c543f6f1eec2f8d75500d8c77317ed2fcd3136f7
[linux-2.6.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
30 #include <mach/hardware.h>
31 #include <asm/uaccess.h>
32 #include <asm/io.h>
33 #include <asm/irq.h>
34 #include <plat/regs-rtc.h>
35
36 enum s3c_cpu_type {
37         TYPE_S3C2410,
38         TYPE_S3C64XX,
39 };
40
41 /* I have yet to find an S3C implementation with more than one
42  * of these rtc blocks in */
43
44 static struct resource *s3c_rtc_mem;
45
46 static struct clk *rtc_clk;
47 static void __iomem *s3c_rtc_base;
48 static int s3c_rtc_alarmno = NO_IRQ;
49 static int s3c_rtc_tickno  = NO_IRQ;
50 static bool wake_en;
51 static enum s3c_cpu_type s3c_rtc_cpu_type;
52
53 static DEFINE_SPINLOCK(s3c_rtc_pie_lock);
54
55 static void s3c_rtc_alarm_clk_enable(bool enable)
56 {
57         static DEFINE_SPINLOCK(s3c_rtc_alarm_clk_lock);
58         static bool alarm_clk_enabled;
59         unsigned long irq_flags;
60
61         spin_lock_irqsave(&s3c_rtc_alarm_clk_lock, irq_flags);
62         if (enable) {
63                 if (!alarm_clk_enabled) {
64                         clk_enable(rtc_clk);
65                         alarm_clk_enabled = true;
66                 }
67         } else {
68                 if (alarm_clk_enabled) {
69                         clk_disable(rtc_clk);
70                         alarm_clk_enabled = false;
71                 }
72         }
73         spin_unlock_irqrestore(&s3c_rtc_alarm_clk_lock, irq_flags);
74 }
75
76 /* IRQ Handlers */
77
78 static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)
79 {
80         struct rtc_device *rdev = id;
81
82         clk_enable(rtc_clk);
83         rtc_update_irq(rdev, 1, RTC_AF | RTC_IRQF);
84
85         if (s3c_rtc_cpu_type == TYPE_S3C64XX)
86                 writeb(S3C2410_INTP_ALM, s3c_rtc_base + S3C2410_INTP);
87
88         clk_disable(rtc_clk);
89
90         s3c_rtc_alarm_clk_enable(false);
91
92         return IRQ_HANDLED;
93 }
94
95 static irqreturn_t s3c_rtc_tickirq(int irq, void *id)
96 {
97         struct rtc_device *rdev = id;
98
99         clk_enable(rtc_clk);
100         rtc_update_irq(rdev, 1, RTC_PF | RTC_IRQF);
101
102         if (s3c_rtc_cpu_type == TYPE_S3C64XX)
103                 writeb(S3C2410_INTP_TIC, s3c_rtc_base + S3C2410_INTP);
104
105         clk_disable(rtc_clk);
106         return IRQ_HANDLED;
107 }
108
109 /* Update control registers */
110 static int s3c_rtc_setaie(struct device *dev, unsigned int enabled)
111 {
112         unsigned int tmp;
113
114         pr_debug("%s: aie=%d\n", __func__, enabled);
115
116         clk_enable(rtc_clk);
117         tmp = readb(s3c_rtc_base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
118
119         if (enabled)
120                 tmp |= S3C2410_RTCALM_ALMEN;
121
122         writeb(tmp, s3c_rtc_base + S3C2410_RTCALM);
123         clk_disable(rtc_clk);
124
125         s3c_rtc_alarm_clk_enable(enabled);
126
127         return 0;
128 }
129
130 static int s3c_rtc_setfreq(struct device *dev, int freq)
131 {
132         struct platform_device *pdev = to_platform_device(dev);
133         struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
134         unsigned int tmp = 0;
135
136         if (!is_power_of_2(freq))
137                 return -EINVAL;
138
139         clk_enable(rtc_clk);
140         spin_lock_irq(&s3c_rtc_pie_lock);
141
142         if (s3c_rtc_cpu_type == TYPE_S3C2410) {
143                 tmp = readb(s3c_rtc_base + S3C2410_TICNT);
144                 tmp &= S3C2410_TICNT_ENABLE;
145         }
146
147         tmp |= (rtc_dev->max_user_freq / freq)-1;
148
149         writel(tmp, s3c_rtc_base + S3C2410_TICNT);
150         spin_unlock_irq(&s3c_rtc_pie_lock);
151         clk_disable(rtc_clk);
