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Merge branch 'x86-headers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[karo-tx-linux.git] / drivers / rtc / rtc-s3c.c
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
35 struct 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
56 struct 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
70 static 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
84 static 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 */
99 static 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
109 static 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 */
120 static 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 */
147 static 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 */
163 static 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
208 static 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
238 static 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
300 static 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
306         dev_dbg(dev, "s3c_rtc_setalarm: %d, %04d.%02d.%02d %02d:%02d:%02d\n",
307                  alrm->enabled,
308                  1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday,
309                  tm->tm_hour, tm->tm_min, tm->tm_sec);
310
311         s3c_rtc_enable_clk(info);
312
313         alrm_en = readb(info->base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
314         writeb(0x00, info->base + S3C2410_RTCALM);
315
316         if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
317                 alrm_en |= S3C2410_RTCALM_SECEN;
318                 writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_ALMSEC);
319         }
320
321         if (tm->tm_min < 60 && tm->tm_min >= 0) {
322                 alrm_en |= S3C2410_RTCALM_MINEN;
323                 writeb(bin2bcd(tm->tm_min), info->base + S3C2410_ALMMIN);
324         }
325
326         if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
327                 alrm_en |= S3C2410_RTCALM_HOUREN;
328                 writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_ALMHOUR);
329         }
330
331         dev_dbg(dev, "setting S3C2410_RTCALM to %08x\n", alrm_en);
332
333         writeb(alrm_en, info->base + S3C2410_RTCALM);
334
335         s3c_rtc_disable_clk(info);
336
337         s3c_rtc_setaie(dev, alrm->enabled);
338
339         return 0;
340 }
341
342 static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
343 {
344         struct s3c_rtc *info = dev_get_drvdata(dev);
345
346         s3c_rtc_enable_clk(info);
347
348         if (info->data->enable_tick)
349                 info->data->enable_tick(info, seq);
350
351         s3c_rtc_disable_clk(info);
352
353         return 0;
354 }
355
356 static const struct rtc_class_ops s3c_rtcops = {
357         .read_time      = s3c_rtc_gettime,
358         .set_time       = s3c_rtc_settime,
359         .read_alarm     = s3c_rtc_getalarm,
360         .set_alarm      = s3c_rtc_setalarm,
361         .proc           = s3c_rtc_proc,
362         .alarm_irq_enable = s3c_rtc_setaie,
363 };
364
365 static void s3c24xx_rtc_enable(struct s3c_rtc *info)
366 {
367         unsigned int con, tmp;
368
369         con = readw(info->base + S3C2410_RTCCON);
370         /* re-enable the device, and check it is ok */
371         if ((con & S3C2410_RTCCON_RTCEN) == 0) {
372                 dev_info(info->dev, "rtc disabled, re-enabling\n");
373
374                 tmp = readw(info->base + S3C2410_RTCCON);
375                 writew(tmp | S3C2410_RTCCON_RTCEN,
376                         info->base + S3C2410_RTCCON);
377         }
378
379         if (con & S3C2410_RTCCON_CNTSEL) {
380                 dev_info(info->dev, "removing RTCCON_CNTSEL\n");
381
382                 tmp = readw(info->base + S3C2410_RTCCON);
383                 writew(tmp & ~S3C2410_RTCCON_CNTSEL,
