Merge branch 'core' of git://git.kernel.org/pub/scm/linux/kernel/git/rric/oprofile...
[pandora-kernel.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
29 #include <mach/hardware.h>
30 #include <asm/uaccess.h>
31 #include <asm/io.h>
32 #include <asm/irq.h>
33 #include <plat/regs-rtc.h>
34
35 enum s3c_cpu_type {
36         TYPE_S3C2410,
37         TYPE_S3C64XX,
38 };
39
40 /* I have yet to find an S3C implementation with more than one
41  * of these rtc blocks in */
42
43 static struct resource *s3c_rtc_mem;
44
45 static struct clk *rtc_clk;
46 static void __iomem *s3c_rtc_base;
47 static int s3c_rtc_alarmno = NO_IRQ;
48 static int s3c_rtc_tickno  = NO_IRQ;
49 static enum s3c_cpu_type s3c_rtc_cpu_type;
50
51 static DEFINE_SPINLOCK(s3c_rtc_pie_lock);
52
53 /* IRQ Handlers */
54
55 static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)
56 {
57         struct rtc_device *rdev = id;
58
59         rtc_update_irq(rdev, 1, RTC_AF | RTC_IRQF);
60
61         if (s3c_rtc_cpu_type == TYPE_S3C64XX)
62                 writeb(S3C2410_INTP_ALM, s3c_rtc_base + S3C2410_INTP);
63
64         return IRQ_HANDLED;
65 }
66
67 static irqreturn_t s3c_rtc_tickirq(int irq, void *id)
68 {
69         struct rtc_device *rdev = id;
70
71         rtc_update_irq(rdev, 1, RTC_PF | RTC_IRQF);
72
73         if (s3c_rtc_cpu_type == TYPE_S3C64XX)
74                 writeb(S3C2410_INTP_TIC, s3c_rtc_base + S3C2410_INTP);
75
76         return IRQ_HANDLED;
77 }
78
79 /* Update control registers */
80 static int s3c_rtc_setaie(struct device *dev, unsigned int enabled)
81 {
82         unsigned int tmp;
83
84         pr_debug("%s: aie=%d\n", __func__, enabled);
85
86         tmp = readb(s3c_rtc_base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
87
88         if (enabled)
89                 tmp |= S3C2410_RTCALM_ALMEN;
90
91         writeb(tmp, s3c_rtc_base + S3C2410_RTCALM);
92
93         return 0;
94 }
95
96 static int s3c_rtc_setfreq(struct device *dev, int freq)
97 {
98         struct platform_device *pdev = to_platform_device(dev);
99         struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
100         unsigned int tmp = 0;
101
102         if (!is_power_of_2(freq))
103                 return -EINVAL;
104
105         spin_lock_irq(&s3c_rtc_pie_lock);
106
107         if (s3c_rtc_cpu_type == TYPE_S3C2410) {
108                 tmp = readb(s3c_rtc_base + S3C2410_TICNT);
109                 tmp &= S3C2410_TICNT_ENABLE;
110         }
111
112         tmp |= (rtc_dev->max_user_freq / freq)-1;
113
114         writel(tmp, s3c_rtc_base + S3C2410_TICNT);
115         spin_unlock_irq(&s3c_rtc_pie_lock);
116
117         return 0;
118 }
119
120 /* Time read/write */
121
122 static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
123 {
124         unsigned int have_retried = 0;
125         void __iomem *base = s3c_rtc_base;
126
127  retry_get_time:
128         rtc_tm->tm_min  = readb(base + S3C2410_RTCMIN);
129         rtc_tm->tm_hour = readb(base + S3C2410_RTCHOUR);
130         rtc_tm->tm_mday = readb(base + S3C2410_RTCDATE);
131         rtc_tm->tm_mon  = readb(base + S3C2410_RTCMON);
132         rtc_tm->tm_year = readb(base + S3C2410_RTCYEAR);
133         rtc_tm->tm_sec  = readb(base + S3C2410_RTCSEC);
134
135         /* the only way to work out wether the system was mid-update
136          * when we read it is to check the second counter, and if it
137          * is zero, then we re-try the entire read
138          */
139
140         if (rtc_tm->tm_sec == 0 && !have_retried) {
141                 have_retried = 1;
142                 goto retry_get_time;
143         }
144
145         pr_debug("read time %04d.%02d.%02d %02d:%02d:%02d\n",
146                  1900 + rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday,
147                  rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);
148
149         rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
150         rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
151         rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
152         rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
153         rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