152
153         return 0;
154 }
155
156 /* Time read/write */
157
158 static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
159 {
160         unsigned int have_retried = 0;
161         void __iomem *base = s3c_rtc_base;
162
163         clk_enable(rtc_clk);
164  retry_get_time:
165         rtc_tm->tm_min  = readb(base + S3C2410_RTCMIN);
166         rtc_tm->tm_hour = readb(base + S3C2410_RTCHOUR);
167         rtc_tm->tm_mday = readb(base + S3C2410_RTCDATE);
168         rtc_tm->tm_mon  = readb(base + S3C2410_RTCMON);
169         rtc_tm->tm_year = readb(base + S3C2410_RTCYEAR);
170         rtc_tm->tm_sec  = readb(base + S3C2410_RTCSEC);
171
172         /* the only way to work out wether the system was mid-update
173          * when we read it is to check the second counter, and if it
174          * is zero, then we re-try the entire read
175          */
176
177         if (rtc_tm->tm_sec == 0 && !have_retried) {
178                 have_retried = 1;
179                 goto retry_get_time;
180         }
181
182         rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
183         rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
184         rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
185         rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
186         rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
187         rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);
188
189         rtc_tm->tm_year += 100;
190
191         pr_debug("read time %04d.%02d.%02d %02d:%02d:%02d\n",
192                  1900 + rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday,
193                  rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);
194
195         rtc_tm->tm_mon -= 1;
196
197         clk_disable(rtc_clk);
198         return rtc_valid_tm(rtc_tm);
199 }
200
201 static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
202 {
203         void __iomem *base = s3c_rtc_base;
204         int year = tm->tm_year - 100;
205
206         pr_debug("set time %04d.%02d.%02d %02d:%02d:%02d\n",
207                  1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
208                  tm->tm_hour, tm->tm_min, tm->tm_sec);
209
210         /* we get around y2k by simply not supporting it */
211
212         if (year < 0 || year >= 100) {
213                 dev_err(dev, "rtc only supports 100 years\n");
214                 return -EINVAL;
215         }
216
217         clk_enable(rtc_clk);
218         writeb(bin2bcd(tm->tm_sec),  base + S3C2410_RTCSEC);
219         writeb(bin2bcd(tm->tm_min),  base + S3C2410_RTCMIN);
220         writeb(bin2bcd(tm->tm_hour), base + S3C2410_RTCHOUR);
221         writeb(bin2bcd(tm->tm_mday), base + S3C2410_RTCDATE);
222         writeb(bin2bcd(tm->tm_mon + 1), base + S3C2410_RTCMON);
223         writeb(bin2bcd(year), base + S3C2410_RTCYEAR);
224         clk_disable(rtc_clk);
225
226         return 0;
227 }
228
229 static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
230 {
231         struct rtc_time *alm_tm = &alrm->time;
232         void __iomem *base = s3c_rtc_base;
233         unsigned int alm_en;
234
235         clk_enable(rtc_clk);
236         alm_tm->tm_sec  = readb(base + S3C2410_ALMSEC);
237         alm_tm->tm_min  = readb(base + S3C2410_ALMMIN);
238         alm_tm->tm_hour = readb(base + S3C2410_ALMHOUR);
239         alm_tm->tm_mon  = readb(base + S3C2410_ALMMON);
240         alm_tm->tm_mday = readb(base + S3C2410_ALMDATE);
241         alm_tm->tm_year = readb(base + S3C2410_ALMYEAR);
242
243         alm_en = readb(base + S3C2410_RTCALM);
244
245         alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0;
246
247         pr_debug("read alarm %d, %04d.%02d.%02d %02d:%02d:%02d\n",
