);
272 else
273 alm_tm->tm_min = -1;
274
275 if (alm_en & S3C2410_RTCALM_HOUREN)
276 alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour);
277 else
278 alm_tm->tm_hour = -1;
279
280 if (alm_en & S3C2410_RTCALM_DAYEN)
281 alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday);
282 else
283 alm_tm->tm_mday = -1;
284
285 if (alm_en & S3C2410_RTCALM_MONEN) {
286 alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon);
287 alm_tm->tm_mon -= 1;
288 } else {
289 alm_tm->tm_mon = -1;
290 }
291
292 if (alm_en & S3C2410_RTCALM_YEAREN)
293 alm_tm->tm_year = bcd2bin(alm_tm->tm_year);
294 else
295 alm_tm->tm_year = -1;
296
297 return 0;
298}
299
300static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
301{
302 struct s3c_rtc *info = dev_get_drvdata(dev);
303 struct rtc_time *tm = &alrm->time;
304 unsigned int alrm_en;
305 int year = tm->tm_year - 100;
306
307 dev_dbg(dev, "s3c_rtc_setalarm: %d, %04d.%02d.%02d %02d:%02d:%02d\n",
308 alrm->enabled,
309 1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday,
310 tm->tm_hour, tm->tm_min, tm->tm_sec);
311
312 s3c_rtc_enable_clk(info);
313
314 alrm_en = readb(info->base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
315 writeb(0x00, info->base + S3C2410_RTCALM);
316
317 if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
318 alrm_en |= S3C2410_RTCALM_SECEN;
319 writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_ALMSEC);
320 }
321
322 if (tm->tm_min < 60 && tm->tm_min >= 0) {
323 alrm_en |= S3C2410_RTCALM_MINEN;
324 writeb(bin2bcd(tm->tm_min), info->base + S3C2410_ALMMIN);
325 }
326
327 if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
328 alrm_en |= S3C2410_RTCALM_HOUREN;
329 writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_ALMHOUR);
330 }
331
332 if (year < 100 && year >= 0) {
333 alrm_en |= S3C2410_RTCALM_YEAREN;
334 writeb(bin2bcd(year), info->base + S3C2410_ALMYEAR);
335 }
336
337 if (tm->tm_mon < 12 && tm->tm_mon >= 0) {
338 alrm_en |= S3C2410_RTCALM_MONEN;
339 writeb(bin2bcd(tm->tm_mon + 1), info->base + S3C2410_ALMMON);
340 }
341
342 if (tm->tm_mday <= 31 && tm->tm_mday >= 1) {
343 alrm_en |= S3C2410_RTCALM_DAYEN;
344 writeb(bin2bcd(tm->tm_mday), info->base + S3C2410_ALMDATE);
345 }
346
347 dev_dbg(dev, "setting S3C2410_RTCALM to %08x\n", alrm_en);
348
349 writeb(alrm_en, info->base + S3C2410_RTCALM);
350
351 s3c_rtc_disable_clk(info);
352
353 s3c_rtc_setaie(dev, alrm->enabled);
354
355 return 0;
356}
357
358static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
359{
360 struct s3c_rtc *info = dev_get_drvdata(dev);
361
362 s3c_rtc_enable_clk(info);
363
364 if (info->data->enable_tick)
365 info->data->enable_tick(info, seq);
366
367 s3c_rtc_disable_clk(info);
368
369 return 0;
370}
371
372static const struct rtc_class_ops s3c_rtcops = {
373 .read_time = s3c_rtc_gettime,
374 .set_time = s3c_rtc_settime,
375 .read_alarm = s3c_rtc_getalarm,
376 .set_alarm = s3c_rtc_setalarm,
377 .proc = s3c_rtc_proc,
378 .alarm_irq_enable = s3c_rtc_setaie,
379};
380
381static void s3c24xx_rtc_enable(struct s3c_rtc *info)
382{
383 unsigned int con, tmp;
384
385 con = readw(info->base + S3C2410_RTCCON);
