8e96c00936be7805f234f8c8d6d3d91bfc2d2223
[cascardo/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 <mach/hardware.h>
33 #include <asm/irq.h>
34 #include <plat/regs-rtc.h>
35
36 enum s3c_cpu_type {
37         TYPE_S3C2410,
38         TYPE_S3C2416,
39         TYPE_S3C2443,
40         TYPE_S3C64XX,
41 };
42
43 struct s3c_rtc_drv_data {
44         int cpu_type;
45 };
46
47 /* I have yet to find an S3C implementation with more than one
48  * of these rtc blocks in */
49
50 static struct clk *rtc_clk;
51 static void __iomem *s3c_rtc_base;
52 static int s3c_rtc_alarmno = NO_IRQ;
53 static int s3c_rtc_tickno  = NO_IRQ;
54 static enum s3c_cpu_type s3c_rtc_cpu_type;
55
56 static DEFINE_SPINLOCK(s3c_rtc_pie_lock);
57
58 static void s3c_rtc_alarm_clk_enable(bool enable)
59 {
60         static DEFINE_SPINLOCK(s3c_rtc_alarm_clk_lock);
61         static bool alarm_clk_enabled;
62         unsigned long irq_flags;
63
64         spin_lock_irqsave(&s3c_rtc_alarm_clk_lock, irq_flags);
65         if (enable) {
66                 if (!alarm_clk_enabled) {
67                         clk_enable(rtc_clk);
68                         alarm_clk_enabled = true;
69                 }
70         } else {
71                 if (alarm_clk_enabled) {
72                         clk_disable(rtc_clk);
73                         alarm_clk_enabled = false;
74                 }
75         }
76         spin_unlock_irqrestore(&s3c_rtc_alarm_clk_lock, irq_flags);
77 }
78
79 /* IRQ Handlers */
80
81 static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)
82 {
83         struct rtc_device *rdev = id;
84
85         clk_enable(rtc_clk);
86         rtc_update_irq(rdev, 1, RTC_AF | RTC_IRQF);
87
88         if (s3c_rtc_cpu_type == TYPE_S3C64XX)
89                 writeb(S3C2410_INTP_ALM, s3c_rtc_base + S3C2410_INTP);
90
91         clk_disable(rtc_clk);
92
93         s3c_rtc_alarm_clk_enable(false);
94
95         return IRQ_HANDLED;
96 }
97
98 static irqreturn_t s3c_rtc_tickirq(int irq, void *id)
99 {
100         struct rtc_device *rdev = id;
101
102         clk_enable(rtc_clk);
103         rtc_update_irq(rdev, 1, RTC_PF | RTC_IRQF);
104
105         if (s3c_rtc_cpu_type == TYPE_S3C64XX)
106                 writeb(S3C2410_INTP_TIC, s3c_rtc_base + S3C2410_INTP);
107
108         clk_disable(rtc_clk);
109         return IRQ_HANDLED;
110 }
111
112 /* Update control registers */
113 static int s3c_rtc_setaie(struct device *dev, unsigned int enabled)
114 {
115         unsigned int tmp;
116
117         dev_dbg(dev, "%s: aie=%d\n", __func__, enabled);
118
119         clk_enable(rtc_clk);
120         tmp = readb(s3c_rtc_base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
121
122         if (enabled)
123                 tmp |= S3C2410_RTCALM_ALMEN;
124
125         writeb(tmp, s3c_rtc_base + S3C2410_RTCALM);
126         clk_disable(rtc_clk);
127
128         s3c_rtc_alarm_clk_enable(enabled);
129
130         return 0;
131 }
132
133 static int s3c_rtc_setfreq(struct device *dev, int freq)
134 {
135         struct platform_device *pdev = to_platform_device(dev);
136         struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
137         unsigned int tmp = 0;
138         int val;
139
140         if (!is_power_of_2(freq))
141                 return -EINVAL;
142
143         clk_enable(rtc_clk);
144         spin_lock_irq(&s3c_rtc_pie_lock);
145
146         if (s3c_rtc_cpu_type != TYPE_S3C64XX) {
147                 tmp = readb(s3c_rtc_base + S3C2410_TICNT);
148                 tmp &= S3C2410_TICNT_ENABLE;
149         }
150
151         val = (rtc_dev->max_user_freq / freq) - 1;
152
153         if (s3c_rtc_cpu_type == TYPE_S3C2416 || s3c_rtc_cpu_type == TYPE_S3C2443) {
154                 tmp |= S3C2443_TICNT_PART(val);
155                 writel(S3C2443_TICNT1_PART(val), s3c_rtc_base + S3C2443_TICNT1);
156