248                  alm_en,
249                  1900 + alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday,
250                  alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec);
251
252
253         /* decode the alarm enable field */
254
255         if (alm_en & S3C2410_RTCALM_SECEN)
256                 alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec);
257         else
258                 alm_tm->tm_sec = -1;
259
260         if (alm_en & S3C2410_RTCALM_MINEN)
261                 alm_tm->tm_min = bcd2bin(alm_tm->tm_min);
262         else
263                 alm_tm->tm_min = -1;
264
265         if (alm_en & S3C2410_RTCALM_HOUREN)
266                 alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour);
267         else
268                 alm_tm->tm_hour = -1;
269
270         if (alm_en & S3C2410_RTCALM_DAYEN)
271                 alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday);
272         else
273                 alm_tm->tm_mday = -1;
274
275         if (alm_en & S3C2410_RTCALM_MONEN) {
276                 alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon);
277                 alm_tm->tm_mon -= 1;
278         } else {
279                 alm_tm->tm_mon = -1;
280         }
281
282         if (alm_en & S3C2410_RTCALM_YEAREN)
283                 alm_tm->tm_year = bcd2bin(alm_tm->tm_year);
284         else
285                 alm_tm->tm_year = -1;
286
287         clk_disable(rtc_clk);
288         return 0;
289 }
290
291 static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
292 {
293         struct rtc_time *tm = &alrm->time;
294         void __iomem *base = s3c_rtc_base;
295         unsigned int alrm_en;
296
297         clk_enable(rtc_clk);
298         pr_debug("s3c_rtc_setalarm: %d, %04d.%02d.%02d %02d:%02d:%02d\n",
299                  alrm->enabled,
300                  1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday,
301                  tm->tm_hour, tm->tm_min, tm->tm_sec);
302
303         alrm_en = readb(base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
304         writeb(0x00, base + S3C2410_RTCALM);
305
306         if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
307                 alrm_en |= S3C2410_RTCALM_SECEN;
308                 writeb(bin2bcd(tm->tm_sec), base + S3C2410_ALMSEC);
309         }
310
311         if (tm->tm_min < 60 && tm->tm_min >= 0) {
312                 alrm_en |= S3C2410_RTCALM_MINEN;
313                 writeb(bin2bcd(tm->tm_min), base + S3C2410_ALMMIN);
314         }
315
316         if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
317                 alrm_en |= S3C2410_RTCALM_HOUREN;
318                 writeb(bin2bcd(tm->tm_hour), base + S3C2410_ALMHOUR);
319         }
320
321         pr_debug("setting S3C2410_RTCALM to %08x\n", alrm_en);
322
323         writeb(alrm_en, base + S3C2410_RTCALM);
324
325         s3c_rtc_setaie(dev, alrm->enabled);
326
327         clk_disable(rtc_clk);
328         return 0;
329 }
330
331 static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
332 {
333         unsigned int ticnt;
334
335         clk_enable(rtc_clk);
336         if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
337                 ticnt = readw(s3c_rtc_base + S3C2410_RTCCON);
338                 ticnt &= S3C64XX_RTCCON_TICEN;
339         } else {
340                 ticnt = readb(s3c_rtc_base + S3C2410_TICNT);
341                 ticnt &= S3C2410_TICNT_ENABLE;
342         }
343
344         seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt  ? "yes" : "no");
345         clk_disable(rtc_clk);
346         return 0;
347 }
348
349 static const struct rtc_class_ops s3c_rtcops = {