384                         info->base + S3C2410_RTCCON);
385         }
386
387         if (con & S3C2410_RTCCON_CLKRST) {
388                 dev_info(info->dev, "removing RTCCON_CLKRST\n");
389
390                 tmp = readw(info->base + S3C2410_RTCCON);
391                 writew(tmp & ~S3C2410_RTCCON_CLKRST,
392                         info->base + S3C2410_RTCCON);
393         }
394 }
395
396 static void s3c24xx_rtc_disable(struct s3c_rtc *info)
397 {
398         unsigned int con;
399
400         con = readw(info->base + S3C2410_RTCCON);
401         con &= ~S3C2410_RTCCON_RTCEN;
402         writew(con, info->base + S3C2410_RTCCON);
403
404         con = readb(info->base + S3C2410_TICNT);
405         con &= ~S3C2410_TICNT_ENABLE;
406         writeb(con, info->base + S3C2410_TICNT);
407 }
408
409 static void s3c6410_rtc_disable(struct s3c_rtc *info)
410 {
411         unsigned int con;
412
413         con = readw(info->base + S3C2410_RTCCON);
414         con &= ~S3C64XX_RTCCON_TICEN;
415         con &= ~S3C2410_RTCCON_RTCEN;
416         writew(con, info->base + S3C2410_RTCCON);
417 }
418
419 static int s3c_rtc_remove(struct platform_device *pdev)
420 {
421         struct s3c_rtc *info = platform_get_drvdata(pdev);
422
423         s3c_rtc_setaie(info->dev, 0);
424
425         if (info->data->needs_src_clk)
426                 clk_unprepare(info->rtc_src_clk);
427         clk_unprepare(info->rtc_clk);
428
429         return 0;
430 }
431
432 static const struct of_device_id s3c_rtc_dt_match[];
433
434 static struct s3c_rtc_data *s3c_rtc_get_data(struct platform_device *pdev)
435 {
436         const struct of_device_id *match;
437
438         match = of_match_node(s3c_rtc_dt_match, pdev->dev.of_node);
439         return (struct s3c_rtc_data *)match->data;
440 }
441
442 static int s3c_rtc_probe(struct platform_device *pdev)
443 {
444         struct s3c_rtc *info = NULL;
445         struct rtc_time rtc_tm;
446         struct resource *res;
447         int ret;
448
449         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
450         if (!info)
451                 return -ENOMEM;
452
453         /* find the IRQs */
454         info->irq_tick = platform_get_irq(pdev, 1);
455         if (info->irq_tick < 0) {
456                 dev_err(&pdev->dev, "no irq for rtc tick\n");
457                 return info->irq_tick;
458         }
459
460         info->dev = &pdev->dev;
461         info->data = s3c_rtc_get_data(pdev);
462         if (!info->data) {
463                 dev_err(&pdev->dev, "failed getting s3c_rtc_data\n");
464                 return -EINVAL;
465         }
466         spin_lock_init(&info->pie_lock);
467         spin_lock_init(&info->alarm_clk_lock);
468
469         platform_set_drvdata(pdev, info);
470
471         info->irq_alarm = platform_get_irq(pdev, 0);
472         if (info->irq_alarm < 0) {
473                 dev_err(&pdev->dev, "no irq for alarm\n");
474                 return info->irq_alarm;
475         }
476
477         dev_dbg(&pdev->dev, "s3c2410_rtc: tick irq %d, alarm irq %d\n",
478                  info->irq_tick, info->irq_alarm);
479
480         /* get the memory region */
481         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
482         info->base = devm_ioremap_resource(&pdev->dev, res);
483         if (IS_ERR(info->base))
484                 return PTR_ERR(info->base);
485
486         info->rtc_clk = devm_clk_get(&pdev->dev, "rtc");
487         if (IS_ERR(info->rtc_clk)) {
488                 dev_err(&pdev->dev, "failed to find rtc clock\n");
489                 return PTR_ERR(info->rtc_clk);
490         }
491         clk_prepare_enable(info->rtc_clk);
492
493         if (info->data->needs_src_clk) {
494                 info->rtc_src_clk = devm_clk_get(&pdev->dev, "rtc_src");
495                 if (IS_ERR(info->rtc_src_clk)) {
496                         dev_err(&pdev->dev,
