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Merge branch 'pm-opp'
[deliverable/linux.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 #include <linux/uaccess.h>
30 #include <linux/io.h>
31
32 #include <asm/irq.h>
33 #include "rtc-s3c.h"
34
35 struct s3c_rtc {
36 struct device *dev;
37 struct rtc_device *rtc;
38
39 void __iomem *base;
40 struct clk *rtc_clk;
41 struct clk *rtc_src_clk;
42
43 struct s3c_rtc_data *data;
44
45 int irq_alarm;
46 int irq_tick;
47
48 spinlock_t pie_lock;
49 spinlock_t alarm_clk_lock;
50
51 int ticnt_save, ticnt_en_save;
52 bool wake_en;
53 };
54
55 struct s3c_rtc_data {
56 int max_user_freq;
57 bool needs_src_clk;
58
59 void (*irq_handler) (struct s3c_rtc *info, int mask);
60 void (*set_freq) (struct s3c_rtc *info, int freq);
61 void (*enable_tick) (struct s3c_rtc *info, struct seq_file *seq);
62 void (*select_tick_clk) (struct s3c_rtc *info);
63 void (*save_tick_cnt) (struct s3c_rtc *info);
64 void (*restore_tick_cnt) (struct s3c_rtc *info);
65 void (*enable) (struct s3c_rtc *info);
66 void (*disable) (struct s3c_rtc *info);
67 };
68
69 static void s3c_rtc_enable_clk(struct s3c_rtc *info)
70 {
71 unsigned long irq_flags;
72
73 spin_lock_irqsave(&info->alarm_clk_lock, irq_flags);
74 clk_enable(info->rtc_clk);
75 if (info->data->needs_src_clk)
76 clk_enable(info->rtc_src_clk);
77 spin_unlock_irqrestore(&info->alarm_clk_lock, irq_flags);
78 }
79
80 static void s3c_rtc_disable_clk(struct s3c_rtc *info)
81 {
82 unsigned long irq_flags;
83
84 spin_lock_irqsave(&info->alarm_clk_lock, irq_flags);
85 if (info->data->needs_src_clk)
86 clk_disable(info->rtc_src_clk);
87 clk_disable(info->rtc_clk);
88 spin_unlock_irqrestore(&info->alarm_clk_lock, irq_flags);
89 }
90
91 /* IRQ Handlers */
92 static irqreturn_t s3c_rtc_tickirq(int irq, void *id)
93 {
94 struct s3c_rtc *info = (struct s3c_rtc *)id;
95
96 if (info->data->irq_handler)
97 info->data->irq_handler(info, S3C2410_INTP_TIC);
98
99 return IRQ_HANDLED;
100 }
101
102 static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)
103 {
104 struct s3c_rtc *info = (struct s3c_rtc *)id;
105
106 if (info->data->irq_handler)
107 info->data->irq_handler(info, S3C2410_INTP_ALM);
108
109 return IRQ_HANDLED;
110 }
111
112 /* Update control registers */
113 static int s3c_rtc_setaie(struct device *dev, unsigned int enabled)
114 {
115 struct s3c_rtc *info = dev_get_drvdata(dev);
116 unsigned int tmp;
117
118 dev_dbg(info->dev, "%s: aie=%d\n", __func__, enabled);
119
120 s3c_rtc_enable_clk(info);
121
122 tmp = readb(info->base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
123
124 if (enabled)
125 tmp |= S3C2410_RTCALM_ALMEN;
126
127 writeb(tmp, info->base + S3C2410_RTCALM);
128
129 s3c_rtc_disable_clk(info);
130
131 return 0;
132 }
133
134 /* Set RTC frequency */
135 static int s3c_rtc_setfreq(struct s3c_rtc *info, int freq)
136 {
137 if (!is_power_of_2(freq))
138 return -EINVAL;
139
140 spin_lock_irq(&info->pie_lock);
141
142 if (info->data->set_freq)
143 info->data->set_freq(info, freq);
144
145 spin_unlock_irq(&info->pie_lock);
146
147 return 0;
148 }
149
150 /* Time read/write */
151 static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
