Merge branch 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[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 bool wake_en;
50 static enum s3c_cpu_type s3c_rtc_cpu_type;
51
52 static DEFINE_SPINLOCK(s3c_rtc_pie_lock);
53
54 /* IRQ Handlers */
55
56 static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)
57 {
58         struct rtc_device *rdev = id;
59
60         rtc_update_irq(rdev, 1, RTC_AF | RTC_IRQF);
61
62         if (s3c_rtc_cpu_type == TYPE_S3C64XX)
63                 writeb(S3C2410_INTP_ALM, s3c_rtc_base + S3C2410_INTP);
64
65         return IRQ_HANDLED;
66 }
67
68 static irqreturn_t s3c_rtc_tickirq(int irq, void *id)
69 {
70         struct rtc_device *rdev = id;
71
72         rtc_update_irq(rdev, 1, RTC_PF | RTC_IRQF);
73
74         if (s3c_rtc_cpu_type == TYPE_S3C64XX)
75                 writeb(S3C2410_INTP_TIC, s3c_rtc_base + S3C2410_INTP);
76
77         return IRQ_HANDLED;
78 }
79
80 /* Update control registers */
81 static int s3c_rtc_setaie(struct device *dev, unsigned int enabled)
82 {
83         unsigned int tmp;
84
85         pr_debug("%s: aie=%d\n", __func__, enabled);
86
87         tmp = readb(s3c_rtc_base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
88
89         if (enabled)
90                 tmp |= S3C2410_RTCALM_ALMEN;
91
92         writeb(tmp, s3c_rtc_base + S3C2410_RTCALM);
93
94         return 0;
95 }
96
97 static int s3c_rtc_setfreq(struct device *dev, int freq)
98 {
99         struct platform_device *pdev = to_platform_device(dev);
100         struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
101         unsigned int tmp = 0;
102
103         if (!is_power_of_2(freq))
104                 return -EINVAL;
105
106         spin_lock_irq(&s3c_rtc_pie_lock);
107
108         if (s3c_rtc_cpu_type == TYPE_S3C2410) {
109                 tmp = readb(s3c_rtc_base + S3C2410_TICNT);
110                 tmp &= S3C2410_TICNT_ENABLE;
111         }
112
113         tmp |= (rtc_dev->max_user_freq / freq)-1;
114
115         writel(tmp, s3c_rtc_base + S3C2410_TICNT);
116         spin_unlock_irq(&s3c_rtc_pie_lock);
117
118         return 0;
119 }
120
121 /* Time read/write */
122
123 static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
124 {
125         unsigned int have_retried = 0;
126         void __iomem *base = s3c_rtc_base;
127
128  retry_get_time:
129         rtc_tm->tm_min  = readb(base + S3C2410_RTCMIN);
130         rtc_tm->tm_hour = readb(base + S3C2410_RTCHOUR);
131         rtc_tm->tm_mday = readb(base + S3C2410_RTCDATE);
132         rtc_tm->tm_mon  = readb(base + S3C2410_RTCMON);
133         rtc_tm->tm_year = readb(base + S3C2410_RTCYEAR);
134         rtc_tm->tm_sec  = readb(base + S3C2410_RTCSEC);
135
136         /* the only way to work out wether the system was mid-update
137          * when we read it is to check the second counter, and if it
138          * is zero, then we re-try the entire read
139          */
140
141         if (rtc_tm->tm_sec == 0 && !have_retried) {
142                 have_retried = 1;
143                 goto retry_get_time;
144         }
145
146         pr_debug("read time %04d.%02d.%02d %02d:%02d:%02d\n",
147                  1900 + rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday,
148                  rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);
149
150         rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
151         rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
152         rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
153         rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
154         rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
155         rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);
156
157         rtc_tm->tm_year += 100;
158         rtc_tm->tm_mon -= 1;
159
160         return rtc_valid_tm(rtc_tm);
161 }
162
163 static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
164 {
165         void __iomem *base = s3c_rtc_base;
166         int year = tm->tm_year - 100;
167
168         pr_debug("set time %04d.%02d.%02d %02d:%02d:%02d\n",
169                  1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
170                  tm->tm_hour, tm->tm_min, tm->tm_sec);
171
172         /* we get around y2k by simply not supporting it */
173
174         if (year < 0 || year >= 100) {
175                 dev_err(dev, "rtc only supports 100 years\n");