386 /* re-enable the device, and check it is ok */
387 if ((con & S3C2410_RTCCON_RTCEN) == 0) {
388 dev_info(info->dev, "rtc disabled, re-enabling\n");
389
390 tmp = readw(info->base + S3C2410_RTCCON);
391 writew(tmp | S3C2410_RTCCON_RTCEN,
392 info->base + S3C2410_RTCCON);
393 }
394
395 if (con & S3C2410_RTCCON_CNTSEL) {
396 dev_info(info->dev, "removing RTCCON_CNTSEL\n");
397
398 tmp = readw(info->base + S3C2410_RTCCON);
399 writew(tmp & ~S3C2410_RTCCON_CNTSEL,
400 info->base + S3C2410_RTCCON);
401 }
402
403 if (con & S3C2410_RTCCON_CLKRST) {
404 dev_info(info->dev, "removing RTCCON_CLKRST\n");
405
406 tmp = readw(info->base + S3C2410_RTCCON);
407 writew(tmp & ~S3C2410_RTCCON_CLKRST,
408 info->base + S3C2410_RTCCON);
409 }
410}
411
412static void s3c24xx_rtc_disable(struct s3c_rtc *info)
413{
414 unsigned int con;
415
416 con = readw(info->base + S3C2410_RTCCON);
417 con &= ~S3C2410_RTCCON_RTCEN;
418 writew(con, info->base + S3C2410_RTCCON);
419
420 con = readb(info->base + S3C2410_TICNT);
421 con &= ~S3C2410_TICNT_ENABLE;
422 writeb(con, info->base + S3C2410_TICNT);
423}
424
425static void s3c6410_rtc_disable(struct s3c_rtc *info)
426{
427 unsigned int con;
428
429 con = readw(info->base + S3C2410_RTCCON);
430 con &= ~S3C64XX_RTCCON_TICEN;
431 con &= ~S3C2410_RTCCON_RTCEN;
432 writew(con, info->base + S3C2410_RTCCON);
433}
434
435static int s3c_rtc_remove(struct platform_device *pdev)
436{
437 struct s3c_rtc *info = platform_get_drvdata(pdev);
438
439 s3c_rtc_setaie(info->dev, 0);
440
441 if (info->data->needs_src_clk)
442 clk_unprepare(info->rtc_src_clk);
443 clk_unprepare(info->rtc_clk);
444
445 return 0;
446}
447
448static const struct of_device_id s3c_rtc_dt_match[];
449
450static struct s3c_rtc_data *s3c_rtc_get_data(struct platform_device *pdev)
451{
452 const struct of_device_id *match;
453
454 match = of_match_node(s3c_rtc_dt_match, pdev->dev.of_node);
455 return (struct s3c_rtc_data *)match->data;
456}
457
458static int s3c_rtc_probe(struct platform_device *pdev)
459{
460 struct s3c_rtc *info = NULL;
461 struct rtc_time rtc_tm;
462 struct resource *res;
463 int ret;
464
465 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
466 if (!info)
467 return -ENOMEM;
468
469 /* find the IRQs */
470 info->irq_tick = platform_get_irq(pdev, 1);
471 if (info->irq_tick < 0) {
472 dev_err(&pdev->dev, "no irq for rtc tick\n");
473 return info->irq_tick;
474 }
475
476 info->dev = &pdev->dev;
477 info->data = s3c_rtc_get_data(pdev);
478 if (!info->data) {
479 dev_err(&pdev->dev, "failed getting s3c_rtc_data\n");
480 return -EINVAL;
481 }
482 spin_lock_init(&info->pie_lock);
483 spin_lock_init(&info->alarm_clk_lock);
484
485 platform_set_drvdata(pdev, info);
486
487 info->irq_alarm = platform_get_irq(pdev, 0);
488 if (info->irq_alarm < 0) {
489 dev_err(&pdev->dev, "no irq for alarm\n");
490 return info->irq_alarm;
491 }
492
493 dev_dbg(&pdev->dev, "s3c2410_rtc: tick irq %d, alarm irq %d\n",
494 info->irq_tick, info->irq_alarm);
495
496 /* get the memory region */
497 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
498 info->base = devm_ioremap_resource(&pdev->dev, res);