152 {
153 struct s3c_rtc *info = dev_get_drvdata(dev);
154 unsigned int have_retried = 0;
155
156 s3c_rtc_enable_clk(info);
157
158 retry_get_time:
159 rtc_tm->tm_min = readb(info->base + S3C2410_RTCMIN);
160 rtc_tm->tm_hour = readb(info->base + S3C2410_RTCHOUR);
161 rtc_tm->tm_mday = readb(info->base + S3C2410_RTCDATE);
162 rtc_tm->tm_mon = readb(info->base + S3C2410_RTCMON);
163 rtc_tm->tm_year = readb(info->base + S3C2410_RTCYEAR);
164 rtc_tm->tm_sec = readb(info->base + S3C2410_RTCSEC);
165
166 /* the only way to work out whether the system was mid-update
167 * when we read it is to check the second counter, and if it
168 * is zero, then we re-try the entire read
169 */
170
171 if (rtc_tm->tm_sec == 0 && !have_retried) {
172 have_retried = 1;
173 goto retry_get_time;
174 }
175
176 rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
177 rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
178 rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
179 rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
180 rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
181 rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);
182
183 s3c_rtc_disable_clk(info);
184
185 rtc_tm->tm_year += 100;
186
187 dev_dbg(dev, "read time %04d.%02d.%02d %02d:%02d:%02d\n",
188 1900 + rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday,
189 rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);
190
191 rtc_tm->tm_mon -= 1;
192
193 return rtc_valid_tm(rtc_tm);
194 }
195
196 static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
197 {
198 struct s3c_rtc *info = dev_get_drvdata(dev);
199 int year = tm->tm_year - 100;
200
201 dev_dbg(dev, "set time %04d.%02d.%02d %02d:%02d:%02d\n",
202 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
203 tm->tm_hour, tm->tm_min, tm->tm_sec);
204
205 /* we get around y2k by simply not supporting it */
206
207 if (year < 0 || year >= 100) {
208 dev_err(dev, "rtc only supports 100 years\n");
209 return -EINVAL;
210 }
211
212 s3c_rtc_enable_clk(info);
213
214 writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_RTCSEC);
215 writeb(bin2bcd(tm->tm_min), info->base + S3C2410_RTCMIN);
216 writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_RTCHOUR);
217 writeb(bin2bcd(tm->tm_mday), info->base + S3C2410_RTCDATE);
218 writeb(bin2bcd(tm->tm_mon + 1), info->base + S3C2410_RTCMON);
219 writeb(bin2bcd(year), info->base + S3C2410_RTCYEAR);
220
221 s3c_rtc_disable_clk(info);
222
223 return 0;
224 }
225
226 static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
227 {
228 struct s3c_rtc *info = dev_get_drvdata(dev);
229 struct rtc_time *alm_tm = &alrm->time;
230 unsigned int alm_en;
231
232 s3c_rtc_enable_clk(info);
233
234 alm_tm->tm_sec = readb(info->base + S3C2410_ALMSEC);
235 alm_tm->tm_min = readb(info->base + S3C2410_ALMMIN);
236 alm_tm->tm_hour = readb(info->base + S3C2410_ALMHOUR);
237 alm_tm->tm_mon = readb(info->base + S3C2410_ALMMON);
238 alm_tm->tm_mday = readb(info->base + S3C2410_ALMDATE);
239 alm_tm->tm_year = readb(info->base + S3C2410_ALMYEAR);
240
241 alm_en = readb(info->base + S3C2410_RTCALM);
242
243 s3c_rtc_disable_clk(info);