157                 if (s3c_rtc_cpu_type == TYPE_S3C2416)
158                         writel(S3C2416_TICNT2_PART(val), s3c_rtc_base + S3C2416_TICNT2);
159         } else {
160                 tmp |= val;
161         }
162
163         writel(tmp, s3c_rtc_base + S3C2410_TICNT);
164         spin_unlock_irq(&s3c_rtc_pie_lock);
165         clk_disable(rtc_clk);
166
167         return 0;
168 }
169
170 /* Time read/write */
171
172 static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
173 {
174         unsigned int have_retried = 0;
175         void __iomem *base = s3c_rtc_base;
176
177         clk_enable(rtc_clk);
178  retry_get_time:
179         rtc_tm->tm_min  = readb(base + S3C2410_RTCMIN);
180         rtc_tm->tm_hour = readb(base + S3C2410_RTCHOUR);
181         rtc_tm->tm_mday = readb(base + S3C2410_RTCDATE);
182         rtc_tm->tm_mon  = readb(base + S3C2410_RTCMON);
183         rtc_tm->tm_year = readb(base + S3C2410_RTCYEAR);
184         rtc_tm->tm_sec  = readb(base + S3C2410_RTCSEC);
185
186         /* the only way to work out whether the system was mid-update
187          * when we read it is to check the second counter, and if it
188          * is zero, then we re-try the entire read
189          */
190
191         if (rtc_tm->tm_sec == 0 && !have_retried) {
192                 have_retried = 1;
193                 goto retry_get_time;
194         }
195
196         rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
197         rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
198         rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
199         rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
200         rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
201         rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);
202
203         rtc_tm->tm_year += 100;
204
205         dev_dbg(dev, "read time %04d.%02d.%02d %02d:%02d:%02d\n",
206                  1900 + rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday,
207                  rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);
208
209         rtc_tm->tm_mon -= 1;
210
211         clk_disable(rtc_clk);
212         return rtc_valid_tm(rtc_tm);
213 }
214
215 static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
216 {
217         void __iomem *base = s3c_rtc_base;
218         int year = tm->tm_year - 100;
219
220         dev_dbg(dev, "set time %04d.%02d.%02d %02d:%02d:%02d\n",
221                  1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
222                  tm->tm_hour, tm->tm_min, tm->tm_sec);
223
224         /* we get around y2k by simply not supporting it */
225
226         if (year < 0 || year >= 100) {
227                 dev_err(dev, "rtc only supports 100 years\n");
228                 return -EINVAL;
229         }
230
231         clk_enable(rtc_clk);
232         writeb(bin2bcd(tm->tm_sec),  base + S3C2410_RTCSEC);
233         writeb(bin2bcd(tm->tm_min),  base + S3C2410_RTCMIN);
234         writeb(bin2bcd(tm->tm_hour), base + S3C2410_RTCHOUR);
235         writeb(bin2bcd(tm->tm_mday), base + S3C2410_RTCDATE);
236         writeb(bin2bcd(tm->tm_mon + 1), base + S3C2410_RTCMON);
237         writeb(bin2bcd(year), base + S3C2410_RTCYEAR);
238         clk_disable(rtc_clk);
239
240         return 0;
241 }
242
243 static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
244 {
245         struct rtc_time *alm_tm = &alrm->time;
246         void __iomem *base = s3c_rtc_base;
247         unsigned int alm_en;
248
249         clk_enable(rtc_clk);
250         alm_tm->tm_sec  = readb(base + S3C2410_ALMSEC);
251         alm_tm->tm_min  = readb(base + S3C2410_ALMMIN);
252         alm_tm->tm_hour = readb(base + S3C2410_ALMHOUR);
253         alm_tm->tm_mon  = readb(base + S3C2410_ALMMON);
254         alm_tm->tm_mday = readb(base + S3C2410_ALMDATE);
255         alm_tm->tm_year = readb(base + S3C2410_ALMYEAR);
