tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
35struct 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 bool clk_disabled;
43
44 const struct s3c_rtc_data *data;
45
46 int irq_alarm;
47 int irq_tick;
48
49 spinlock_t pie_lock;
50 spinlock_t alarm_clk_lock;
51
52 int ticnt_save;
53 int ticnt_en_save;
54 bool wake_en;
55};
56
57struct s3c_rtc_data {
58 int max_user_freq;
59 bool needs_src_clk;
60
61 void (*irq_handler) (struct s3c_rtc *info, int mask);
62 void (*set_freq) (struct s3c_rtc *info, int freq);
63 void (*enable_tick) (struct s3c_rtc *info, struct seq_file *seq);
64 void (*select_tick_clk) (struct s3c_rtc *info);
65 void (*save_tick_cnt) (struct s3c_rtc *info);
66 void (*restore_tick_cnt) (struct s3c_rtc *info);
67 void (*enable) (struct s3c_rtc *info);
68 void (*disable) (struct s3c_rtc *info);
69};
70
71static int s3c_rtc_enable_clk(struct s3c_rtc *info)
72{
73 unsigned long irq_flags;
74 int ret = 0;
75
76 spin_lock_irqsave(&info->alarm_clk_lock, irq_flags);
77
78 if (info->clk_disabled) {
79 ret = clk_enable(info->rtc_clk);
80 if (ret)
81 goto out;
82
83 if (info->data->needs_src_clk) {
84 ret = clk_enable(info->rtc_src_clk);
85 if (ret) {
86 clk_disable(info->rtc_clk);
87 goto out;
88 }
89 }
90 info->clk_disabled = false;
91 }
92
93out:
94 spin_unlock_irqrestore(&info->alarm_clk_lock, irq_flags);
95
96 return ret;
97}
98
99static void s3c_rtc_disable_clk(struct s3c_rtc *info)
100{
101 unsigned long irq_flags;
102
103 spin_lock_irqsave(&info->alarm_clk_lock, irq_flags);
104 if (!info->clk_disabled) {
105 if (info->data->needs_src_clk)
106 clk_disable(info->rtc_src_clk);
107 clk_disable(info->rtc_clk);
108 info->clk_disabled = true;
109 }
110 spin_unlock_irqrestore(&info->alarm_clk_lock, irq_flags);
111}
112
113/* IRQ Handlers */
114static irqreturn_t s3c_rtc_tickirq(int irq, void *id)
115{
116 struct s3c_rtc *info = (struct s3c_rtc *)id;
117
118 if (info->data->irq_handler)
119 info->data->irq_handler(info, S3C2410_INTP_TIC);
120
121 return IRQ_HANDLED;
122}
123
124static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)
125{
126 struct s3c_rtc *info = (struct s3c_rtc *)id;
127
128 if (info->data->irq_handler)
129 info->data->irq_handler(info, S3C2410_INTP_ALM);
130
131 return IRQ_HANDLED;
132}
133
134/* Update control registers */
135static int s3c_rtc_setaie(struct device *dev, unsigned int enabled)
136{
137 struct s3c_rtc *info = dev_get_drvdata(dev);
138 unsigned int tmp;
139 int ret;
140
141 dev_dbg(info->dev, "%s: aie=%d\n", __func__, enabled);
142
143 ret = s3c_rtc_enable_clk(info);
144 if (ret)
145 return ret;
146
147 tmp = readb(info->base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
148
149 if (enabled)
150 tmp |= S3C2410_RTCALM_ALMEN;
151
152 writeb(tmp, info->base + S3C2410_RTCALM);
153
154 s3c_rtc_disable_clk(info);
155
156 if (enabled) {
157 ret = s3c_rtc_enable_clk(info);
158 if (ret)
159 return ret;
160 } else {
161 s3c_rtc_disable_clk(info);
162 }
163
164 return 0;
165}
166
167/* Set RTC frequency */
168static int s3c_rtc_setfreq(struct s3c_rtc *info, int freq)
169{
170 int ret;
171
172 if (!is_power_of_2(freq))
173 return -EINVAL;
174
175 ret = s3c_rtc_enable_clk(info);
176 if (ret)
177 return ret;
178 spin_lock_irq(&info->pie_lock);
179
180 if (info->data->set_freq)
181 info->data->set_freq(info, freq);
182
183 spin_unlock_irq(&info->pie_lock);
184 s3c_rtc_disable_clk(info);
185
186 return 0;
187}
188
189/* Time read/write */
190static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
191{
192 struct s3c_rtc *info = dev_get_drvdata(dev);
193 unsigned int have_retried = 0;
194 int ret;
195
196 ret = s3c_rtc_enable_clk(info);
197 if (ret)
198 return ret;