350         .read_time      = s3c_rtc_gettime,
351         .set_time       = s3c_rtc_settime,
352         .read_alarm     = s3c_rtc_getalarm,
353         .set_alarm      = s3c_rtc_setalarm,
354         .proc           = s3c_rtc_proc,
355         .alarm_irq_enable = s3c_rtc_setaie,
356 };
357
358 static void s3c_rtc_enable(struct platform_device *pdev, int en)
359 {
360         void __iomem *base = s3c_rtc_base;
361         unsigned int tmp;
362
363         if (s3c_rtc_base == NULL)
364                 return;
365
366         clk_enable(rtc_clk);
367         if (!en) {
368                 tmp = readw(base + S3C2410_RTCCON);
369                 if (s3c_rtc_cpu_type == TYPE_S3C64XX)
370                         tmp &= ~S3C64XX_RTCCON_TICEN;
371                 tmp &= ~S3C2410_RTCCON_RTCEN;
372                 writew(tmp, base + S3C2410_RTCCON);
373
374                 if (s3c_rtc_cpu_type == TYPE_S3C2410) {
375                         tmp = readb(base + S3C2410_TICNT);
376                         tmp &= ~S3C2410_TICNT_ENABLE;
377                         writeb(tmp, base + S3C2410_TICNT);
378                 }
379         } else {
380                 /* re-enable the device, and check it is ok */
381
382                 if ((readw(base+S3C2410_RTCCON) & S3C2410_RTCCON_RTCEN) == 0) {
383                         dev_info(&pdev->dev, "rtc disabled, re-enabling\n");
384
385                         tmp = readw(base + S3C2410_RTCCON);
386                         writew(tmp | S3C2410_RTCCON_RTCEN,
387                                 base + S3C2410_RTCCON);
388                 }
389
390                 if ((readw(base + S3C2410_RTCCON) & S3C2410_RTCCON_CNTSEL)) {
391                         dev_info(&pdev->dev, "removing RTCCON_CNTSEL\n");
392
393                         tmp = readw(base + S3C2410_RTCCON);
394                         writew(tmp & ~S3C2410_RTCCON_CNTSEL,
395                                 base + S3C2410_RTCCON);
396                 }
397
398                 if ((readw(base + S3C2410_RTCCON) & S3C2410_RTCCON_CLKRST)) {
399                         dev_info(&pdev->dev, "removing RTCCON_CLKRST\n");
400
401                         tmp = readw(base + S3C2410_RTCCON);
402                         writew(tmp & ~S3C2410_RTCCON_CLKRST,
403                                 base + S3C2410_RTCCON);
404                 }
405         }
406         clk_disable(rtc_clk);
407 }
408
409 static int __devexit s3c_rtc_remove(struct platform_device *dev)
410 {
411         struct rtc_device *rtc = platform_get_drvdata(dev);
412
413         free_irq(s3c_rtc_alarmno, rtc);
414         free_irq(s3c_rtc_tickno, rtc);
415
416         platform_set_drvdata(dev, NULL);
417         rtc_device_unregister(rtc);
418
419         s3c_rtc_setaie(&dev->dev, 0);
420
421         clk_put(rtc_clk);
422         rtc_clk = NULL;
423
424         iounmap(s3c_rtc_base);
425         release_resource(s3c_rtc_mem);
426         kfree(s3c_rtc_mem);
427
428         return 0;
429 }
430
431 static int __devinit s3c_rtc_probe(struct platform_device *pdev)
432 {
433         struct rtc_device *rtc;
434         struct rtc_time rtc_tm;
435         struct resource *res;
436         int ret;
437
438         pr_debug("%s: probe=%p\n", __func__, pdev);
439
440         /* find the IRQs */
441
442         s3c_rtc_tickno = platform_get_irq(pdev, 1);
443         if (s3c_rtc_tickno < 0) {
444                 dev_err(&pdev->dev, "no irq for rtc tick\n");
445                 return -ENOENT;
446         }
447
448         s3c_rtc_alarmno = platform_get_irq(pdev, 0);
449         if (s3c_rtc_alarmno < 0) {
450                 dev_err(&pdev->dev, "no irq for alarm\n");
451                 return -ENOENT;
452         }
453