256
257         alm_en = readb(base + S3C2410_RTCALM);
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
267         /* decode the alarm enable field */
268
269         if (alm_en & S3C2410_RTCALM_SECEN)
270                 alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec);
271         else
272                 alm_tm->tm_sec = -1;
273
274         if (alm_en & S3C2410_RTCALM_MINEN)
275                 alm_tm->tm_min = bcd2bin(alm_tm->tm_min);
276         else
277                 alm_tm->tm_min = -1;
278
279         if (alm_en & S3C2410_RTCALM_HOUREN)
280                 alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour);
281         else
282                 alm_tm->tm_hour = -1;
283
284         if (alm_en & S3C2410_RTCALM_DAYEN)
285                 alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday);
286         else
287                 alm_tm->tm_mday = -1;
288
289         if (alm_en & S3C2410_RTCALM_MONEN) {
290                 alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon);
291                 alm_tm->tm_mon -= 1;
292         } else {
293                 alm_tm->tm_mon = -1;
294         }
295
296         if (alm_en & S3C2410_RTCALM_YEAREN)
297                 alm_tm->tm_year = bcd2bin(alm_tm->tm_year);
298         else
299                 alm_tm->tm_year = -1;
300
301         clk_disable(rtc_clk);
302         return 0;
303 }
304
305 static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
306 {
307         struct rtc_time *tm = &alrm->time;
308         void __iomem *base = s3c_rtc_base;
309         unsigned int alrm_en;
310
311         clk_enable(rtc_clk);
312         dev_dbg(dev, "s3c_rtc_setalarm: %d, %04d.%02d.%02d %02d:%02d:%02d\n",
313                  alrm->enabled,
314                  1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday,
315                  tm->tm_hour, tm->tm_min, tm->tm_sec);
316
317         alrm_en = readb(base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
318         writeb(0x00, base + S3C2410_RTCALM);
319
320         if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
321                 alrm_en |= S3C2410_RTCALM_SECEN;
322                 writeb(bin2bcd(tm->tm_sec), base + S3C2410_ALMSEC);
323         }
324
325         if (tm->tm_min < 60 && tm->tm_min >= 0) {
326                 alrm_en |= S3C2410_RTCALM_MINEN;
327                 writeb(bin2bcd(tm->tm_min), base + S3C2410_ALMMIN);
328         }
329
330         if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
331                 alrm_en |= S3C2410_RTCALM_HOUREN;
332                 writeb(bin2bcd(tm->tm_hour), base + S3C2410_ALMHOUR);
333         }
334
335         dev_dbg(dev, "setting S3C2410_RTCALM to %08x\n", alrm_en);
336
337         writeb(alrm_en, base + S3C2410_RTCALM);
338
339         s3c_rtc_setaie(dev, alrm->enabled);
340
341         clk_disable(rtc_clk);
342         return 0;
343 }
344
345 static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
346 {
347         unsigned int ticnt;
348
349         clk_enable(rtc_clk);
350         if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
351                 ticnt = readw(s3c_rtc_base + S3C2410_RTCCON);
352                 ticnt &= S3C64XX_RTCCON_TICEN;
353         } else {
354                 ticnt = readb(s3c_rtc_base + S3C2410_TICNT);
355                 ticnt &= S3C2410_TICNT_ENABLE;
356         }
357
358         seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt  ? "yes" : "no");
359         clk_disable(rtc_clk);
360         return 0;
361 }
362
363 static const struct rtc_class_ops s3c_rtcops = {
364         .read_time      = s3c_rtc_gettime,
365         .set_time       = s3c_rtc_settime,
366         .read_alarm     = s3c_rtc_getalarm,
367         .set_alarm      = s3c_rtc_setalarm,
368         .proc           = s3c_rtc_proc,