154         rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);
155
156         rtc_tm->tm_year += 100;
157         rtc_tm->tm_mon -= 1;
158
159         return rtc_valid_tm(rtc_tm);
160 }
161
162 static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
163 {
164         void __iomem *base = s3c_rtc_base;
165         int year = tm->tm_year - 100;
166
167         pr_debug("set time %04d.%02d.%02d %02d:%02d:%02d\n",
168                  1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
169                  tm->tm_hour, tm->tm_min, tm->tm_sec);
170
171         /* we get around y2k by simply not supporting it */
172
173         if (year < 0 || year >= 100) {
174                 dev_err(dev, "rtc only supports 100 years\n");
175                 return -EINVAL;
176         }
177
178         writeb(bin2bcd(tm->tm_sec),  base + S3C2410_RTCSEC);
179         writeb(bin2bcd(tm->tm_min),  base + S3C2410_RTCMIN);
180         writeb(bin2bcd(tm->tm_hour), base + S3C2410_RTCHOUR);
181         writeb(bin2bcd(tm->tm_mday), base + S3C2410_RTCDATE);
182         writeb(bin2bcd(tm->tm_mon + 1), base + S3C2410_RTCMON);
183         writeb(bin2bcd(year), base + S3C2410_RTCYEAR);
184
185         return 0;
186 }
187
188 static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
189 {
190         struct rtc_time *alm_tm = &alrm->time;
191         void __iomem *base = s3c_rtc_base;
192         unsigned int alm_en;
193
194         alm_tm->tm_sec  = readb(base + S3C2410_ALMSEC);
195         alm_tm->tm_min  = readb(base + S3C2410_ALMMIN);
196         alm_tm->tm_hour = readb(base + S3C2410_ALMHOUR);
197         alm_tm->tm_mon  = readb(base + S3C2410_ALMMON);
198         alm_tm->tm_mday = readb(base + S3C2410_ALMDATE);
199         alm_tm->tm_year = readb(base + S3C2410_ALMYEAR);
200
201         alm_en = readb(base + S3C2410_RTCALM);
202
203         alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0;
204
205         pr_debug("read alarm %d, %04d.%02d.%02d %02d:%02d:%02d\n",
206                  alm_en,
207                  1900 + alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday,
208                  alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec);
209
210
211         /* decode the alarm enable field */
212
213         if (alm_en & S3C2410_RTCALM_SECEN)
214                 alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec);
215         else
216                 alm_tm->tm_sec = -1;
217
218         if (alm_en & S3C2410_RTCALM_MINEN)
219                 alm_tm->tm_min = bcd2bin(alm_tm->tm_min);
220         else
221                 alm_tm->tm_min = -1;
222
223         if (alm_en & S3C2410_RTCALM_HOUREN)
224                 alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour);
225         else
226                 alm_tm->tm_hour = -1;
227
228         if (alm_en & S3C2410_RTCALM_DAYEN)
229                 alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday);
230         else
231                 alm_tm->tm_mday = -1;
232
233         if (alm_en & S3C2410_RTCALM_MONEN) {
234                 alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon);
235                 alm_tm->tm_mon -= 1;
236         } else {
237                 alm_tm->tm_mon = -1;
238         }
239
240         if (alm_en & S3C2410_RTCALM_YEAREN)
241                 alm_tm->tm_year = bcd2bin(alm_tm->tm_year);
242         else
243                 alm_tm->tm_year = -1;
244
245         return 0;
246 }
247
248 static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
249 {
250         struct rtc_time *tm = &alrm->time;
251         void __iomem *base = s3c_rtc_base;
252         unsigned int alrm_en;
253
254         pr_debug("s3c_rtc_setalarm: %d, %04d.%02d.%02d %02d:%02d:%02d\n",
255                  alrm->enabled,
256                  1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
257                  tm->tm_hour, tm->tm_min, tm->tm_sec);
258
259
260         alrm_en = readb(base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
261         writeb(0x00, base + S3C2410_RTCALM);
262
263         if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