499 if (IS_ERR(info->base))
500 return PTR_ERR(info->base);
501
502 info->rtc_clk = devm_clk_get(&pdev->dev, "rtc");
503 if (IS_ERR(info->rtc_clk)) {
504 ret = PTR_ERR(info->rtc_clk);
505 if (ret != -EPROBE_DEFER)
506 dev_err(&pdev->dev, "failed to find rtc clock\n");
507 else
508 dev_dbg(&pdev->dev, "probe deferred due to missing rtc clk\n");
509 return ret;
510 }
511 clk_prepare_enable(info->rtc_clk);
512
513 if (info->data->needs_src_clk) {
514 info->rtc_src_clk = devm_clk_get(&pdev->dev, "rtc_src");
515 if (IS_ERR(info->rtc_src_clk)) {
516 ret = PTR_ERR(info->rtc_src_clk);
517 if (ret != -EPROBE_DEFER)
518 dev_err(&pdev->dev,
519 "failed to find rtc source clock\n");
520 else
521 dev_dbg(&pdev->dev,
522 "probe deferred due to missing rtc src clk\n");
523 clk_disable_unprepare(info->rtc_clk);
524 return ret;
525 }
526 clk_prepare_enable(info->rtc_src_clk);
527 }
528
529 /* check to see if everything is setup correctly */
530 if (info->data->enable)
531 info->data->enable(info);
532
533 dev_dbg(&pdev->dev, "s3c2410_rtc: RTCCON=%02x\n",
534 readw(info->base + S3C2410_RTCCON));
535
536 device_init_wakeup(&pdev->dev, 1);
537
538 /* Check RTC Time */
539 if (s3c_rtc_gettime(&pdev->dev, &rtc_tm)) {
540 rtc_tm.tm_year = 100;
541 rtc_tm.tm_mon = 0;
542 rtc_tm.tm_mday = 1;
543 rtc_tm.tm_hour = 0;
544 rtc_tm.tm_min = 0;
545 rtc_tm.tm_sec = 0;
546
547 s3c_rtc_settime(&pdev->dev, &rtc_tm);
548
549 dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n");
550 }
551
552 /* register RTC and exit */
553 info->rtc = devm_rtc_device_register(&pdev->dev, "s3c", &s3c_rtcops,
554 THIS_MODULE);
555 if (IS_ERR(info->rtc)) {
556 dev_err(&pdev->dev, "cannot attach rtc\n");
557 ret = PTR_ERR(info->rtc);
558 goto err_nortc;
559 }
560
561 ret = devm_request_irq(&pdev->dev, info->irq_alarm, s3c_rtc_alarmirq,
562 0, "s3c2410-rtc alarm", info);
563 if (ret) {
564 dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_alarm, ret);
565 goto err_nortc;
566 }
567
568 ret = devm_request_irq(&pdev->dev, info->irq_tick, s3c_rtc_tickirq,
569 0, "s3c2410-rtc tick", info);
570 if (ret) {
571 dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_tick, ret);
572 goto err_nortc;
573 }
574
575 if (info->data->select_tick_clk)
576 info->data->select_tick_clk(info);
577
578 s3c_rtc_setfreq(info, 1);
579
580 s3c_rtc_disable_clk(info);
581
582 return 0;
583
584 err_nortc:
585 if (info->data->disable)
586 info->data->disable(info);
587
588 if (info->data->needs_src_clk)
589 clk_disable_unprepare(info->rtc_src_clk);
590 clk_disable_unprepare(info->rtc_clk);
591
592 return ret;
593}
594
595#ifdef CONFIG_PM_SLEEP
596
597static int s3c_rtc_suspend(struct device *dev)
598{
599 struct s3c_rtc *info = dev_get_drvdata(dev);
600
601 s3c_rtc_enable_clk(info);
602
603 /* save TICNT for anyone using periodic interrupts */
604 if (info->data->save_tick_cnt)
605 info->data->save_tick_cnt(info);
606
607 if (info->data->disable)
608 info->data->disable(info);
609
610 if (device_may_wakeup(dev) && !info->wake_en) {
611 if (enable_irq_wake(info->irq_alarm) == 0)
612 info->wake_en = true;
613 else