244
245 alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0;
246
247 dev_dbg(dev, "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 /* decode the alarm enable field */
253 if (alm_en & S3C2410_RTCALM_SECEN)
254 alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec);
255 else
256 alm_tm->tm_sec = -1;
257
258 if (alm_en & S3C2410_RTCALM_MINEN)
259 alm_tm->tm_min = bcd2bin(alm_tm->tm_min);
260 else
261 alm_tm->tm_min = -1;
262
263 if (alm_en & S3C2410_RTCALM_HOUREN)
264 alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour);
265 else
266 alm_tm->tm_hour = -1;
267
268 if (alm_en & S3C2410_RTCALM_DAYEN)
269 alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday);
270 else
271 alm_tm->tm_mday = -1;
272
273 if (alm_en & S3C2410_RTCALM_MONEN) {
274 alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon);
275 alm_tm->tm_mon -= 1;
276 } else {
277 alm_tm->tm_mon = -1;
278 }
279
280 if (alm_en & S3C2410_RTCALM_YEAREN)
281 alm_tm->tm_year = bcd2bin(alm_tm->tm_year);
282 else
283 alm_tm->tm_year = -1;
284
285 return 0;
286 }
287
288 static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
289 {
290 struct s3c_rtc *info = dev_get_drvdata(dev);
291 struct rtc_time *tm = &alrm->time;
292 unsigned int alrm_en;
293
294 dev_dbg(dev, "s3c_rtc_setalarm: %d, %04d.%02d.%02d %02d:%02d:%02d\n",
295 alrm->enabled,
296 1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday,
297 tm->tm_hour, tm->tm_min, tm->tm_sec);
298
299 s3c_rtc_enable_clk(info);
300
301 alrm_en = readb(info->base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
302 writeb(0x00, info->base + S3C2410_RTCALM);
303
304 if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
305 alrm_en |= S3C2410_RTCALM_SECEN;
306 writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_ALMSEC);
307 }
308
309 if (tm->tm_min < 60 && tm->tm_min >= 0) {
310 alrm_en |= S3C2410_RTCALM_MINEN;
311 writeb(bin2bcd(tm->tm_min), info->base + S3C2410_ALMMIN);
312 }
313
314 if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
315 alrm_en |= S3C2410_RTCALM_HOUREN;
316 writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_ALMHOUR);
317 }
318
319 dev_dbg(dev, "setting S3C2410_RTCALM to %08x\n", alrm_en);
320
321 writeb(alrm_en, info->base + S3C2410_RTCALM);
322
323 s3c_rtc_disable_clk(info);
324
325 s3c_rtc_setaie(dev, alrm->enabled);
326
327 return 0;
328 }
329
330 static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
331 {
332 struct s3c_rtc *info = dev_get_drvdata(dev);
333
334 s3c_rtc_enable_clk(info);
335
336 if (info->data->enable_tick)
337 info->data->enable_tick(info, seq);
338
339 s3c_rtc_disable_clk(info);
340
341 return 0;
342 }
343
344 static const struct rtc_class_ops s3c_rtcops = {
345 .read_time = s3c_rtc_gettime,
346 .set_time = s3c_rtc_settime,
347 .read_alarm = s3c_rtc_getalarm,
348 .set_alarm = s3c_rtc_setalarm,
349 .proc = s3c_rtc_proc,
350 .alarm_irq_enable = s3c_rtc_setaie,
351 };
352
353 static void s3c24xx_rtc_enable(struct s3c_rtc *info)
354 {
355 unsigned int con, tmp;
356
357 con = readw(info->base + S3C2410_RTCCON);
358 /* re-enable the device, and check it is ok */
359 if ((con & S3C2410_RTCCON_RTCEN) == 0) {