454         pr_debug("s3c2410_rtc: tick irq %d, alarm irq %d\n",
455                  s3c_rtc_tickno, s3c_rtc_alarmno);
456
457         /* get the memory region */
458
459         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
460         if (res == NULL) {
461                 dev_err(&pdev->dev, "failed to get memory region resource\n");
462                 return -ENOENT;
463         }
464
465         s3c_rtc_mem = request_mem_region(res->start, resource_size(res),
466                                          pdev->name);
467
468         if (s3c_rtc_mem == NULL) {
469                 dev_err(&pdev->dev, "failed to reserve memory region\n");
470                 ret = -ENOENT;
471                 goto err_nores;
472         }
473
474         s3c_rtc_base = ioremap(res->start, resource_size(res));
475         if (s3c_rtc_base == NULL) {
476                 dev_err(&pdev->dev, "failed ioremap()\n");
477                 ret = -EINVAL;
478                 goto err_nomap;
479         }
480
481         rtc_clk = clk_get(&pdev->dev, "rtc");
482         if (IS_ERR(rtc_clk)) {
483                 dev_err(&pdev->dev, "failed to find rtc clock source\n");
484                 ret = PTR_ERR(rtc_clk);
485                 rtc_clk = NULL;
486                 goto err_clk;
487         }
488
489         clk_enable(rtc_clk);
490
491         /* check to see if everything is setup correctly */
492
493         s3c_rtc_enable(pdev, 1);
494
495         pr_debug("s3c2410_rtc: RTCCON=%02x\n",
496                  readw(s3c_rtc_base + S3C2410_RTCCON));
497
498         device_init_wakeup(&pdev->dev, 1);
499
500         /* register RTC and exit */
501
502         rtc = rtc_device_register("s3c", &pdev->dev, &s3c_rtcops,
503                                   THIS_MODULE);
504
505         if (IS_ERR(rtc)) {
506                 dev_err(&pdev->dev, "cannot attach rtc\n");
507                 ret = PTR_ERR(rtc);
508                 goto err_nortc;
509         }
510
511 #ifdef CONFIG_OF
512         if (pdev->dev.of_node)
513                 s3c_rtc_cpu_type = of_device_is_compatible(pdev->dev.of_node,
514                         "samsung,s3c6410-rtc") ? TYPE_S3C64XX : TYPE_S3C2410;
515         else
516 #endif
517                 s3c_rtc_cpu_type = platform_get_device_id(pdev)->driver_data;
518
519         /* Check RTC Time */
520
521         s3c_rtc_gettime(NULL, &rtc_tm);
522
523         if (rtc_valid_tm(&rtc_tm)) {
524                 rtc_tm.tm_year  = 100;
525                 rtc_tm.tm_mon   = 0;
526                 rtc_tm.tm_mday  = 1;
527                 rtc_tm.tm_hour  = 0;
528                 rtc_tm.tm_min   = 0;
529                 rtc_tm.tm_sec   = 0;
530
531                 s3c_rtc_settime(NULL, &rtc_tm);
532
533                 dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n");
534         }
535
536         if (s3c_rtc_cpu_type == TYPE_S3C64XX)
537                 rtc->max_user_freq = 32768;
538         else
539                 rtc->max_user_freq = 128;
540
541         platform_set_drvdata(pdev, rtc);
542
543         s3c_rtc_setfreq(&pdev->dev, 1);
544
545         ret = request_irq(s3c_rtc_alarmno, s3c_rtc_alarmirq,
546                           0,  "s3c2410-rtc alarm", rtc);
547         if (ret) {
548                 dev_err(&pdev->dev, "IRQ%d error %d\n", s3c_rtc_alarmno, ret);
549                 goto err_alarm_irq;
550         }
551
552         ret = request_irq(s3c_rtc_tickno, s3c_rtc_tickirq,
553                           0,  "s3c2410-rtc tick", rtc);
554         if (ret) {
555                 dev_err(&pdev->dev, "IRQ%d error %d\n", s3c_rtc_tickno, ret);
556                 free_irq(s3c_rtc_alarmno, rtc);
557                 goto err_tick_irq;
558         }
559