176                 return -EINVAL;
177         }
178
179         writeb(bin2bcd(tm->tm_sec),  base + S3C2410_RTCSEC);
180         writeb(bin2bcd(tm->tm_min),  base + S3C2410_RTCMIN);
181         writeb(bin2bcd(tm->tm_hour), base + S3C2410_RTCHOUR);
182         writeb(bin2bcd(tm->tm_mday), base + S3C2410_RTCDATE);
183         writeb(bin2bcd(tm->tm_mon + 1), base + S3C2410_RTCMON);
184         writeb(bin2bcd(year), base + S3C2410_RTCYEAR);
185
186         return 0;
187 }
188
189 static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
190 {
191         struct rtc_time *alm_tm = &alrm->time;
192         void __iomem *base = s3c_rtc_base;
193         unsigned int alm_en;
194
195         alm_tm->tm_sec  = readb(base + S3C2410_ALMSEC);
196         alm_tm->tm_min  = readb(base + S3C2410_ALMMIN);
197         alm_tm->tm_hour = readb(base + S3C2410_ALMHOUR);
198         alm_tm->tm_mon  = readb(base + S3C2410_ALMMON);
199         alm_tm->tm_mday = readb(base + S3C2410_ALMDATE);
200         alm_tm->tm_year = readb(base + S3C2410_ALMYEAR);
201
202         alm_en = readb(base + S3C2410_RTCALM);
203
204         alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0;
205
206         pr_debug("read alarm %d, %04d.%02d.%02d %02d:%02d:%02d\n",
207                  alm_en,
208                  1900 + alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday,
209                  alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec);
210
211
212         /* decode the alarm enable field */
213
214         if (alm_en & S3C2410_RTCALM_SECEN)
215                 alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec);
216         else
217                 alm_tm->tm_sec = -1;
218
219         if (alm_en & S3C2410_RTCALM_MINEN)
220                 alm_tm->tm_min = bcd2bin(alm_tm->tm_min);
221         else
222                 alm_tm->tm_min = -1;
223
224         if (alm_en & S3C2410_RTCALM_HOUREN)
225                 alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour);
226         else
227                 alm_tm->tm_hour = -1;
228
229         if (alm_en & S3C2410_RTCALM_DAYEN)
230                 alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday);
231         else
232                 alm_tm->tm_mday = -1;
233
234         if (alm_en & S3C2410_RTCALM_MONEN) {
235                 alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon);
236                 alm_tm->tm_mon -= 1;
237         } else {
238                 alm_tm->tm_mon = -1;
239         }
240
241         if (alm_en & S3C2410_RTCALM_YEAREN)
242                 alm_tm->tm_year = bcd2bin(alm_tm->tm_year);
243         else
244                 alm_tm->tm_year = -1;
245
246         return 0;
247 }
248
249 static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
250 {
251         struct rtc_time *tm = &alrm->time;
252         void __iomem *base = s3c_rtc_base;
253         unsigned int alrm_en;
254
255         pr_debug("s3c_rtc_setalarm: %d, %04d.%02d.%02d %02d:%02d:%02d\n",
256                  alrm->enabled,
257                  1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
258                  tm->tm_hour, tm->tm_min, tm->tm_sec);
259
260
261         alrm_en = readb(base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
262         writeb(0x00, base + S3C2410_RTCALM);
263
264         if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
265                 alrm_en |= S3C2410_RTCALM_SECEN;
266                 writeb(bin2bcd(tm->tm_sec), base + S3C2410_ALMSEC);
267         }
268
269         if (tm->tm_min < 60 && tm->tm_min >= 0) {
270                 alrm_en |= S3C2410_RTCALM_MINEN;
271                 writeb(bin2bcd(tm->tm_min), base + S3C2410_ALMMIN);
272         }
273
274         if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
275                 alrm_en |= S3C2410_RTCALM_HOUREN;
276                 writeb(bin2bcd(tm->tm_hour), base + S3C2410_ALMHOUR);
277         }
278
279         pr_debug("setting S3C2410_RTCALM to %08x\n", alrm_en);
280
281         writeb(alrm_en, base + S3C2410_RTCALM);
282
283         s3c_rtc_setaie(dev, alrm->enabled);
284
285         return 0;
286 }
287
288 static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
289 {
290         unsigned int ticnt;
291
292         if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
293                 ticnt = readw(s3c_rtc_base + S3C2410_RTCCON);
294                 ticnt &= S3C64XX_RTCCON_TICEN;