360 dev_info(info->dev, "rtc disabled, re-enabling\n");
361
362 tmp = readw(info->base + S3C2410_RTCCON);
363 writew(tmp | S3C2410_RTCCON_RTCEN,
364 info->base + S3C2410_RTCCON);
365 }
366
367 if (con & S3C2410_RTCCON_CNTSEL) {
368 dev_info(info->dev, "removing RTCCON_CNTSEL\n");
369
370 tmp = readw(info->base + S3C2410_RTCCON);
371 writew(tmp & ~S3C2410_RTCCON_CNTSEL,
372 info->base + S3C2410_RTCCON);
373 }
374
375 if (con & S3C2410_RTCCON_CLKRST) {
376 dev_info(info->dev, "removing RTCCON_CLKRST\n");
377
378 tmp = readw(info->base + S3C2410_RTCCON);
379 writew(tmp & ~S3C2410_RTCCON_CLKRST,
380 info->base + S3C2410_RTCCON);
381 }
382 }
383
384 static void s3c24xx_rtc_disable(struct s3c_rtc *info)
385 {
386 unsigned int con;
387
388 con = readw(info->base + S3C2410_RTCCON);
389 con &= ~S3C2410_RTCCON_RTCEN;
390 writew(con, info->base + S3C2410_RTCCON);
391
392 con = readb(info->base + S3C2410_TICNT);
393 con &= ~S3C2410_TICNT_ENABLE;
394 writeb(con, info->base + S3C2410_TICNT);
395 }
396
397 static void s3c6410_rtc_disable(struct s3c_rtc *info)
398 {
399 unsigned int con;
400
401 con = readw(info->base + S3C2410_RTCCON);
402 con &= ~S3C64XX_RTCCON_TICEN;
403 con &= ~S3C2410_RTCCON_RTCEN;
404 writew(con, info->base + S3C2410_RTCCON);
405 }
406
407 static int s3c_rtc_remove(struct platform_device *pdev)
408 {
409 struct s3c_rtc *info = platform_get_drvdata(pdev);
410
411 s3c_rtc_setaie(info->dev, 0);
412
413 clk_unprepare(info->rtc_clk);
414 info->rtc_clk = NULL;
415
416 return 0;
417 }
418
419 static const struct of_device_id s3c_rtc_dt_match[];
420
421 static struct s3c_rtc_data *s3c_rtc_get_data(struct platform_device *pdev)
422 {
423 const struct of_device_id *match;
424
425 match = of_match_node(s3c_rtc_dt_match, pdev->dev.of_node);
426 return (struct s3c_rtc_data *)match->data;
427 }
428
429 static int s3c_rtc_probe(struct platform_device *pdev)
430 {
431 struct s3c_rtc *info = NULL;
432 struct rtc_time rtc_tm;
433 struct resource *res;
434 int ret;
435
436 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
437 if (!info)
438 return -ENOMEM;
439
440 /* find the IRQs */
441 info->irq_tick = platform_get_irq(pdev, 1);
442 if (info->irq_tick < 0) {
443 dev_err(&pdev->dev, "no irq for rtc tick\n");
444 return info->irq_tick;
445 }
446
447 info->dev = &pdev->dev;
448 info->data = s3c_rtc_get_data(pdev);
449 if (!info->data) {
450 dev_err(&pdev->dev, "failed getting s3c_rtc_data\n");
451 return -EINVAL;
452 }
453 spin_lock_init(&info->pie_lock);
454 spin_lock_init(&info->alarm_clk_lock);
455
456 platform_set_drvdata(pdev, info);
457
458 info->irq_alarm = platform_get_irq(pdev, 0);
459 if (info->irq_alarm < 0) {
460 dev_err(&pdev->dev, "no irq for alarm\n");
461 return info->irq_alarm;
462 }
463
464 dev_dbg(&pdev->dev, "s3c2410_rtc: tick irq %d, alarm irq %d\n",
465 info->irq_tick, info->irq_alarm);
466
467 /* get the memory region */
468 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
469 info->base = devm_ioremap_resource(&pdev->dev, res);
470 if (IS_ERR(info->base))
471 return PTR_ERR(info->base);
472
473 info->rtc_clk = devm_clk_get(&pdev->dev, "rtc");
474 if (IS_ERR(info->rtc_clk)) {