614 dev_err(dev, "enable_irq_wake failed\n");
615 }
616
617 return 0;
618}
619
620static int s3c_rtc_resume(struct device *dev)
621{
622 struct s3c_rtc *info = dev_get_drvdata(dev);
623
624 if (info->data->enable)
625 info->data->enable(info);
626
627 if (info->data->restore_tick_cnt)
628 info->data->restore_tick_cnt(info);
629
630 s3c_rtc_disable_clk(info);
631
632 if (device_may_wakeup(dev) && info->wake_en) {
633 disable_irq_wake(info->irq_alarm);
634 info->wake_en = false;
635 }
636
637 return 0;
638}
639#endif
640static SIMPLE_DEV_PM_OPS(s3c_rtc_pm_ops, s3c_rtc_suspend, s3c_rtc_resume);
641
642static void s3c24xx_rtc_irq(struct s3c_rtc *info, int mask)
643{
644 rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF);
645}
646
647static void s3c6410_rtc_irq(struct s3c_rtc *info, int mask)
648{
649 rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF);
650 writeb(mask, info->base + S3C2410_INTP);
651}
652
653static void s3c2410_rtc_setfreq(struct s3c_rtc *info, int freq)
654{
655 unsigned int tmp = 0;
656 int val;
657
658 tmp = readb(info->base + S3C2410_TICNT);
659 tmp &= S3C2410_TICNT_ENABLE;
660
661 val = (info->rtc->max_user_freq / freq) - 1;
662 tmp |= val;
663
664 writel(tmp, info->base + S3C2410_TICNT);
665}
666
667static void s3c2416_rtc_setfreq(struct s3c_rtc *info, int freq)
668{
669 unsigned int tmp = 0;
670 int val;
671
672 tmp = readb(info->base + S3C2410_TICNT);
673 tmp &= S3C2410_TICNT_ENABLE;
674
675 val = (info->rtc->max_user_freq / freq) - 1;
676
677 tmp |= S3C2443_TICNT_PART(val);
678 writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1);
679
680 writel(S3C2416_TICNT2_PART(val), info->base + S3C2416_TICNT2);
681
682 writel(tmp, info->base + S3C2410_TICNT);
683}
684
685static void s3c2443_rtc_setfreq(struct s3c_rtc *info, int freq)
686{
687 unsigned int tmp = 0;
688 int val;
689
690 tmp = readb(info->base + S3C2410_TICNT);
691 tmp &= S3C2410_TICNT_ENABLE;
692
693 val = (info->rtc->max_user_freq / freq) - 1;
694
695 tmp |= S3C2443_TICNT_PART(val);
696 writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1);
697
698 writel(tmp, info->base + S3C2410_TICNT);
699}
700
701static void s3c6410_rtc_setfreq(struct s3c_rtc *info, int freq)
702{
703 int val;
704
705 val = (info->rtc->max_user_freq / freq) - 1;
706 writel(val, info->base + S3C2410_TICNT);
707}
708
709static void s3c24xx_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq)
710{
711 unsigned int ticnt;
712
713 ticnt = readb(info->base + S3C2410_TICNT);
714 ticnt &= S3C2410_TICNT_ENABLE;
715
716 seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no");
717}
718
719static void s3c2416_rtc_select_tick_clk(struct s3c_rtc *info)
720{
721 unsigned int con;
722
723 con = readw(info->base + S3C2410_RTCCON);
724 con |= S3C2443_RTCCON_TICSEL;
725 writew(con, info->base + S3C2410_RTCCON);
726}
727
728static void s3c6410_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq)
729{
730 unsigned int ticnt;
731
732 ticnt = readw(info->base + S3C2410_RTCCON);
733 ticnt &= S3C64XX_RTCCON_TICEN;
734
735 seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no");
736}
737