199
200retry_get_time:
201 rtc_tm->tm_min = readb(info->base + S3C2410_RTCMIN);
202 rtc_tm->tm_hour = readb(info->base + S3C2410_RTCHOUR);
203 rtc_tm->tm_mday = readb(info->base + S3C2410_RTCDATE);
204 rtc_tm->tm_mon = readb(info->base + S3C2410_RTCMON);
205 rtc_tm->tm_year = readb(info->base + S3C2410_RTCYEAR);
206 rtc_tm->tm_sec = readb(info->base + S3C2410_RTCSEC);
207
208 /* the only way to work out whether the system was mid-update
209 * when we read it is to check the second counter, and if it
210 * is zero, then we re-try the entire read
211 */
212
213 if (rtc_tm->tm_sec == 0 && !have_retried) {
214 have_retried = 1;
215 goto retry_get_time;
216 }
217
218 rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
219 rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
220 rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
221 rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
222 rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
223 rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);
224
225 s3c_rtc_disable_clk(info);
226
227 rtc_tm->tm_year += 100;
228 rtc_tm->tm_mon -= 1;
229
230 dev_dbg(dev, "read time %ptR\n", rtc_tm);
231 return 0;
232}
233
234static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
235{
236 struct s3c_rtc *info = dev_get_drvdata(dev);
237 int year = tm->tm_year - 100;
238 int ret;
239
240 dev_dbg(dev, "set time %ptR\n", tm);
241
242 /* we get around y2k by simply not supporting it */
243
244 if (year < 0 || year >= 100) {
245 dev_err(dev, "rtc only supports 100 years\n");
246 return -EINVAL;
247 }
248
249 ret = s3c_rtc_enable_clk(info);
250 if (ret)
251 return ret;
252
253 writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_RTCSEC);
254 writeb(bin2bcd(tm->tm_min), info->base + S3C2410_RTCMIN);
255 writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_RTCHOUR);
256 writeb(bin2bcd(tm->tm_mday), info->base + S3C2410_RTCDATE);
257 writeb(bin2bcd(tm->tm_mon + 1), info->base + S3C2410_RTCMON);
258 writeb(bin2bcd(year), info->base + S3C2410_RTCYEAR);
259
260 s3c_rtc_disable_clk(info);
261
262 return 0;
263}
264
265static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
266{
267 struct s3c_rtc *info = dev_get_drvdata(dev);
268 struct rtc_time *alm_tm = &alrm->time;
269 unsigned int alm_en;
270 int ret;
271
272 ret = s3c_rtc_enable_clk(info);
273 if (ret)
274 return ret;
275
276 alm_tm->tm_sec = readb(info->base + S3C2410_ALMSEC);
277 alm_tm->tm_min = readb(info->base + S3C2410_ALMMIN);
278 alm_tm->tm_hour = readb(info->base + S3C2410_ALMHOUR);
279 alm_tm->tm_mon = readb(info->base + S3C2410_ALMMON);
280 alm_tm->tm_mday = readb(info->base + S3C2410_ALMDATE);
281 alm_tm->tm_year = readb(info->base + S3C2410_ALMYEAR);
282
283 alm_en = readb(info->base + S3C2410_RTCALM);
284
285 s3c_rtc_disable_clk(info);
286
287 alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0;
288
289 dev_dbg(dev, "read alarm %d, %ptR\n", alm_en, alm_tm);
290
291 /* decode the alarm enable field */
292 if (alm_en & S3C2410_RTCALM_SECEN)
293 alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec);
294
295 if (alm_en & S3C2410_RTCALM_MINEN)
296 alm_tm->tm_min = bcd2bin(alm_tm->tm_min);
297
298 if (alm_en & S3C2410_RTCALM_HOUREN)
299 alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour);
300
301 if (alm_en & S3C2410_RTCALM_DAYEN)
302 alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday);
303
304 if (alm_en & S3C2410_RTCALM_MONEN) {
305 alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon);
306 alm_tm->tm_mon -= 1;
307 }
308
309 if (alm_en & S3C2410_RTCALM_YEAREN)
310 alm_tm->tm_year = bcd2bin(alm_tm->tm_year);
311
312 return 0;
313}
314