475 dev_err(&pdev->dev, "failed to find rtc clock\n");
476 return PTR_ERR(info->rtc_clk);
477 }
478 clk_prepare_enable(info->rtc_clk);
479
480 if (info->data->needs_src_clk) {
481 info->rtc_src_clk = devm_clk_get(&pdev->dev, "rtc_src");
482 if (IS_ERR(info->rtc_src_clk)) {
483 dev_err(&pdev->dev,
484 "failed to find rtc source clock\n");
485 return PTR_ERR(info->rtc_src_clk);
486 }
487 clk_prepare_enable(info->rtc_src_clk);
488 }
489
490 /* check to see if everything is setup correctly */
491 if (info->data->enable)
492 info->data->enable(info);
493
494 dev_dbg(&pdev->dev, "s3c2410_rtc: RTCCON=%02x\n",
495 readw(info->base + S3C2410_RTCCON));
496
497 device_init_wakeup(&pdev->dev, 1);
498
499 /* Check RTC Time */
500 if (s3c_rtc_gettime(&pdev->dev, &rtc_tm)) {
501 rtc_tm.tm_year = 100;
502 rtc_tm.tm_mon = 0;
503 rtc_tm.tm_mday = 1;
504 rtc_tm.tm_hour = 0;
505 rtc_tm.tm_min = 0;
506 rtc_tm.tm_sec = 0;
507
508 s3c_rtc_settime(&pdev->dev, &rtc_tm);
509
510 dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n");
511 }
512
513 /* register RTC and exit */
514 info->rtc = devm_rtc_device_register(&pdev->dev, "s3c", &s3c_rtcops,
515 THIS_MODULE);
516 if (IS_ERR(info->rtc)) {
517 dev_err(&pdev->dev, "cannot attach rtc\n");
518 ret = PTR_ERR(info->rtc);
519 goto err_nortc;
520 }
521
522 ret = devm_request_irq(&pdev->dev, info->irq_alarm, s3c_rtc_alarmirq,
523 0, "s3c2410-rtc alarm", info);
524 if (ret) {
525 dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_alarm, ret);
526 goto err_nortc;
527 }
528
529 ret = devm_request_irq(&pdev->dev, info->irq_tick, s3c_rtc_tickirq,
530 0, "s3c2410-rtc tick", info);
531 if (ret) {
532 dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_tick, ret);
533 goto err_nortc;
534 }
535
536 if (info->data->select_tick_clk)
537 info->data->select_tick_clk(info);
538
539 s3c_rtc_setfreq(info, 1);
540
541 s3c_rtc_disable_clk(info);
542
543 return 0;
544
545 err_nortc:
546 if (info->data->disable)
547 info->data->disable(info);
548
549 if (info->data->needs_src_clk)
550 clk_disable_unprepare(info->rtc_src_clk);
551 clk_disable_unprepare(info->rtc_clk);
552
553 return ret;
554 }
555
556 #ifdef CONFIG_PM_SLEEP
557
558 static int s3c_rtc_suspend(struct device *dev)
559 {
560 struct s3c_rtc *info = dev_get_drvdata(dev);
561
562 s3c_rtc_enable_clk(info);
563
564 /* save TICNT for anyone using periodic interrupts */
565 if (info->data->save_tick_cnt)
566 info->data->save_tick_cnt(info);
567
568 if (info->data->disable)
569 info->data->disable(info);
570
571 if (device_may_wakeup(dev) && !info->wake_en) {
572 if (enable_irq_wake(info->irq_alarm) == 0)
573 info->wake_en = true;
574 else
575 dev_err(dev, "enable_irq_wake failed\n");
576 }
577
578 return 0;
579 }
580
581 static int s3c_rtc_resume(struct device *dev)
582 {
583 struct s3c_rtc *info = dev_get_drvdata(dev);
584
585 if (info->data->enable)
586 info->data->enable(info);
587
588 if (info->data->restore_tick_cnt)
589 info->data->restore_tick_cnt(info);
590
591 s3c_rtc_disable_clk(info);
592
593 if (device_may_wakeup(dev) && info->wake_en) {
594 disable_irq_wake(info->irq_alarm);
595 info->wake_en = false;
596 }
597
598 return 0;
599 }