264                 alrm_en |= S3C2410_RTCALM_SECEN;
265                 writeb(bin2bcd(tm->tm_sec), base + S3C2410_ALMSEC);
266         }
267
268         if (tm->tm_min < 60 && tm->tm_min >= 0) {
269                 alrm_en |= S3C2410_RTCALM_MINEN;
270                 writeb(bin2bcd(tm->tm_min), base + S3C2410_ALMMIN);
271         }
272
273         if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
274                 alrm_en |= S3C2410_RTCALM_HOUREN;
275                 writeb(bin2bcd(tm->tm_hour), base + S3C2410_ALMHOUR);
276         }
277
278         pr_debug("setting S3C2410_RTCALM to %08x\n", alrm_en);
279
280         writeb(alrm_en, base + S3C2410_RTCALM);
281
282         s3c_rtc_setaie(dev, alrm->enabled);
283
284         return 0;
285 }
286
287 static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
288 {
289         unsigned int ticnt;
290
291         if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
292                 ticnt = readw(s3c_rtc_base + S3C2410_RTCCON);
293                 ticnt &= S3C64XX_RTCCON_TICEN;
294         } else {
295                 ticnt = readb(s3c_rtc_base + S3C2410_TICNT);
296                 ticnt &= S3C2410_TICNT_ENABLE;
297         }
298
299         seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt  ? "yes" : "no");
300         return 0;
301 }
302
303 static int s3c_rtc_open(struct device *dev)
304 {
305         struct platform_device *pdev = to_platform_device(dev);
306         struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
307         int ret;
308
309         ret = request_irq(s3c_rtc_alarmno, s3c_rtc_alarmirq,
310                           IRQF_DISABLED,  "s3c2410-rtc alarm", rtc_dev);
311
312         if (ret) {
313                 dev_err(dev, "IRQ%d error %d\n", s3c_rtc_alarmno, ret);
314                 return ret;
315         }
316
317         ret = request_irq(s3c_rtc_tickno, s3c_rtc_tickirq,
318                           IRQF_DISABLED,  "s3c2410-rtc tick", rtc_dev);
319
320         if (ret) {
321                 dev_err(dev, "IRQ%d error %d\n", s3c_rtc_tickno, ret);
322                 goto tick_err;
323         }
324
325         return ret;
326
327  tick_err:
328         free_irq(s3c_rtc_alarmno, rtc_dev);
329         return ret;
330 }
331
332 static void s3c_rtc_release(struct device *dev)
333 {
334         struct platform_device *pdev = to_platform_device(dev);
335         struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
336
337         /* do not clear AIE here, it may be needed for wake */
338
339         s3c_rtc_setpie(dev, 0);
340         free_irq(s3c_rtc_alarmno, rtc_dev);
341         free_irq(s3c_rtc_tickno, rtc_dev);
342 }
343
344 static const struct rtc_class_ops s3c_rtcops = {
345         .open           = s3c_rtc_open,
346         .release        = s3c_rtc_release,
347         .read_time      = s3c_rtc_gettime,
348         .set_time       = s3c_rtc_settime,
349         .read_alarm     = s3c_rtc_getalarm,
350         .set_alarm      = s3c_rtc_setalarm,
351         .proc           = s3c_rtc_proc,
352         .alarm_irq_enable = s3c_rtc_setaie,
353 };
354
355 static void s3c_rtc_enable(struct platform_device *pdev, int en)
356 {
357         void __iomem *base = s3c_rtc_base;
358         unsigned int tmp;
359
360         if (s3c_rtc_base == NULL)
361                 return;
362
363         if (!en) {
364                 tmp = readw(base + S3C2410_RTCCON);
365                 if (s3c_rtc_cpu_type == TYPE_S3C64XX)
366                         tmp &= ~S3C64XX_RTCCON_TICEN;
367                 tmp &= ~S3C2410_RTCCON_RTCEN;
368                 writew(tmp, base + S3C2410_RTCCON);
369
370                 if (s3c_rtc_cpu_type == TYPE_S3C2410) {
371                         tmp = readb(base + S3C2410_TICNT);
372                         tmp &= ~S3C2410_TICNT_ENABLE;
373                         writeb(tmp, base + S3C2410_TICNT);
374                 }
375         } else {
376                 /* re-enable the device, and check it is ok */
377
378                 if ((readw(base+S3C2410_RTCCON) & S3C2410_RTCCON_RTCEN) == 0) {
379                         dev_info(&pdev->dev, "rtc disabled, re-enabling\n");
380