315static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
316{
317 struct s3c_rtc *info = dev_get_drvdata(dev);
318 struct rtc_time *tm = &alrm->time;
319 unsigned int alrm_en;
320 int ret;
321
322 dev_dbg(dev, "s3c_rtc_setalarm: %d, %ptR\n", alrm->enabled, tm);
323
324 ret = s3c_rtc_enable_clk(info);
325 if (ret)
326 return ret;
327
328 alrm_en = readb(info->base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
329 writeb(0x00, info->base + S3C2410_RTCALM);
330
331 if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
332 alrm_en |= S3C2410_RTCALM_SECEN;
333 writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_ALMSEC);
334 }
335
336 if (tm->tm_min < 60 && tm->tm_min >= 0) {
337 alrm_en |= S3C2410_RTCALM_MINEN;
338 writeb(bin2bcd(tm->tm_min), info->base + S3C2410_ALMMIN);
339 }
340
341 if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
342 alrm_en |= S3C2410_RTCALM_HOUREN;
343 writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_ALMHOUR);
344 }
345
346 if (tm->tm_mon < 12 && tm->tm_mon >= 0) {
347 alrm_en |= S3C2410_RTCALM_MONEN;
348 writeb(bin2bcd(tm->tm_mon + 1), info->base + S3C2410_ALMMON);
349 }
350
351 if (tm->tm_mday <= 31 && tm->tm_mday >= 1) {
352 alrm_en |= S3C2410_RTCALM_DAYEN;
353 writeb(bin2bcd(tm->tm_mday), info->base + S3C2410_ALMDATE);
354 }
355
356 dev_dbg(dev, "setting S3C2410_RTCALM to %08x\n", alrm_en);
357
358 writeb(alrm_en, info->base + S3C2410_RTCALM);
359
360 s3c_rtc_disable_clk(info);
361
362 s3c_rtc_setaie(dev, alrm->enabled);
363
364 return 0;
365}
366
367static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
368{
369 struct s3c_rtc *info = dev_get_drvdata(dev);
370 int ret;
371
372 ret = s3c_rtc_enable_clk(info);
373 if (ret)
374 return ret;
375
376 if (info->data->enable_tick)
377 info->data->enable_tick(info, seq);
378
379 s3c_rtc_disable_clk(info);
380
381 return 0;
382}
383
384static const struct rtc_class_ops s3c_rtcops = {
385 .read_time = s3c_rtc_gettime,
386 .set_time = s3c_rtc_settime,
387 .read_alarm = s3c_rtc_getalarm,
388 .set_alarm = s3c_rtc_setalarm,
389 .proc = s3c_rtc_proc,
390 .alarm_irq_enable = s3c_rtc_setaie,
391};
392
393static void s3c24xx_rtc_enable(struct s3c_rtc *info)
394{
395 unsigned int con, tmp;
396
397 con = readw(info->base + S3C2410_RTCCON);
398 /* re-enable the device, and check it is ok */
399 if ((con & S3C2410_RTCCON_RTCEN) == 0) {
400 dev_info(info->dev, "rtc disabled, re-enabling\n");
401
402 tmp = readw(info->base + S3C2410_RTCCON);
403 writew(tmp | S3C2410_RTCCON_RTCEN, info->base + S3C2410_RTCCON);
404 }
405
406 if (con & S3C2410_RTCCON_CNTSEL) {
407 dev_info(info->dev, "removing RTCCON_CNTSEL\n");
408
409 tmp = readw(info->base + S3C2410_RTCCON);
410 writew(tmp & ~S3C2410_RTCCON_CNTSEL,
411 info->base + S3C2410_RTCCON);
412 }
413
414 if (con & S3C2410_RTCCON_CLKRST) {
415 dev_info(info->dev, "removing RTCCON_CLKRST\n");
416
417 tmp = readw(info->base + S3C2410_RTCCON);
418 writew(tmp & ~S3C2410_RTCCON_CLKRST,
419 info->base + S3C2410_RTCCON);
420 }
421}
422
423static void s3c24xx_rtc_disable(struct s3c_rtc *info)
424{
425 unsigned int con;
426
427 con = readw(info->base + S3C2410_RTCCON);
428 con &= ~S3C2410_RTCCON_RTCEN;
429 writew(con, info->base + S3C2410_RTCCON);
430
431 con = readb(info->base + S3C2410_TICNT);
432 con &= ~S3C2410_TICNT_ENABLE;
433 writeb(con, info->base + S3C2410_TICNT);
434}
435
436static void s3c6410_rtc_disable(struct s3c_rtc *info)
437{
438 unsigned int con;
439
440 con = readw(info->base + S3C2410_RTCCON);
441 con &= ~S3C64XX_RTCCON_TICEN;
442 con &= ~S3C2410_RTCCON_RTCEN;
443 writew(con, info->base + S3C2410_RTCCON);
444}
445
446static int s3c_rtc_remove(struct platform_device *pdev)
447{
