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mm: vmscan: fix force-scanning small targets without swap
[linux-2.6.git] / drivers / rtc / rtc-s3c.c
blob4e7c04e773e0167bcb35ea1653ea86b8939900b4
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 clk_enable(rtc_clk);
61 rtc_update_irq(rdev, 1, RTC_AF | RTC_IRQF);
62
63 if (s3c_rtc_cpu_type == TYPE_S3C64XX)
64 writeb(S3C2410_INTP_ALM, s3c_rtc_base + S3C2410_INTP);
65
66 clk_disable(rtc_clk);
67 return IRQ_HANDLED;
68 }
69
70 static irqreturn_t s3c_rtc_tickirq(int irq, void *id)
71 {
72 struct rtc_device *rdev = id;
73
74 clk_enable(rtc_clk);
75 rtc_update_irq(rdev, 1, RTC_PF | RTC_IRQF);
76
77 if (s3c_rtc_cpu_type == TYPE_S3C64XX)
78 writeb(S3C2410_INTP_TIC, s3c_rtc_base + S3C2410_INTP);
79
80 clk_disable(rtc_clk);
81 return IRQ_HANDLED;
82 }
83
84 /* Update control registers */
85 static int s3c_rtc_setaie(struct device *dev, unsigned int enabled)
86 {
87 unsigned int tmp;
88
89 pr_debug("%s: aie=%d\n", __func__, enabled);
90
91 clk_enable(rtc_clk);
92 tmp = readb(s3c_rtc_base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
93
94 if (enabled)
95 tmp |= S3C2410_RTCALM_ALMEN;
96
97 writeb(tmp, s3c_rtc_base + S3C2410_RTCALM);
98 clk_disable(rtc_clk);
99
100 return 0;
101 }
102
103 static int s3c_rtc_setfreq(struct device *dev, int freq)
104 {
105 struct platform_device *pdev = to_platform_device(dev);
106 struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
107 unsigned int tmp = 0;
108
109 if (!is_power_of_2(freq))
110 return -EINVAL;
111
112 clk_enable(rtc_clk);
113 spin_lock_irq(&s3c_rtc_pie_lock);
114
115 if (s3c_rtc_cpu_type == TYPE_S3C2410) {
116 tmp = readb(s3c_rtc_base + S3C2410_TICNT);
117 tmp &= S3C2410_TICNT_ENABLE;
118 }
119
120 tmp |= (rtc_dev->max_user_freq / freq)-1;
121
122 writel(tmp, s3c_rtc_base + S3C2410_TICNT);
123 spin_unlock_irq(&s3c_rtc_pie_lock);
124 clk_disable(rtc_clk);
125
126 return 0;
127 }
128
129 /* Time read/write */
130
131 static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
132 {
133 unsigned int have_retried = 0;
134 void __iomem *base = s3c_rtc_base;
135
136 clk_enable(rtc_clk);
137 retry_get_time:
138 rtc_tm->tm_min = readb(base + S3C2410_RTCMIN);
139 rtc_tm->tm_hour = readb(base + S3C2410_RTCHOUR);
140 rtc_tm->tm_mday = readb(base + S3C2410_RTCDATE);
141 rtc_tm->tm_mon = readb(base + S3C2410_RTCMON);
142 rtc_tm->tm_year = readb(base + S3C2410_RTCYEAR);
143 rtc_tm->tm_sec = readb(base + S3C2410_RTCSEC);
144
145 /* the only way to work out wether the system was mid-update
146 * when we read it is to check the second counter, and if it
147 * is zero, then we re-try the entire read
148 */
149
150 if (rtc_tm->tm_sec == 0 && !have_retried) {
151 have_retried = 1;
152 goto retry_get_time;
153 }
154
155 rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
156 rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
157 rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
158 rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
159 rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
160 rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);
161
162 rtc_tm->tm_year += 100;
163
164 pr_debug("read time %04d.%02d.%02d %02d:%02d:%02d\n",