381                         tmp = readw(base + S3C2410_RTCCON);
382                         writew(tmp | S3C2410_RTCCON_RTCEN,
383                                 base + S3C2410_RTCCON);
384                 }
385
386                 if ((readw(base + S3C2410_RTCCON) & S3C2410_RTCCON_CNTSEL)) {
387                         dev_info(&pdev->dev, "removing RTCCON_CNTSEL\n");
388
389                         tmp = readw(base + S3C2410_RTCCON);
390                         writew(tmp & ~S3C2410_RTCCON_CNTSEL,
391                                 base + S3C2410_RTCCON);
392                 }
393
394                 if ((readw(base + S3C2410_RTCCON) & S3C2410_RTCCON_CLKRST)) {
395                         dev_info(&pdev->dev, "removing RTCCON_CLKRST\n");
396
397                         tmp = readw(base + S3C2410_RTCCON);
398                         writew(tmp & ~S3C2410_RTCCON_CLKRST,
399                                 base + S3C2410_RTCCON);
400                 }
401         }
402 }
403
404 static int __devexit s3c_rtc_remove(struct platform_device *dev)
405 {
406         struct rtc_device *rtc = platform_get_drvdata(dev);
407
408         platform_set_drvdata(dev, NULL);
409         rtc_device_unregister(rtc);
410
411         s3c_rtc_setpie(&dev->dev, 0);
412         s3c_rtc_setaie(&dev->dev, 0);
413
414         clk_disable(rtc_clk);
415         clk_put(rtc_clk);
416         rtc_clk = NULL;
417
418         iounmap(s3c_rtc_base);
419         release_resource(s3c_rtc_mem);
420         kfree(s3c_rtc_mem);
421
422         return 0;
423 }
424
425 static int __devinit s3c_rtc_probe(struct platform_device *pdev)
426 {
427         struct rtc_device *rtc;
428         struct rtc_time rtc_tm;
429         struct resource *res;
430         int ret;
431
432         pr_debug("%s: probe=%p\n", __func__, pdev);
433
434         /* find the IRQs */
435
436         s3c_rtc_tickno = platform_get_irq(pdev, 1);
437         if (s3c_rtc_tickno < 0) {
438                 dev_err(&pdev->dev, "no irq for rtc tick\n");
439                 return -ENOENT;
440         }
441
442         s3c_rtc_alarmno = platform_get_irq(pdev, 0);
443         if (s3c_rtc_alarmno < 0) {
444                 dev_err(&pdev->dev, "no irq for alarm\n");
445                 return -ENOENT;
446         }
447
448         pr_debug("s3c2410_rtc: tick irq %d, alarm irq %d\n",
449                  s3c_rtc_tickno, s3c_rtc_alarmno);
450
451         /* get the memory region */
452
453         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
454         if (res == NULL) {
455                 dev_err(&pdev->dev, "failed to get memory region resource\n");
456                 return -ENOENT;
457         }
458
459         s3c_rtc_mem = request_mem_region(res->start,
460                                          res->end-res->start+1,
461                                          pdev->name);
462
463         if (s3c_rtc_mem == NULL) {
464                 dev_err(&pdev->dev, "failed to reserve memory region\n");
465                 ret = -ENOENT;
466                 goto err_nores;
467         }
468
469         s3c_rtc_base = ioremap(res->start, res->end - res->start + 1);
470         if (s3c_rtc_base == NULL) {
471                 dev_err(&pdev->dev, "failed ioremap()\n");
472                 ret = -EINVAL;
473                 goto err_nomap;
474         }
475
476         rtc_clk = clk_get(&pdev->dev, "rtc");
477         if (IS_ERR(rtc_clk)) {
478                 dev_err(&pdev->dev, "failed to find rtc clock source\n");
479                 ret = PTR_ERR(rtc_clk);
480                 rtc_clk = NULL;
481                 goto err_clk;
482         }
483
484         clk_enable(rtc_clk);
485
486         /* check to see if everything is setup correctly */
487
488         s3c_rtc_enable(pdev, 1);
489
490         pr_debug("s3c2410_rtc: RTCCON=%02x\n",
491                  readw(s3c_rtc_base + S3C2410_RTCCON));
492
493         device_init_wakeup(&pdev->dev, 1);
494
495         /* register RTC and exit */
496
497         rtc = rtc_device_register("s3c", &pdev->dev, &s3c_rtcops,
498                                   THIS_MODULE);
499
500         if (IS_ERR(rtc)) {