738static void s3c24xx_rtc_save_tick_cnt(struct s3c_rtc *info)
739{
740 info->ticnt_save = readb(info->base + S3C2410_TICNT);
741}
742
743static void s3c24xx_rtc_restore_tick_cnt(struct s3c_rtc *info)
744{
745 writeb(info->ticnt_save, info->base + S3C2410_TICNT);
746}
747
748static void s3c6410_rtc_save_tick_cnt(struct s3c_rtc *info)
749{
750 info->ticnt_en_save = readw(info->base + S3C2410_RTCCON);
751 info->ticnt_en_save &= S3C64XX_RTCCON_TICEN;
752 info->ticnt_save = readl(info->base + S3C2410_TICNT);
753}
754
755static void s3c6410_rtc_restore_tick_cnt(struct s3c_rtc *info)
756{
757 unsigned int con;
758
759 writel(info->ticnt_save, info->base + S3C2410_TICNT);
760 if (info->ticnt_en_save) {
761 con = readw(info->base + S3C2410_RTCCON);
762 writew(con | info->ticnt_en_save,
763 info->base + S3C2410_RTCCON);
764 }
765}
766
767static struct s3c_rtc_data const s3c2410_rtc_data = {
768 .max_user_freq = 128,
769 .irq_handler = s3c24xx_rtc_irq,
770 .set_freq = s3c2410_rtc_setfreq,
771 .enable_tick = s3c24xx_rtc_enable_tick,
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 s3c2416_rtc_data = {
779 .max_user_freq = 32768,
780 .irq_handler = s3c24xx_rtc_irq,
781 .set_freq = s3c2416_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 s3c2443_rtc_data = {
791 .max_user_freq = 32768,
792 .irq_handler = s3c24xx_rtc_irq,
793 .set_freq = s3c2443_rtc_setfreq,
794 .enable_tick = s3c24xx_rtc_enable_tick,
795 .select_tick_clk = s3c2416_rtc_select_tick_clk,
796 .save_tick_cnt = s3c24xx_rtc_save_tick_cnt,
797 .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt,
798 .enable = s3c24xx_rtc_enable,
799 .disable = s3c24xx_rtc_disable,
800};
801
802static struct s3c_rtc_data const s3c6410_rtc_data = {
803 .max_user_freq = 32768,
804 .needs_src_clk = true,
805 .irq_handler = s3c6410_rtc_irq,
806 .set_freq = s3c6410_rtc_setfreq,
807 .enable_tick = s3c6410_rtc_enable_tick,
808 .save_tick_cnt = s3c6410_rtc_save_tick_cnt,
809 .restore_tick_cnt = s3c6410_rtc_restore_tick_cnt,
810 .enable = s3c24xx_rtc_enable,
811 .disable = s3c6410_rtc_disable,
812};
813
814static const struct of_device_id s3c_rtc_dt_match[] = {
815 {
816 .compatible = "samsung,s3c2410-rtc",
817 .data = (void *)&s3c2410_rtc_data,
818 }, {
819 .compatible = "samsung,s3c2416-rtc",
820 .data = (void *)&s3c2416_rtc_data,
821 }, {
822 .compatible = "samsung,s3c2443-rtc",
823 .data = (void *)&s3c2443_rtc_data,
824 }, {
825 .compatible = "samsung,s3c6410-rtc",
826 .data = (void *)&s3c6410_rtc_data,
827 }, {
828 .compatible = "samsung,exynos3250-rtc",
829 .data = (void *)&s3c6410_rtc_data,
830 },
831 { /* sentinel */ },
832};
833MODULE_DEVICE_TABLE(of, s3c_rtc_dt_match);
834
835static struct platform_driver s3c_rtc_driver = {
836 .probe = s3c_rtc_probe,
837 .remove = s3c_rtc_remove,
838 .driver = {
839 .name = "s3c-rtc",
840 .pm = &s3c_rtc_pm_ops,
841 .of_match_table = of_match_ptr(s3c_rtc_dt_match),
842 },
843};
844module_platform_driver(s3c_rtc_driver);
845
846MODULE_DESCRIPTION("Samsung S3C RTC Driver");
847MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
848MODULE_LICENSE("GPL");
849MODULE_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");