165 1900 + rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday,
166 rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);
167
168 rtc_tm->tm_mon -= 1;
169
170 clk_disable(rtc_clk);
171 return rtc_valid_tm(rtc_tm);
172 }
173
174 static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
175 {
176 void __iomem *base = s3c_rtc_base;
177 int year = tm->tm_year - 100;
178
179 clk_enable(rtc_clk);
180 pr_debug("set time %04d.%02d.%02d %02d:%02d:%02d\n",
181 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
182 tm->tm_hour, tm->tm_min, tm->tm_sec);
183
184 /* we get around y2k by simply not supporting it */
185
186 if (year < 0 || year >= 100) {
187 dev_err(dev, "rtc only supports 100 years\n");
188 return -EINVAL;
189 }
190
191 writeb(bin2bcd(tm->tm_sec), base + S3C2410_RTCSEC);
192 writeb(bin2bcd(tm->tm_min), base + S3C2410_RTCMIN);
193 writeb(bin2bcd(tm->tm_hour), base + S3C2410_RTCHOUR);
194 writeb(bin2bcd(tm->tm_mday), base + S3C2410_RTCDATE);
195 writeb(bin2bcd(tm->tm_mon + 1), base + S3C2410_RTCMON);
196 writeb(bin2bcd(year), base + S3C2410_RTCYEAR);
197 clk_disable(rtc_clk);
198
199 return 0;
200 }
201
202 static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
203 {
204 struct rtc_time *alm_tm = &alrm->time;
205 void __iomem *base = s3c_rtc_base;
206 unsigned int alm_en;
207
208 clk_enable(rtc_clk);
209 alm_tm->tm_sec = readb(base + S3C2410_ALMSEC);
210 alm_tm->tm_min = readb(base + S3C2410_ALMMIN);
211 alm_tm->tm_hour = readb(base + S3C2410_ALMHOUR);
212 alm_tm->tm_mon = readb(base + S3C2410_ALMMON);
213 alm_tm->tm_mday = readb(base + S3C2410_ALMDATE);
214 alm_tm->tm_year = readb(base + S3C2410_ALMYEAR);
215
216 alm_en = readb(base + S3C2410_RTCALM);
217
218 alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0;
219
220 pr_debug("read alarm %d, %04d.%02d.%02d %02d:%02d:%02d\n",
221 alm_en,
222 1900 + alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday,
223 alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec);
224
225
226 /* decode the alarm enable field */
227
228 if (alm_en & S3C2410_RTCALM_SECEN)
229 alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec);
230 else
231 alm_tm->tm_sec = -1;
232
233 if (alm_en & S3C2410_RTCALM_MINEN)
234 alm_tm->tm_min = bcd2bin(alm_tm->tm_min);
235 else
236 alm_tm->tm_min = -1;
237
238 if (alm_en & S3C2410_RTCALM_HOUREN)
239 alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour);
240 else
241 alm_tm->tm_hour = -1;
242
243 if (alm_en & S3C2410_RTCALM_DAYEN)
244 alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday);
245 else
246 alm_tm->tm_mday = -1;
247
248 if (alm_en & S3C2410_RTCALM_MONEN) {
249 alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon);
250 alm_tm->tm_mon -= 1;
251 } else {
252 alm_tm->tm_mon = -1;
253 }
254
255 if (alm_en & S3C2410_RTCALM_YEAREN)
256 alm_tm->tm_year = bcd2bin(alm_tm->tm_year);
257 else
258 alm_tm->tm_year = -1;
259
260 clk_disable(rtc_clk);
261 return 0;
262 }
263
264 static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
265 {
266 struct rtc_time *tm = &alrm->time;
267 void __iomem *base = s3c_rtc_base;
268 unsigned int alrm_en;
269
270 clk_enable(rtc_clk);
271 pr_debug("s3c_rtc_setalarm: %d, %04d.%02d.%02d %02d:%02d:%02d\n",
272 alrm->enabled,