369         .alarm_irq_enable = s3c_rtc_setaie,
370 };
371
372 static void s3c_rtc_enable(struct platform_device *pdev, int en)
373 {
374         void __iomem *base = s3c_rtc_base;
375         unsigned int tmp;
376
377         if (s3c_rtc_base == NULL)
378                 return;
379
380         clk_enable(rtc_clk);
381         if (!en) {
382                 tmp = readw(base + S3C2410_RTCCON);
383                 if (s3c_rtc_cpu_type == TYPE_S3C64XX)
384                         tmp &= ~S3C64XX_RTCCON_TICEN;
385                 tmp &= ~S3C2410_RTCCON_RTCEN;
386                 writew(tmp, base + S3C2410_RTCCON);
387
388                 if (s3c_rtc_cpu_type != TYPE_S3C64XX) {
389                         tmp = readb(base + S3C2410_TICNT);
390                         tmp &= ~S3C2410_TICNT_ENABLE;
391                         writeb(tmp, base + S3C2410_TICNT);
392                 }
393         } else {
394                 /* re-enable the device, and check it is ok */
395
396                 if ((readw(base+S3C2410_RTCCON) & S3C2410_RTCCON_RTCEN) == 0) {
397                         dev_info(&pdev->dev, "rtc disabled, re-enabling\n");
398
399                         tmp = readw(base + S3C2410_RTCCON);
400                         writew(tmp | S3C2410_RTCCON_RTCEN,
401                                 base + S3C2410_RTCCON);
402                 }
403
404                 if ((readw(base + S3C2410_RTCCON) & S3C2410_RTCCON_CNTSEL)) {
405                         dev_info(&pdev->dev, "removing RTCCON_CNTSEL\n");
406
407                         tmp = readw(base + S3C2410_RTCCON);
408                         writew(tmp & ~S3C2410_RTCCON_CNTSEL,
409                                 base + S3C2410_RTCCON);
410                 }
411
412                 if ((readw(base + S3C2410_RTCCON) & S3C2410_RTCCON_CLKRST)) {
413                         dev_info(&pdev->dev, "removing RTCCON_CLKRST\n");
414
415                         tmp = readw(base + S3C2410_RTCCON);
416                         writew(tmp & ~S3C2410_RTCCON_CLKRST,
417                                 base + S3C2410_RTCCON);
418                 }
419         }
420         clk_disable(rtc_clk);
421 }
422
423 static int s3c_rtc_remove(struct platform_device *dev)
424 {
425         platform_set_drvdata(dev, NULL);
426
427         s3c_rtc_setaie(&dev->dev, 0);
428
429         clk_unprepare(rtc_clk);
430         rtc_clk = NULL;
431
432         return 0;
433 }
434
435 static const struct of_device_id s3c_rtc_dt_match[];
436
437 static inline int s3c_rtc_get_driver_data(struct platform_device *pdev)
438 {
439 #ifdef CONFIG_OF
440         struct s3c_rtc_drv_data *data;
441         if (pdev->dev.of_node) {
442                 const struct of_device_id *match;
443                 match = of_match_node(s3c_rtc_dt_match, pdev->dev.of_node);
444                 data = (struct s3c_rtc_drv_data *) match->data;
445                 return data->cpu_type;
446         }
447 #endif
448         return platform_get_device_id(pdev)->driver_data;
449 }
450
451 static int s3c_rtc_probe(struct platform_device *pdev)
452 {
453         struct rtc_device *rtc;
454         struct rtc_time rtc_tm;
455         struct resource *res;
456         int ret;
457         int tmp;
458
459         dev_dbg(&pdev->dev, "%s: probe=%p\n", __func__, pdev);
460
461         /* find the IRQs */
462
463         s3c_rtc_tickno = platform_get_irq(pdev, 1);
464         if (s3c_rtc_tickno < 0) {
465                 dev_err(&pdev->dev, "no irq for rtc tick\n");
466                 return s3c_rtc_tickno;
467         }
468
469         s3c_rtc_alarmno = platform_get_irq(pdev, 0);
470         if (s3c_rtc_alarmno < 0) {
471                 dev_err(&pdev->dev, "no irq for alarm\n");
472                 return s3c_rtc_alarmno;
473         }
474
475         dev_dbg(&pdev->dev, "s3c2410_rtc: tick irq %d, alarm irq %d\n",