600 #endif
601 static SIMPLE_DEV_PM_OPS(s3c_rtc_pm_ops, s3c_rtc_suspend, s3c_rtc_resume);
602
603 static void s3c24xx_rtc_irq(struct s3c_rtc *info, int mask)
604 {
605 rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF);
606 }
607
608 static void s3c6410_rtc_irq(struct s3c_rtc *info, int mask)
609 {
610 rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF);
611 writeb(mask, info->base + S3C2410_INTP);
612 }
613
614 static void s3c2410_rtc_setfreq(struct s3c_rtc *info, int freq)
615 {
616 unsigned int tmp = 0;
617 int val;
618
619 tmp = readb(info->base + S3C2410_TICNT);
620 tmp &= S3C2410_TICNT_ENABLE;
621
622 val = (info->rtc->max_user_freq / freq) - 1;
623 tmp |= val;
624
625 writel(tmp, info->base + S3C2410_TICNT);
626 }
627
628 static void s3c2416_rtc_setfreq(struct s3c_rtc *info, int freq)
629 {
630 unsigned int tmp = 0;
631 int val;
632
633 tmp = readb(info->base + S3C2410_TICNT);
634 tmp &= S3C2410_TICNT_ENABLE;
635
636 val = (info->rtc->max_user_freq / freq) - 1;
637
638 tmp |= S3C2443_TICNT_PART(val);
639 writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1);
640
641 writel(S3C2416_TICNT2_PART(val), info->base + S3C2416_TICNT2);
642
643 writel(tmp, info->base + S3C2410_TICNT);
644 }
645
646 static void s3c2443_rtc_setfreq(struct s3c_rtc *info, int freq)
647 {
648 unsigned int tmp = 0;
649 int val;
650
651 tmp = readb(info->base + S3C2410_TICNT);
652 tmp &= S3C2410_TICNT_ENABLE;
653
654 val = (info->rtc->max_user_freq / freq) - 1;
655
656 tmp |= S3C2443_TICNT_PART(val);
657 writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1);
658
659 writel(tmp, info->base + S3C2410_TICNT);
660 }
661
662 static void s3c6410_rtc_setfreq(struct s3c_rtc *info, int freq)
663 {
664 int val;
665
666 val = (info->rtc->max_user_freq / freq) - 1;
667 writel(val, info->base + S3C2410_TICNT);
668 }
669
670 static void s3c24xx_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq)
671 {
672 unsigned int ticnt;
673
674 ticnt = readb(info->base + S3C2410_TICNT);
675 ticnt &= S3C2410_TICNT_ENABLE;
676
677 seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no");
678 }
679
680 static void s3c2416_rtc_select_tick_clk(struct s3c_rtc *info)
681 {
682 unsigned int con;
683
684 con = readw(info->base + S3C2410_RTCCON);
685 con |= S3C2443_RTCCON_TICSEL;
686 writew(con, info->base + S3C2410_RTCCON);
687 }
688
689 static void s3c6410_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq)
690 {
691 unsigned int ticnt;
692
693 ticnt = readw(info->base + S3C2410_RTCCON);
694 ticnt &= S3C64XX_RTCCON_TICEN;
695
696 seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no");
697 }
698
699 static void s3c24xx_rtc_save_tick_cnt(struct s3c_rtc *info)
700 {
701 info->ticnt_save = readb(info->base + S3C2410_TICNT);
702 }
703
704 static void s3c24xx_rtc_restore_tick_cnt(struct s3c_rtc *info)
705 {
706 writeb(info->ticnt_save, info->base + S3C2410_TICNT);
707 }
708
709 static void s3c6410_rtc_save_tick_cnt(struct s3c_rtc *info)
710 {
711 info->ticnt_en_save = readw(info->base + S3C2410_RTCCON);
712 info->ticnt_en_save &= S3C64XX_RTCCON_TICEN;
713 info->ticnt_save = readl(info->base + S3C2410_TICNT);
714 }
715