273 1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday,
274 tm->tm_hour, tm->tm_min, tm->tm_sec);
275
276 alrm_en = readb(base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
277 writeb(0x00, base + S3C2410_RTCALM);
278
279 if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
280 alrm_en |= S3C2410_RTCALM_SECEN;
281 writeb(bin2bcd(tm->tm_sec), base + S3C2410_ALMSEC);
282 }
283
284 if (tm->tm_min < 60 && tm->tm_min >= 0) {
285 alrm_en |= S3C2410_RTCALM_MINEN;
286 writeb(bin2bcd(tm->tm_min), base + S3C2410_ALMMIN);
287 }
288
289 if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
290 alrm_en |= S3C2410_RTCALM_HOUREN;
291 writeb(bin2bcd(tm->tm_hour), base + S3C2410_ALMHOUR);
292 }
293
294 pr_debug("setting S3C2410_RTCALM to %08x\n", alrm_en);
295
296 writeb(alrm_en, base + S3C2410_RTCALM);
297
298 s3c_rtc_setaie(dev, alrm->enabled);
299
300 clk_disable(rtc_clk);
301 return 0;
302 }
303
304 static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
305 {
306 unsigned int ticnt;
307
308 clk_enable(rtc_clk);
309 if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
310 ticnt = readw(s3c_rtc_base + S3C2410_RTCCON);
311 ticnt &= S3C64XX_RTCCON_TICEN;
312 } else {
313 ticnt = readb(s3c_rtc_base + S3C2410_TICNT);
314 ticnt &= S3C2410_TICNT_ENABLE;
315 }
316
317 seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no");
318 clk_disable(rtc_clk);
319 return 0;
320 }
321
322 static const struct rtc_class_ops s3c_rtcops = {
323 .read_time = s3c_rtc_gettime,
324 .set_time = s3c_rtc_settime,
325 .read_alarm = s3c_rtc_getalarm,
326 .set_alarm = s3c_rtc_setalarm,
327 .proc = s3c_rtc_proc,
328 .alarm_irq_enable = s3c_rtc_setaie,
329 };
330
331 static void s3c_rtc_enable(struct platform_device *pdev, int en)
332 {
333 void __iomem *base = s3c_rtc_base;
334 unsigned int tmp;
335
336 if (s3c_rtc_base == NULL)
337 return;
338
339 clk_enable(rtc_clk);
340 if (!en) {
341 tmp = readw(base + S3C2410_RTCCON);
342 if (s3c_rtc_cpu_type == TYPE_S3C64XX)
343 tmp &= ~S3C64XX_RTCCON_TICEN;
344 tmp &= ~S3C2410_RTCCON_RTCEN;
345 writew(tmp, base + S3C2410_RTCCON);
346
347 if (s3c_rtc_cpu_type == TYPE_S3C2410) {
348 tmp = readb(base + S3C2410_TICNT);
349 tmp &= ~S3C2410_TICNT_ENABLE;
350 writeb(tmp, base + S3C2410_TICNT);
351 }
352 } else {
353 /* re-enable the device, and check it is ok */
354
355 if ((readw(base+S3C2410_RTCCON) & S3C2410_RTCCON_RTCEN) == 0) {
356 dev_info(&pdev->dev, "rtc disabled, re-enabling\n");
357
358 tmp = readw(base + S3C2410_RTCCON);
359 writew(tmp | S3C2410_RTCCON_RTCEN,
360 base + S3C2410_RTCCON);
361 }
362
363 if ((readw(base + S3C2410_RTCCON) & S3C2410_RTCCON_CNTSEL)) {
364 dev_info(&pdev->dev, "removing RTCCON_CNTSEL\n");
365
366 tmp = readw(base + S3C2410_RTCCON);
367 writew(tmp & ~S3C2410_RTCCON_CNTSEL,
368 base + S3C2410_RTCCON);
369 }
370
371 if ((readw(base + S3C2410_RTCCON) & S3C2410_RTCCON_CLKRST)) {
372 dev_info(&pdev->dev, "removing RTCCON_CLKRST\n");
373
374 tmp = readw(base + S3C2410_RTCCON);
375 writew(tmp & ~S3C2410_RTCCON_CLKRST,
376 base + S3C2410_RTCCON);
377 }
378 }
379 clk_disable(rtc_clk);
380 }
381
382 static int __devexit s3c_rtc_remove(struct platform_device *dev)
383 {
384 struct rtc_device *rtc = platform_get_drvdata(dev);
385
386 free_irq(s3c_rtc_alarmno, rtc);