560         clk_disable(rtc_clk);
561
562         return 0;
563
564  err_tick_irq:
565         free_irq(s3c_rtc_alarmno, rtc);
566
567  err_alarm_irq:
568         platform_set_drvdata(pdev, NULL);
569         rtc_device_unregister(rtc);
570
571  err_nortc:
572         s3c_rtc_enable(pdev, 0);
573         clk_disable(rtc_clk);
574         clk_put(rtc_clk);
575
576  err_clk:
577         iounmap(s3c_rtc_base);
578
579  err_nomap:
580         release_resource(s3c_rtc_mem);
581
582  err_nores:
583         return ret;
584 }
585
586 #ifdef CONFIG_PM
587
588 /* RTC Power management control */
589
590 static int ticnt_save, ticnt_en_save;
591
592 static int s3c_rtc_suspend(struct platform_device *pdev, pm_message_t state)
593 {
594         clk_enable(rtc_clk);
595         /* save TICNT for anyone using periodic interrupts */
596         ticnt_save = readb(s3c_rtc_base + S3C2410_TICNT);
597         if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
598                 ticnt_en_save = readw(s3c_rtc_base + S3C2410_RTCCON);
599                 ticnt_en_save &= S3C64XX_RTCCON_TICEN;
600         }
601         s3c_rtc_enable(pdev, 0);
602
603         if (device_may_wakeup(&pdev->dev) && !wake_en) {
604                 if (enable_irq_wake(s3c_rtc_alarmno) == 0)
605                         wake_en = true;
606                 else
607                         dev_err(&pdev->dev, "enable_irq_wake failed\n");
608         }
609         clk_disable(rtc_clk);
610
611         return 0;
612 }
613
614 static int s3c_rtc_resume(struct platform_device *pdev)
615 {
616         unsigned int tmp;
617
618         clk_enable(rtc_clk);
619         s3c_rtc_enable(pdev, 1);
620         writeb(ticnt_save, s3c_rtc_base + S3C2410_TICNT);
621         if (s3c_rtc_cpu_type == TYPE_S3C64XX && ticnt_en_save) {
622                 tmp = readw(s3c_rtc_base + S3C2410_RTCCON);
623                 writew(tmp | ticnt_en_save, s3c_rtc_base + S3C2410_RTCCON);
624         }
625
626         if (device_may_wakeup(&pdev->dev) && wake_en) {
627                 disable_irq_wake(s3c_rtc_alarmno);
628                 wake_en = false;
629         }
630         clk_disable(rtc_clk);
631
632         return 0;
633 }
634 #else
635 #define s3c_rtc_suspend NULL
636 #define s3c_rtc_resume  NULL
637 #endif
638
639 #ifdef CONFIG_OF
640 static const struct of_device_id s3c_rtc_dt_match[] = {
641         { .compatible = "samsung,s3c2410-rtc" },
642         { .compatible = "samsung,s3c6410-rtc" },
643         {},
644 };
645 MODULE_DEVICE_TABLE(of, s3c_rtc_dt_match);
646 #else
647 #define s3c_rtc_dt_match NULL
648 #endif
649
650 static struct platform_device_id s3c_rtc_driver_ids[] = {
651         {
652                 .name           = "s3c2410-rtc",
653                 .driver_data    = TYPE_S3C2410,
654         }, {
655                 .name           = "s3c64xx-rtc",
656                 .driver_data    = TYPE_S3C64XX,
657         },
658         { }
659 };
660
661 MODULE_DEVICE_TABLE(platform, s3c_rtc_driver_ids);
662
663 static struct platform_driver s3c_rtc_driver = {
664         .probe          = s3c_rtc_probe,
665         .remove         = __devexit_p(s3c_rtc_remove),
666         .suspend        = s3c_rtc_suspend,
667         .resume         = s3c_rtc_resume,
668         .id_table       = s3c_rtc_driver_ids,
669         .driver         = {
670                 .name   = "s3c-rtc",
671                 .owner  = THIS_MODULE,
672                 .of_match_table = s3c_rtc_dt_match,
673         },
674 };
675
676 module_platform_driver(s3c_rtc_driver);
677
678 MODULE_DESCRIPTION("Samsung S3C RTC Driver");
679 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
680 MODULE_LICENSE("GPL");
681 MODULE_ALIAS("platform:s3c2410-rtc");