716 static void s3c6410_rtc_restore_tick_cnt(struct s3c_rtc *info)
717 {
718 unsigned int con;
719
720 writel(info->ticnt_save, info->base + S3C2410_TICNT);
721 if (info->ticnt_en_save) {
722 con = readw(info->base + S3C2410_RTCCON);
723 writew(con | info->ticnt_en_save,
724 info->base + S3C2410_RTCCON);
725 }
726 }
727
728 static struct s3c_rtc_data const s3c2410_rtc_data = {
729 .max_user_freq = 128,
730 .irq_handler = s3c24xx_rtc_irq,
731 .set_freq = s3c2410_rtc_setfreq,
732 .enable_tick = s3c24xx_rtc_enable_tick,
733 .save_tick_cnt = s3c24xx_rtc_save_tick_cnt,
734 .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt,
735 .enable = s3c24xx_rtc_enable,
736 .disable = s3c24xx_rtc_disable,
737 };
738
739 static struct s3c_rtc_data const s3c2416_rtc_data = {
740 .max_user_freq = 32768,
741 .irq_handler = s3c24xx_rtc_irq,
742 .set_freq = s3c2416_rtc_setfreq,
743 .enable_tick = s3c24xx_rtc_enable_tick,
744 .select_tick_clk = s3c2416_rtc_select_tick_clk,
745 .save_tick_cnt = s3c24xx_rtc_save_tick_cnt,
746 .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt,
747 .enable = s3c24xx_rtc_enable,
748 .disable = s3c24xx_rtc_disable,
749 };
750
751 static struct s3c_rtc_data const s3c2443_rtc_data = {
752 .max_user_freq = 32768,
753 .irq_handler = s3c24xx_rtc_irq,
754 .set_freq = s3c2443_rtc_setfreq,
755 .enable_tick = s3c24xx_rtc_enable_tick,
756 .select_tick_clk = s3c2416_rtc_select_tick_clk,
757 .save_tick_cnt = s3c24xx_rtc_save_tick_cnt,
758 .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt,
759 .enable = s3c24xx_rtc_enable,
760 .disable = s3c24xx_rtc_disable,
761 };
762
763 static struct s3c_rtc_data const s3c6410_rtc_data = {
764 .max_user_freq = 32768,
765 .needs_src_clk = true,
766 .irq_handler = s3c6410_rtc_irq,
767 .set_freq = s3c6410_rtc_setfreq,
768 .enable_tick = s3c6410_rtc_enable_tick,
769 .save_tick_cnt = s3c6410_rtc_save_tick_cnt,
770 .restore_tick_cnt = s3c6410_rtc_restore_tick_cnt,
771 .enable = s3c24xx_rtc_enable,
772 .disable = s3c6410_rtc_disable,
773 };
774
775 static const struct of_device_id s3c_rtc_dt_match[] = {
776 {
777 .compatible = "samsung,s3c2410-rtc",
778 .data = (void *)&s3c2410_rtc_data,
779 }, {
780 .compatible = "samsung,s3c2416-rtc",
781 .data = (void *)&s3c2416_rtc_data,
782 }, {
783 .compatible = "samsung,s3c2443-rtc",
784 .data = (void *)&s3c2443_rtc_data,
785 }, {
786 .compatible = "samsung,s3c6410-rtc",
787 .data = (void *)&s3c6410_rtc_data,
788 }, {
789 .compatible = "samsung,exynos3250-rtc",
790 .data = (void *)&s3c6410_rtc_data,
791 },
792 { /* sentinel */ },
793 };
794 MODULE_DEVICE_TABLE(of, s3c_rtc_dt_match);
795
796 static struct platform_driver s3c_rtc_driver = {
797 .probe = s3c_rtc_probe,
798 .remove = s3c_rtc_remove,
799 .driver = {
800 .name = "s3c-rtc",
801 .pm = &s3c_rtc_pm_ops,
802 .of_match_table = of_match_ptr(s3c_rtc_dt_match),
803 },
804 };
805 module_platform_driver(s3c_rtc_driver);
806
807 MODULE_DESCRIPTION("Samsung S3C RTC Driver");
808 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
809 MODULE_LICENSE("GPL");
810 MODULE_ALIAS("platform:s3c2410-rtc");
Linux kernel - Deliverables
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