387 free_irq(s3c_rtc_tickno, rtc);
388
389 platform_set_drvdata(dev, NULL);
390 rtc_device_unregister(rtc);
391
392 s3c_rtc_setaie(&dev->dev, 0);
393
394 clk_put(rtc_clk);
395 rtc_clk = NULL;
396
397 iounmap(s3c_rtc_base);
398 release_resource(s3c_rtc_mem);
399 kfree(s3c_rtc_mem);
400
401 return 0;
402 }
403
404 static int __devinit s3c_rtc_probe(struct platform_device *pdev)
405 {
406 struct rtc_device *rtc;
407 struct rtc_time rtc_tm;
408 struct resource *res;
409 int ret;
410
411 pr_debug("%s: probe=%p\n", __func__, pdev);
412
413 /* find the IRQs */
414
415 s3c_rtc_tickno = platform_get_irq(pdev, 1);
416 if (s3c_rtc_tickno < 0) {
417 dev_err(&pdev->dev, "no irq for rtc tick\n");
418 return -ENOENT;
419 }
420
421 s3c_rtc_alarmno = platform_get_irq(pdev, 0);
422 if (s3c_rtc_alarmno < 0) {
423 dev_err(&pdev->dev, "no irq for alarm\n");
424 return -ENOENT;
425 }
426
427 pr_debug("s3c2410_rtc: tick irq %d, alarm irq %d\n",
428 s3c_rtc_tickno, s3c_rtc_alarmno);
429
430 /* get the memory region */
431
432 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
433 if (res == NULL) {
434 dev_err(&pdev->dev, "failed to get memory region resource\n");
435 return -ENOENT;
436 }
437
438 s3c_rtc_mem = request_mem_region(res->start, resource_size(res),
439 pdev->name);
440
441 if (s3c_rtc_mem == NULL) {
442 dev_err(&pdev->dev, "failed to reserve memory region\n");
443 ret = -ENOENT;
444 goto err_nores;
445 }
446
447 s3c_rtc_base = ioremap(res->start, resource_size(res));
448 if (s3c_rtc_base == NULL) {
449 dev_err(&pdev->dev, "failed ioremap()\n");
450 ret = -EINVAL;
451 goto err_nomap;
452 }
453
454 rtc_clk = clk_get(&pdev->dev, "rtc");
455 if (IS_ERR(rtc_clk)) {
456 dev_err(&pdev->dev, "failed to find rtc clock source\n");
457 ret = PTR_ERR(rtc_clk);
458 rtc_clk = NULL;
459 goto err_clk;
460 }
461
462 clk_enable(rtc_clk);
463
464 /* check to see if everything is setup correctly */
465
466 s3c_rtc_enable(pdev, 1);
467
468 pr_debug("s3c2410_rtc: RTCCON=%02x\n",
469 readw(s3c_rtc_base + S3C2410_RTCCON));
470
471 device_init_wakeup(&pdev->dev, 1);
472
473 /* register RTC and exit */
474
475 rtc = rtc_device_register("s3c", &pdev->dev, &s3c_rtcops,
476 THIS_MODULE);
477
478 if (IS_ERR(rtc)) {
479 dev_err(&pdev->dev, "cannot attach rtc\n");
480 ret = PTR_ERR(rtc);
481 goto err_nortc;
482 }
483
484 s3c_rtc_cpu_type = platform_get_device_id(pdev)->driver_data;
485
486 /* Check RTC Time */
487
488 s3c_rtc_gettime(NULL, &rtc_tm);
489
490 if (rtc_valid_tm(&rtc_tm)) {
491 rtc_tm.tm_year = 100;
492 rtc_tm.tm_mon = 0;
493 rtc_tm.tm_mday = 1;
494 rtc_tm.tm_hour = 0;
495 rtc_tm.tm_min = 0;
496 rtc_tm.tm_sec = 0;
497
498 s3c_rtc_settime(NULL, &rtc_tm);
499
500 dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n");
501 }
502
503 if (s3c_rtc_cpu_type == TYPE_S3C64XX)
504 rtc->max_user_freq = 32768;
505 else
506 rtc->max_user_freq = 128;
507
508 platform_set_drvdata(pdev, rtc);
509
510 s3c_rtc_setfreq(&pdev->dev, 1);
511
512 ret = request_irq(s3c_rtc_alarmno, s3c_rtc_alarmirq,
513 IRQF_DISABLED, "s3c2410-rtc alarm", rtc);
514 if (ret) {
515 dev_err(&pdev->dev, "IRQ%d error %d\n", s3c_rtc_alarmno, ret);
516 goto err_alarm_irq;
517 }
518
519 ret = request_irq(s3c_rtc_tickno, s3c_rtc_tickirq,