295         } else {
296                 ticnt = readb(s3c_rtc_base + S3C2410_TICNT);
297                 ticnt &= S3C2410_TICNT_ENABLE;
298         }
299
300         seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt  ? "yes" : "no");
301         return 0;
302 }
303
304 static int s3c_rtc_open(struct device *dev)
305 {
306         struct platform_device *pdev = to_platform_device(dev);
307         struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
308         int ret;
309
310         ret = request_irq(s3c_rtc_alarmno, s3c_rtc_alarmirq,
311                           IRQF_DISABLED,  "s3c2410-rtc alarm", rtc_dev);
312
313         if (ret) {
314                 dev_err(dev, "IRQ%d error %d\n", s3c_rtc_alarmno, ret);
315                 return ret;
316         }
317
318         ret = request_irq(s3c_rtc_tickno, s3c_rtc_tickirq,
319                           IRQF_DISABLED,  "s3c2410-rtc tick", rtc_dev);
320
321         if (ret) {
322                 dev_err(dev, "IRQ%d error %d\n", s3c_rtc_tickno, ret);
323                 goto tick_err;
324         }
325
326         return ret;
327
328  tick_err:
329         free_irq(s3c_rtc_alarmno, rtc_dev);
330         return ret;
331 }
332
333 static void s3c_rtc_release(struct device *dev)
334 {
335         struct platform_device *pdev = to_platform_device(dev);
336         struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
337
338         /* do not clear AIE here, it may be needed for wake */
339
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_setaie(&dev->dev, 0);
412
413         clk_disable(rtc_clk);
414         clk_put(rtc_clk);
415         rtc_clk = NULL;
416
417         iounmap(s3c_rtc_base);
418         release_resource(s3c_rtc_mem);
419         kfree(s3c_rtc_mem);
420
421         return 0;
422 }
423
424 static int __devinit s3c_rtc_probe(struct platform_device *pdev)
425 {
426         struct rtc_device *rtc;
427         struct rtc_time rtc_tm;
428         struct resource *res;
429         int ret;
430
431         pr_debug("%s: probe=%p\n", __func__, pdev);
432
433         /* find the IRQs */
434
435         s3c_rtc_tickno = platform_get_irq(pdev, 1);
436         if (s3c_rtc_tickno < 0) {
437                 dev_err(&pdev->dev, "no irq for rtc tick\n");
438                 return -ENOENT;
439         }
440
441         s3c_rtc_alarmno = platform_get_irq(pdev, 0);
442         if (s3c_rtc_alarmno < 0) {
443                 dev_err(&pdev->dev, "no irq for alarm\n");
444                 return -ENOENT;
445         }
446
447         pr_debug("s3c2410_rtc: tick irq %d, alarm irq %d\n",
448                  s3c_rtc_tickno, s3c_rtc_alarmno);
449
450         /* get the memory region */
451
452         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
453         if (res == NULL) {
454                 dev_err(&pdev->dev, "failed to get memory region resource\n");
455                 return -ENOENT;
456         }
457
458         s3c_rtc_mem = request_mem_region(res->start,
459                                          res->end-res->start+1,
460                                          pdev->name);
461
462         if (s3c_rtc_mem == NULL) {
463                 dev_err(&pdev->dev, "failed to reserve memory region\n");
464                 ret = -ENOENT;
465                 goto err_nores;
466         }
467
468         s3c_rtc_base = ioremap(res->start, res->end - res->start + 1);
469         if (s3c_rtc_base == NULL) {
470                 dev_err(&pdev->dev, "failed ioremap()\n");
471                 ret = -EINVAL;
472                 goto err_nomap;
473         }
474
475         rtc_clk = clk_get(&pdev->dev, "rtc");
476         if (IS_ERR(rtc_clk)) {
477                 dev_err(&pdev->dev, "failed to find rtc clock source\n");
478                 ret = PTR_ERR(rtc_clk);
479                 rtc_clk = NULL;
480                 goto err_clk;
481         }
482
483         clk_enable(rtc_clk);
484
485         /* check to see if everything is setup correctly */
486
487         s3c_rtc_enable(pdev, 1);
488
489         pr_debug("s3c2410_rtc: RTCCON=%02x\n",
490                  readw(s3c_rtc_base + S3C2410_RTCCON));
491
492         device_init_wakeup(&pdev->dev, 1);
493
494         /* register RTC and exit */
495
496         rtc = rtc_device_register("s3c", &pdev->dev, &s3c_rtcops,
497                                   THIS_MODULE);
498
499         if (IS_ERR(rtc)) {
