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ACPI, APEI, EINJ, cleanup 0 vs NULL confusion
[linux-2.6.git] / drivers / rtc / rtc-s3c.c
blobaef40bd2957be7ccb2fd5adfebb6c6e13c3b6683
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 IRQF_DISABLED, "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 IRQF_DISABLED, "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");
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