476                  s3c_rtc_tickno, s3c_rtc_alarmno);
477
478         /* get the memory region */
479
480         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
481         if (res == NULL) {
482                 dev_err(&pdev->dev, "failed to get memory region resource\n");
483                 return -ENOENT;
484         }
485
486         s3c_rtc_base = devm_ioremap_resource(&pdev->dev, res);
487         if (IS_ERR(s3c_rtc_base))
488                 return PTR_ERR(s3c_rtc_base);
489
490         rtc_clk = devm_clk_get(&pdev->dev, "rtc");
491         if (IS_ERR(rtc_clk)) {
492                 dev_err(&pdev->dev, "failed to find rtc clock source\n");
493                 ret = PTR_ERR(rtc_clk);
494                 rtc_clk = NULL;
495                 return ret;
496         }
497
498         clk_prepare_enable(rtc_clk);
499
500         /* check to see if everything is setup correctly */
501
502         s3c_rtc_enable(pdev, 1);
503
504         dev_dbg(&pdev->dev, "s3c2410_rtc: RTCCON=%02x\n",
505                  readw(s3c_rtc_base + S3C2410_RTCCON));
506
507         device_init_wakeup(&pdev->dev, 1);
508
509         /* register RTC and exit */
510
511         rtc = devm_rtc_device_register(&pdev->dev, "s3c", &s3c_rtcops,
512                                   THIS_MODULE);
513
514         if (IS_ERR(rtc)) {
515                 dev_err(&pdev->dev, "cannot attach rtc\n");
516                 ret = PTR_ERR(rtc);
517                 goto err_nortc;
518         }
519
520         s3c_rtc_cpu_type = s3c_rtc_get_driver_data(pdev);
521
522         /* Check RTC Time */
523
524         s3c_rtc_gettime(NULL, &rtc_tm);
525
526         if (rtc_valid_tm(&rtc_tm)) {
527                 rtc_tm.tm_year  = 100;
528                 rtc_tm.tm_mon   = 0;
529                 rtc_tm.tm_mday  = 1;
530                 rtc_tm.tm_hour  = 0;
531                 rtc_tm.tm_min   = 0;
532                 rtc_tm.tm_sec   = 0;
533
534                 s3c_rtc_settime(NULL, &rtc_tm);
535
536                 dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n");
537         }
538
539         if (s3c_rtc_cpu_type != TYPE_S3C2410)
540                 rtc->max_user_freq = 32768;
541         else
542                 rtc->max_user_freq = 128;
543
544         if (s3c_rtc_cpu_type == TYPE_S3C2416 || s3c_rtc_cpu_type == TYPE_S3C2443) {
545                 tmp = readw(s3c_rtc_base + S3C2410_RTCCON);
546                 tmp |= S3C2443_RTCCON_TICSEL;
547                 writew(tmp, s3c_rtc_base + S3C2410_RTCCON);
548         }
549
550         platform_set_drvdata(pdev, rtc);
551
552         s3c_rtc_setfreq(&pdev->dev, 1);
553
554         ret = devm_request_irq(&pdev->dev, s3c_rtc_alarmno, s3c_rtc_alarmirq,
555                           0,  "s3c2410-rtc alarm", rtc);
556         if (ret) {
557                 dev_err(&pdev->dev, "IRQ%d error %d\n", s3c_rtc_alarmno, ret);
558                 goto err_alarm_irq;
559         }
560
561         ret = devm_request_irq(&pdev->dev, s3c_rtc_tickno, s3c_rtc_tickirq,
562                           0,  "s3c2410-rtc tick", rtc);
563         if (ret) {
564                 dev_err(&pdev->dev, "IRQ%d error %d\n", s3c_rtc_tickno, ret);
565                 goto err_alarm_irq;
566         }
567
568         clk_disable(rtc_clk);
569
570         return 0;
571
572  err_alarm_irq:
573         platform_set_drvdata(pdev, NULL);
574
575  err_nortc:
576         s3c_rtc_enable(pdev, 0);
577         clk_disable_unprepare(rtc_clk);
578
579         return ret;
580 }
581
582 #ifdef CONFIG_PM_SLEEP
583 /* RTC Power management control */
584
585 static int ticnt_save, ticnt_en_save;
586 static bool wake_en;
587
588 static int s3c_rtc_suspend(struct device *dev)
589 {
590         struct platform_device *pdev = to_platform_device(dev);
591
592         clk_enable(rtc_clk);
593         /* save TICNT for anyone using periodic interrupts */