497                                 "failed to find rtc source clock\n");
498                         clk_disable_unprepare(info->rtc_clk);
499                         return PTR_ERR(info->rtc_src_clk);
500                 }
501                 clk_prepare_enable(info->rtc_src_clk);
502         }
503
504         /* check to see if everything is setup correctly */
505         if (info->data->enable)
506                 info->data->enable(info);
507
508         dev_dbg(&pdev->dev, "s3c2410_rtc: RTCCON=%02x\n",
509                  readw(info->base + S3C2410_RTCCON));
510
511         device_init_wakeup(&pdev->dev, 1);
512
513         /* Check RTC Time */
514         if (s3c_rtc_gettime(&pdev->dev, &rtc_tm)) {
515                 rtc_tm.tm_year  = 100;
516                 rtc_tm.tm_mon   = 0;
517                 rtc_tm.tm_mday  = 1;
518                 rtc_tm.tm_hour  = 0;
519                 rtc_tm.tm_min   = 0;
520                 rtc_tm.tm_sec   = 0;
521
522                 s3c_rtc_settime(&pdev->dev, &rtc_tm);
523
524                 dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n");
525         }
526
527         /* register RTC and exit */
528         info->rtc = devm_rtc_device_register(&pdev->dev, "s3c", &s3c_rtcops,
529                                   THIS_MODULE);
530         if (IS_ERR(info->rtc)) {
531                 dev_err(&pdev->dev, "cannot attach rtc\n");
532                 ret = PTR_ERR(info->rtc);
533                 goto err_nortc;
534         }
535
536         ret = devm_request_irq(&pdev->dev, info->irq_alarm, s3c_rtc_alarmirq,
537                           0,  "s3c2410-rtc alarm", info);
538         if (ret) {
539                 dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_alarm, ret);
540                 goto err_nortc;
541         }
542
543         ret = devm_request_irq(&pdev->dev, info->irq_tick, s3c_rtc_tickirq,
544                           0,  "s3c2410-rtc tick", info);
545         if (ret) {
546                 dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_tick, ret);
547                 goto err_nortc;
548         }
549
550         if (info->data->select_tick_clk)
551                 info->data->select_tick_clk(info);
552
553         s3c_rtc_setfreq(info, 1);
554
555         s3c_rtc_disable_clk(info);
556
557         return 0;
558
559  err_nortc:
560         if (info->data->disable)
561                 info->data->disable(info);
562
563         if (info->data->needs_src_clk)
564                 clk_disable_unprepare(info->rtc_src_clk);
565         clk_disable_unprepare(info->rtc_clk);
566
567         return ret;
568 }
569
570 #ifdef CONFIG_PM_SLEEP
571
572 static int s3c_rtc_suspend(struct device *dev)
573 {
574         struct s3c_rtc *info = dev_get_drvdata(dev);
575
576         s3c_rtc_enable_clk(info);
577
578         /* save TICNT for anyone using periodic interrupts */
579         if (info->data->save_tick_cnt)
580                 info->data->save_tick_cnt(info);
581
582         if (info->data->disable)
583                 info->data->disable(info);
584
585         if (device_may_wakeup(dev) && !info->wake_en) {
586                 if (enable_irq_wake(info->irq_alarm) == 0)
587                         info->wake_en = true;
588                 else
589                         dev_err(dev, "enable_irq_wake failed\n");
590         }
591
592         return 0;
593 }
594
595 static int s3c_rtc_resume(struct device *dev)
596 {
597         struct s3c_rtc *info = dev_get_drvdata(dev);
598
599         if (info->data->enable)
600                 info->data->enable(info);
601
602         if (info->data->restore_tick_cnt)
603                 info->data->restore_tick_cnt(info);
604
605         s3c_rtc_disable_clk(info);
606
607         if (device_may_wakeup(dev) && info->wake_en) {
608                 disable_irq_wake(info->irq_alarm);
609                 info->wake_en = false;