500                 dev_err(&pdev->dev, "cannot attach rtc\n");
501                 ret = PTR_ERR(rtc);
502                 goto err_nortc;
503         }
504
505         s3c_rtc_cpu_type = platform_get_device_id(pdev)->driver_data;
506
507         /* Check RTC Time */
508
509         s3c_rtc_gettime(NULL, &rtc_tm);
510
511         if (rtc_valid_tm(&rtc_tm)) {
512                 rtc_tm.tm_year  = 100;
513                 rtc_tm.tm_mon   = 0;
514                 rtc_tm.tm_mday  = 1;
515                 rtc_tm.tm_hour  = 0;
516                 rtc_tm.tm_min   = 0;
517                 rtc_tm.tm_sec   = 0;
518
519                 s3c_rtc_settime(NULL, &rtc_tm);
520
521                 dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n");
522         }
523
524         if (s3c_rtc_cpu_type == TYPE_S3C64XX)
525                 rtc->max_user_freq = 32768;
526         else
527                 rtc->max_user_freq = 128;
528
529         platform_set_drvdata(pdev, rtc);
530
531         s3c_rtc_setfreq(&pdev->dev, 1);
532
533         return 0;
534
535  err_nortc:
536         s3c_rtc_enable(pdev, 0);
537         clk_disable(rtc_clk);
538         clk_put(rtc_clk);
539
540  err_clk:
541         iounmap(s3c_rtc_base);
542
543  err_nomap:
544         release_resource(s3c_rtc_mem);
545
546  err_nores:
547         return ret;
548 }
549
550 #ifdef CONFIG_PM
551
552 /* RTC Power management control */
553
554 static int ticnt_save, ticnt_en_save;
555
556 static int s3c_rtc_suspend(struct platform_device *pdev, pm_message_t state)
557 {
558         /* save TICNT for anyone using periodic interrupts */
559         ticnt_save = readb(s3c_rtc_base + S3C2410_TICNT);
560         if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
561                 ticnt_en_save = readw(s3c_rtc_base + S3C2410_RTCCON);
562                 ticnt_en_save &= S3C64XX_RTCCON_TICEN;
563         }
564         s3c_rtc_enable(pdev, 0);
565
566         if (device_may_wakeup(&pdev->dev) && !wake_en) {
567                 if (enable_irq_wake(s3c_rtc_alarmno) == 0)
568                         wake_en = true;
569                 else
570                         dev_err(&pdev->dev, "enable_irq_wake failed\n");
571         }
572
573         return 0;
574 }
575
576 static int s3c_rtc_resume(struct platform_device *pdev)
577 {
578         unsigned int tmp;
579
580         s3c_rtc_enable(pdev, 1);
581         writeb(ticnt_save, s3c_rtc_base + S3C2410_TICNT);
582         if (s3c_rtc_cpu_type == TYPE_S3C64XX && ticnt_en_save) {
583                 tmp = readw(s3c_rtc_base + S3C2410_RTCCON);
584                 writew(tmp | ticnt_en_save, s3c_rtc_base + S3C2410_RTCCON);
585         }
586
587         if (device_may_wakeup(&pdev->dev) && wake_en) {
588                 disable_irq_wake(s3c_rtc_alarmno);
589                 wake_en = false;
590         }
591
592         return 0;
593 }
594 #else
595 #define s3c_rtc_suspend NULL
596 #define s3c_rtc_resume  NULL
597 #endif
598
599 static struct platform_device_id s3c_rtc_driver_ids[] = {
600         {
601                 .name           = "s3c2410-rtc",
602                 .driver_data    = TYPE_S3C2410,
603         }, {
604                 .name           = "s3c64xx-rtc",
605                 .driver_data    = TYPE_S3C64XX,
606         },
607         { }
608 };
609
610 MODULE_DEVICE_TABLE(platform, s3c_rtc_driver_ids);
611
612 static struct platform_driver s3c_rtc_driver = {
613         .probe          = s3c_rtc_probe,
614         .remove         = __devexit_p(s3c_rtc_remove),
615         .suspend        = s3c_rtc_suspend,
616         .resume         = s3c_rtc_resume,
617         .id_table       = s3c_rtc_driver_ids,
618         .driver         = {
619                 .name   = "s3c-rtc",
620                 .owner  = THIS_MODULE,
621         },
622 };
623
624 static char __initdata banner[] = "S3C24XX RTC, (c) 2004,2006 Simtec Electronics\n";
625
626 static int __init s3c_rtc_init(void)
627 {
628         printk(banner);
629         return platform_driver_register(&s3c_rtc_driver);
630 }
631
632 static void __exit s3c_rtc_exit(void)
633 {
634         platform_driver_unregister(&s3c_rtc_driver);
635 }
636
637 module_init(s3c_rtc_init);
638 module_exit(s3c_rtc_exit);
639
640 MODULE_DESCRIPTION("Samsung S3C RTC Driver");
641 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
642 MODULE_LICENSE("GPL");
643 MODULE_ALIAS("platform:s3c2410-rtc");