501                 dev_err(&pdev->dev, "cannot attach rtc\n");
502                 ret = PTR_ERR(rtc);
503                 goto err_nortc;
504         }
505
506         s3c_rtc_cpu_type = platform_get_device_id(pdev)->driver_data;
507
508         /* Check RTC Time */
509
510         s3c_rtc_gettime(NULL, &rtc_tm);
511
512         if (rtc_valid_tm(&rtc_tm)) {
513                 rtc_tm.tm_year  = 100;
514                 rtc_tm.tm_mon   = 0;
515                 rtc_tm.tm_mday  = 1;
516                 rtc_tm.tm_hour  = 0;
517                 rtc_tm.tm_min   = 0;
518                 rtc_tm.tm_sec   = 0;
519
520                 s3c_rtc_settime(NULL, &rtc_tm);
521
522                 dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n");
523         }
524
525         if (s3c_rtc_cpu_type == TYPE_S3C64XX)
526                 rtc->max_user_freq = 32768;
527         else
528                 rtc->max_user_freq = 128;
529
530         platform_set_drvdata(pdev, rtc);
531
532         s3c_rtc_setfreq(&pdev->dev, 1);
533
534         return 0;
535
536  err_nortc:
537         s3c_rtc_enable(pdev, 0);
538         clk_disable(rtc_clk);
539         clk_put(rtc_clk);
540
541  err_clk:
542         iounmap(s3c_rtc_base);
543
544  err_nomap:
545         release_resource(s3c_rtc_mem);
546
547  err_nores:
548         return ret;
549 }
550
551 #ifdef CONFIG_PM
552
553 /* RTC Power management control */
554
555 static int ticnt_save, ticnt_en_save;
556
557 static int s3c_rtc_suspend(struct platform_device *pdev, pm_message_t state)
558 {
559         /* save TICNT for anyone using periodic interrupts */
560         ticnt_save = readb(s3c_rtc_base + S3C2410_TICNT);
561         if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
562                 ticnt_en_save = readw(s3c_rtc_base + S3C2410_RTCCON);
563                 ticnt_en_save &= S3C64XX_RTCCON_TICEN;
564         }
565         s3c_rtc_enable(pdev, 0);
566
567         if (device_may_wakeup(&pdev->dev))
568                 enable_irq_wake(s3c_rtc_alarmno);
569
570         return 0;
571 }
572
573 static int s3c_rtc_resume(struct platform_device *pdev)
574 {
575         unsigned int tmp;
576
577         s3c_rtc_enable(pdev, 1);
578         writeb(ticnt_save, s3c_rtc_base + S3C2410_TICNT);
579         if (s3c_rtc_cpu_type == TYPE_S3C64XX && ticnt_en_save) {
580                 tmp = readw(s3c_rtc_base + S3C2410_RTCCON);
581                 writew(tmp | ticnt_en_save, s3c_rtc_base + S3C2410_RTCCON);
582         }
583
584         if (device_may_wakeup(&pdev->dev))
585                 disable_irq_wake(s3c_rtc_alarmno);
586
587         return 0;
588 }
589 #else
590 #define s3c_rtc_suspend NULL
591 #define s3c_rtc_resume  NULL
592 #endif
593
594 static struct platform_device_id s3c_rtc_driver_ids[] = {
595         {
596                 .name           = "s3c2410-rtc",
597                 .driver_data    = TYPE_S3C2410,
598         }, {
599                 .name           = "s3c64xx-rtc",
600                 .driver_data    = TYPE_S3C64XX,
601         },
602         { }
603 };
604
605 MODULE_DEVICE_TABLE(platform, s3c_rtc_driver_ids);
606
607 static struct platform_driver s3c_rtc_driver = {
608         .probe          = s3c_rtc_probe,
609         .remove         = __devexit_p(s3c_rtc_remove),
610         .suspend        = s3c_rtc_suspend,
611         .resume         = s3c_rtc_resume,
612         .id_table       = s3c_rtc_driver_ids,
613         .driver         = {
614                 .name   = "s3c-rtc",
615                 .owner  = THIS_MODULE,
616         },
617 };
618
619 static char __initdata banner[] = "S3C24XX RTC, (c) 2004,2006 Simtec Electronics\n";
620
621 static int __init s3c_rtc_init(void)
622 {
623         printk(banner);
624         return platform_driver_register(&s3c_rtc_driver);
625 }
626
627 static void __exit s3c_rtc_exit(void)
628 {
629         platform_driver_unregister(&s3c_rtc_driver);
630 }
631
632 module_init(s3c_rtc_init);
633 module_exit(s3c_rtc_exit);
634
635 MODULE_DESCRIPTION("Samsung S3C RTC Driver");
636 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
637 MODULE_LICENSE("GPL");
638 MODULE_ALIAS("platform:s3c2410-rtc");