610         }
611
612         return 0;
613 }
614 #endif
615 static SIMPLE_DEV_PM_OPS(s3c_rtc_pm_ops, s3c_rtc_suspend, s3c_rtc_resume);
616
617 static void s3c24xx_rtc_irq(struct s3c_rtc *info, int mask)
618 {
619         rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF);
620 }
621
622 static void s3c6410_rtc_irq(struct s3c_rtc *info, int mask)
623 {
624         rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF);
625         writeb(mask, info->base + S3C2410_INTP);
626 }
627
628 static void s3c2410_rtc_setfreq(struct s3c_rtc *info, int freq)
629 {
630         unsigned int tmp = 0;
631         int val;
632
633         tmp = readb(info->base + S3C2410_TICNT);
634         tmp &= S3C2410_TICNT_ENABLE;
635
636         val = (info->rtc->max_user_freq / freq) - 1;
637         tmp |= val;
638
639         writel(tmp, info->base + S3C2410_TICNT);
640 }
641
642 static void s3c2416_rtc_setfreq(struct s3c_rtc *info, int freq)
643 {
644         unsigned int tmp = 0;
645         int val;
646
647         tmp = readb(info->base + S3C2410_TICNT);
648         tmp &= S3C2410_TICNT_ENABLE;
649
650         val = (info->rtc->max_user_freq / freq) - 1;
651
652         tmp |= S3C2443_TICNT_PART(val);
653         writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1);
654
655         writel(S3C2416_TICNT2_PART(val), info->base + S3C2416_TICNT2);
656
657         writel(tmp, info->base + S3C2410_TICNT);
658 }
659
660 static void s3c2443_rtc_setfreq(struct s3c_rtc *info, int freq)
661 {
662         unsigned int tmp = 0;
663         int val;
664
665         tmp = readb(info->base + S3C2410_TICNT);
666         tmp &= S3C2410_TICNT_ENABLE;
667
668         val = (info->rtc->max_user_freq / freq) - 1;
669
670         tmp |= S3C2443_TICNT_PART(val);
671         writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1);
672
673         writel(tmp, info->base + S3C2410_TICNT);
674 }
675
676 static void s3c6410_rtc_setfreq(struct s3c_rtc *info, int freq)
677 {
678         int val;
679
680         val = (info->rtc->max_user_freq / freq) - 1;
681         writel(val, info->base + S3C2410_TICNT);
682 }
683
684 static void s3c24xx_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq)
685 {
686         unsigned int ticnt;
687
688         ticnt = readb(info->base + S3C2410_TICNT);
689         ticnt &= S3C2410_TICNT_ENABLE;
690
691         seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt  ? "yes" : "no");
692 }
693
694 static void s3c2416_rtc_select_tick_clk(struct s3c_rtc *info)
695 {
696         unsigned int con;
697
698         con = readw(info->base + S3C2410_RTCCON);
699         con |= S3C2443_RTCCON_TICSEL;
700         writew(con, info->base + S3C2410_RTCCON);
701 }
702
703 static void s3c6410_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq)
704 {
705         unsigned int ticnt;
706
707         ticnt = readw(info->base + S3C2410_RTCCON);
708         ticnt &= S3C64XX_RTCCON_TICEN;
709
710         seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt  ? "yes" : "no");
711 }
712
713 static void s3c24xx_rtc_save_tick_cnt(struct s3c_rtc *info)
714 {
715         info->ticnt_save = readb(info->base + S3C2410_TICNT);
716 }
717
718 static void s3c24xx_rtc_restore_tick_cnt(struct s3c_rtc *info)
719 {
720         writeb(info->ticnt_save, info->base + S3C2410_TICNT);
721 }
722
723 static void s3c6410_rtc_save_tick_cnt(struct s3c_rtc *info)
724 {
725         info->ticnt_en_save = readw(info->base + S3C2410_RTCCON);
726         info->ticnt_en_save &= S3C64XX_RTCCON_TICEN;
727         info->ticnt_save = readl(info->base + S3C2410_TICNT);
728 }
729
730 static void s3c6410_rtc_restore_tick_cnt(struct s3c_rtc *info)
731 {
732         unsigned int con;
733
734         writel(info->ticnt_save, info->base + S3C2410_TICNT);
735         if (info->ticnt_en_save) {
736                 con = readw(info->base + S3C2410_RTCCON);