520 IRQF_DISABLED, "s3c2410-rtc tick", rtc);
521 if (ret) {
522 dev_err(&pdev->dev, "IRQ%d error %d\n", s3c_rtc_tickno, ret);
523 free_irq(s3c_rtc_alarmno, rtc);
524 goto err_tick_irq;
525 }
526
527 clk_disable(rtc_clk);
528
529 return 0;
530
531 err_tick_irq:
532 free_irq(s3c_rtc_alarmno, rtc);
533
534 err_alarm_irq:
535 platform_set_drvdata(pdev, NULL);
536 rtc_device_unregister(rtc);
537
538 err_nortc:
539 s3c_rtc_enable(pdev, 0);
540 clk_disable(rtc_clk);
541 clk_put(rtc_clk);
542
543 err_clk:
544 iounmap(s3c_rtc_base);
545
546 err_nomap:
547 release_resource(s3c_rtc_mem);
548
549 err_nores:
550 return ret;
551 }
552
553 #ifdef CONFIG_PM
554
555 /* RTC Power management control */
556
557 static int ticnt_save, ticnt_en_save;
558
559 static int s3c_rtc_suspend(struct platform_device *pdev, pm_message_t state)
560 {
561 clk_enable(rtc_clk);
562 /* save TICNT for anyone using periodic interrupts */
563 ticnt_save = readb(s3c_rtc_base + S3C2410_TICNT);
564 if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
565 ticnt_en_save = readw(s3c_rtc_base + S3C2410_RTCCON);
566 ticnt_en_save &= S3C64XX_RTCCON_TICEN;
567 }
568 s3c_rtc_enable(pdev, 0);
569
570 if (device_may_wakeup(&pdev->dev) && !wake_en) {
571 if (enable_irq_wake(s3c_rtc_alarmno) == 0)
572 wake_en = true;
573 else
574 dev_err(&pdev->dev, "enable_irq_wake failed\n");
575 }
576 clk_disable(rtc_clk);
577
578 return 0;
579 }
580
581 static int s3c_rtc_resume(struct platform_device *pdev)
582 {
583 unsigned int tmp;
584
585 clk_enable(rtc_clk);
586 s3c_rtc_enable(pdev, 1);
587 writeb(ticnt_save, s3c_rtc_base + S3C2410_TICNT);
588 if (s3c_rtc_cpu_type == TYPE_S3C64XX && ticnt_en_save) {
589 tmp = readw(s3c_rtc_base + S3C2410_RTCCON);
590 writew(tmp | ticnt_en_save, s3c_rtc_base + S3C2410_RTCCON);
591 }
592
593 if (device_may_wakeup(&pdev->dev) && wake_en) {
594 disable_irq_wake(s3c_rtc_alarmno);
595 wake_en = false;
596 }
597 clk_disable(rtc_clk);
598
599 return 0;
600 }
601 #else
602 #define s3c_rtc_suspend NULL
603 #define s3c_rtc_resume NULL
604 #endif
605
606 static struct platform_device_id s3c_rtc_driver_ids[] = {
607 {
608 .name = "s3c2410-rtc",
609 .driver_data = TYPE_S3C2410,
610 }, {
611 .name = "s3c64xx-rtc",
612 .driver_data = TYPE_S3C64XX,
613 },
614 { }
615 };
616
617 MODULE_DEVICE_TABLE(platform, s3c_rtc_driver_ids);
618
619 static struct platform_driver s3c_rtc_driver = {
620 .probe = s3c_rtc_probe,
621 .remove = __devexit_p(s3c_rtc_remove),
622 .suspend = s3c_rtc_suspend,
623 .resume = s3c_rtc_resume,
624 .id_table = s3c_rtc_driver_ids,
625 .driver = {
626 .name = "s3c-rtc",
627 .owner = THIS_MODULE,
628 },
629 };
630
631 static char __initdata banner[] = "S3C24XX RTC, (c) 2004,2006 Simtec Electronics\n";
632
633 static int __init s3c_rtc_init(void)
634 {
635 printk(banner);
636 return platform_driver_register(&s3c_rtc_driver);
637 }
638
639 static void __exit s3c_rtc_exit(void)
640 {
641 platform_driver_unregister(&s3c_rtc_driver);
642 }
643
644 module_init(s3c_rtc_init);
645 module_exit(s3c_rtc_exit);
646
647 MODULE_DESCRIPTION("Samsung S3C RTC Driver");
648 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
649 MODULE_LICENSE("GPL");
650 MODULE_ALIAS("platform:s3c2410-rtc");
Linus' kernel tree