594         ticnt_save = readb(s3c_rtc_base + S3C2410_TICNT);
595         if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
596                 ticnt_en_save = readw(s3c_rtc_base + S3C2410_RTCCON);
597                 ticnt_en_save &= S3C64XX_RTCCON_TICEN;
598         }
599         s3c_rtc_enable(pdev, 0);
600
601         if (device_may_wakeup(dev) && !wake_en) {
602                 if (enable_irq_wake(s3c_rtc_alarmno) == 0)
603                         wake_en = true;
604                 else
605                         dev_err(dev, "enable_irq_wake failed\n");
606         }
607         clk_disable(rtc_clk);
608
609         return 0;
610 }
611
612 static int s3c_rtc_resume(struct device *dev)
613 {
614         struct platform_device *pdev = to_platform_device(dev);
615         unsigned int tmp;
616
617         clk_enable(rtc_clk);
618         s3c_rtc_enable(pdev, 1);
619         writeb(ticnt_save, s3c_rtc_base + S3C2410_TICNT);
620         if (s3c_rtc_cpu_type == TYPE_S3C64XX && ticnt_en_save) {
621                 tmp = readw(s3c_rtc_base + S3C2410_RTCCON);
622                 writew(tmp | ticnt_en_save, s3c_rtc_base + S3C2410_RTCCON);
623         }
624
625         if (device_may_wakeup(dev) && wake_en) {
626                 disable_irq_wake(s3c_rtc_alarmno);
627                 wake_en = false;
628         }
629         clk_disable(rtc_clk);
630
631         return 0;
632 }
633 #endif
634
635 static SIMPLE_DEV_PM_OPS(s3c_rtc_pm_ops, s3c_rtc_suspend, s3c_rtc_resume);
636
637 #ifdef CONFIG_OF
638 static struct s3c_rtc_drv_data s3c_rtc_drv_data_array[] = {
639         [TYPE_S3C2410] = { TYPE_S3C2410 },
640         [TYPE_S3C2416] = { TYPE_S3C2416 },
641         [TYPE_S3C2443] = { TYPE_S3C2443 },
642         [TYPE_S3C64XX] = { TYPE_S3C64XX },
643 };
644
645 static const struct of_device_id s3c_rtc_dt_match[] = {
646         {
647                 .compatible = "samsung,s3c2410-rtc",
648                 .data = &s3c_rtc_drv_data_array[TYPE_S3C2410],
649         }, {
650                 .compatible = "samsung,s3c2416-rtc",
651                 .data = &s3c_rtc_drv_data_array[TYPE_S3C2416],
652         }, {
653                 .compatible = "samsung,s3c2443-rtc",
654                 .data = &s3c_rtc_drv_data_array[TYPE_S3C2443],
655         }, {
656                 .compatible = "samsung,s3c6410-rtc",
657                 .data = &s3c_rtc_drv_data_array[TYPE_S3C64XX],
658         },
659         {},
660 };
661 MODULE_DEVICE_TABLE(of, s3c_rtc_dt_match);
662 #endif
663
664 static struct platform_device_id s3c_rtc_driver_ids[] = {
665         {
666                 .name           = "s3c2410-rtc",
667                 .driver_data    = TYPE_S3C2410,
668         }, {
669                 .name           = "s3c2416-rtc",
670                 .driver_data    = TYPE_S3C2416,
671         }, {
672                 .name           = "s3c2443-rtc",
673                 .driver_data    = TYPE_S3C2443,
674         }, {
675                 .name           = "s3c64xx-rtc",
676                 .driver_data    = TYPE_S3C64XX,
677         },
678         { }
679 };
680
681 MODULE_DEVICE_TABLE(platform, s3c_rtc_driver_ids);
682
683 static struct platform_driver s3c_rtc_driver = {
684         .probe          = s3c_rtc_probe,
685         .remove         = s3c_rtc_remove,
686         .id_table       = s3c_rtc_driver_ids,
687         .driver         = {
688                 .name   = "s3c-rtc",
689                 .owner  = THIS_MODULE,
690                 .pm     = &s3c_rtc_pm_ops,
691                 .of_match_table = of_match_ptr(s3c_rtc_dt_match),
692         },
693 };
694
695 module_platform_driver(s3c_rtc_driver);
696
697 MODULE_DESCRIPTION("Samsung S3C RTC Driver");
698 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
699 MODULE_LICENSE("GPL");
700 MODULE_ALIAS("platform:s3c2410-rtc");