737                 writew(con | info->ticnt_en_save,
738                                 info->base + S3C2410_RTCCON);
739         }
740 }
741
742 static struct s3c_rtc_data const s3c2410_rtc_data = {
743         .max_user_freq          = 128,
744         .irq_handler            = s3c24xx_rtc_irq,
745         .set_freq               = s3c2410_rtc_setfreq,
746         .enable_tick            = s3c24xx_rtc_enable_tick,
747         .save_tick_cnt          = s3c24xx_rtc_save_tick_cnt,
748         .restore_tick_cnt       = s3c24xx_rtc_restore_tick_cnt,
749         .enable                 = s3c24xx_rtc_enable,
750         .disable                = s3c24xx_rtc_disable,
751 };
752
753 static struct s3c_rtc_data const s3c2416_rtc_data = {
754         .max_user_freq          = 32768,
755         .irq_handler            = s3c24xx_rtc_irq,
756         .set_freq               = s3c2416_rtc_setfreq,
757         .enable_tick            = s3c24xx_rtc_enable_tick,
758         .select_tick_clk        = s3c2416_rtc_select_tick_clk,
759         .save_tick_cnt          = s3c24xx_rtc_save_tick_cnt,
760         .restore_tick_cnt       = s3c24xx_rtc_restore_tick_cnt,
761         .enable                 = s3c24xx_rtc_enable,
762         .disable                = s3c24xx_rtc_disable,
763 };
764
765 static struct s3c_rtc_data const s3c2443_rtc_data = {
766         .max_user_freq          = 32768,
767         .irq_handler            = s3c24xx_rtc_irq,
768         .set_freq               = s3c2443_rtc_setfreq,
769         .enable_tick            = s3c24xx_rtc_enable_tick,
770         .select_tick_clk        = s3c2416_rtc_select_tick_clk,
771         .save_tick_cnt          = s3c24xx_rtc_save_tick_cnt,
772         .restore_tick_cnt       = s3c24xx_rtc_restore_tick_cnt,
773         .enable                 = s3c24xx_rtc_enable,
774         .disable                = s3c24xx_rtc_disable,
775 };
776
777 static struct s3c_rtc_data const s3c6410_rtc_data = {
778         .max_user_freq          = 32768,
779         .needs_src_clk          = true,
780         .irq_handler            = s3c6410_rtc_irq,
781         .set_freq               = s3c6410_rtc_setfreq,
782         .enable_tick            = s3c6410_rtc_enable_tick,
783         .save_tick_cnt          = s3c6410_rtc_save_tick_cnt,
784         .restore_tick_cnt       = s3c6410_rtc_restore_tick_cnt,
785         .enable                 = s3c24xx_rtc_enable,
786         .disable                = s3c6410_rtc_disable,
787 };
788
789 static const struct of_device_id s3c_rtc_dt_match[] = {
790         {
791                 .compatible = "samsung,s3c2410-rtc",
792                 .data = (void *)&s3c2410_rtc_data,
793         }, {
794                 .compatible = "samsung,s3c2416-rtc",
795                 .data = (void *)&s3c2416_rtc_data,
796         }, {
797                 .compatible = "samsung,s3c2443-rtc",
798                 .data = (void *)&s3c2443_rtc_data,
799         }, {
800                 .compatible = "samsung,s3c6410-rtc",
801                 .data = (void *)&s3c6410_rtc_data,
802         }, {
803                 .compatible = "samsung,exynos3250-rtc",
804                 .data = (void *)&s3c6410_rtc_data,
805         },
806         { /* sentinel */ },
807 };
808 MODULE_DEVICE_TABLE(of, s3c_rtc_dt_match);
809
810 static struct platform_driver s3c_rtc_driver = {
811         .probe          = s3c_rtc_probe,
812         .remove         = s3c_rtc_remove,
813         .driver         = {
814                 .name   = "s3c-rtc",
815                 .pm     = &s3c_rtc_pm_ops,
816                 .of_match_table = of_match_ptr(s3c_rtc_dt_match),
817         },
818 };
819 module_platform_driver(s3c_rtc_driver);
820
821 MODULE_DESCRIPTION("Samsung S3C RTC Driver");
822 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
823 MODULE_LICENSE("GPL");
824 MODULE_ALIAS("platform:s3c2410-rtc");