448 struct s3c_rtc *info = platform_get_drvdata(pdev);
449
450 s3c_rtc_setaie(info->dev, 0);
451
452 if (info->data->needs_src_clk)
453 clk_unprepare(info->rtc_src_clk);
454 clk_unprepare(info->rtc_clk);
455
456 return 0;
457}
458
459static const struct of_device_id s3c_rtc_dt_match[];
460
461static const struct s3c_rtc_data *s3c_rtc_get_data(struct platform_device *pdev)
462{
463 const struct of_device_id *match;
464
465 match = of_match_node(s3c_rtc_dt_match, pdev->dev.of_node);
466 return match->data;
467}
468
469static int s3c_rtc_probe(struct platform_device *pdev)
470{
471 struct s3c_rtc *info = NULL;
472 struct rtc_time rtc_tm;
473 struct resource *res;
474 int ret;
475
476 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
477 if (!info)
478 return -ENOMEM;
479
480 /* find the IRQs */
481 info->irq_tick = platform_get_irq(pdev, 1);
482 if (info->irq_tick < 0) {
483 dev_err(&pdev->dev, "no irq for rtc tick\n");
484 return info->irq_tick;
485 }
486
487 info->dev = &pdev->dev;
488 info->data = s3c_rtc_get_data(pdev);
489 if (!info->data) {
490 dev_err(&pdev->dev, "failed getting s3c_rtc_data\n");
491 return -EINVAL;
492 }
493 spin_lock_init(&info->pie_lock);
494 spin_lock_init(&info->alarm_clk_lock);
495
496 platform_set_drvdata(pdev, info);
497
498 info->irq_alarm = platform_get_irq(pdev, 0);
499 if (info->irq_alarm < 0) {
500 dev_err(&pdev->dev, "no irq for alarm\n");
501 return info->irq_alarm;
502 }
503
504 dev_dbg(&pdev->dev, "s3c2410_rtc: tick irq %d, alarm irq %d\n",
505 info->irq_tick, info->irq_alarm);
506
507 /* get the memory region */
508 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
509 info->base = devm_ioremap_resource(&pdev->dev, res);
510 if (IS_ERR(info->base))
511 return PTR_ERR(info->base);
512
513 info->rtc_clk = devm_clk_get(&pdev->dev, "rtc");
514 if (IS_ERR(info->rtc_clk)) {
515 ret = PTR_ERR(info->rtc_clk);
516 if (ret != -EPROBE_DEFER)
517 dev_err(&pdev->dev, "failed to find rtc clock\n");
518 else
519 dev_dbg(&pdev->dev, "probe deferred due to missing rtc clk\n");
520 return ret;
521 }
522 ret = clk_prepare_enable(info->rtc_clk);
523 if (ret)
524 return ret;
525
526 if (info->data->needs_src_clk) {
527 info->rtc_src_clk = devm_clk_get(&pdev->dev, "rtc_src");
528 if (IS_ERR(info->rtc_src_clk)) {
529 ret = PTR_ERR(info->rtc_src_clk);
530 if (ret != -EPROBE_DEFER)
531 dev_err(&pdev->dev,
532 "failed to find rtc source clock\n");
533 else
534 dev_dbg(&pdev->dev,
535 "probe deferred due to missing rtc src clk\n");
536 goto err_src_clk;
537 }
538 ret = clk_prepare_enable(info->rtc_src_clk);
539 if (ret)
540 goto err_src_clk;
541 }
542
543 /* check to see if everything is setup correctly */
544 if (info->data->enable)
545 info->data->enable(info);
546
547 dev_dbg(&pdev->dev, "s3c2410_rtc: RTCCON=%02x\n",
548 readw(info->base + S3C2410_RTCCON));
549
550 device_init_wakeup(&pdev->dev, 1);
551
552 /* Check RTC Time */
553 if (s3c_rtc_gettime(&pdev->dev, &rtc_tm)) {
554 rtc_tm.tm_year = 100;
555 rtc_tm.tm_mon = 0;
556 rtc_tm.tm_mday = 1;
557 rtc_tm.tm_hour = 0;
558 rtc_tm.tm_min = 0;
559 rtc_tm.tm_sec = 0;
560
561 s3c_rtc_settime(&pdev->dev, &rtc_tm);
562
563 dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n");
564 }
565
566 /* register RTC and exit */
567 info->rtc = devm_rtc_device_register(&pdev->dev, "s3c", &s3c_rtcops,
568 THIS_MODULE);
569 if (IS_ERR(info->rtc)) {
570 dev_err(&pdev->dev, "cannot attach rtc\n");
571 ret = PTR_ERR(info->rtc);
572 goto err_nortc;
573 }
574
575 ret = devm_request_irq(&pdev->dev, info->irq_alarm, s3c_rtc_alarmirq,
576 0, "s3c2410-rtc alarm", info);
577 if (ret) {
578 dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_alarm, ret);
579 goto err_nortc;
580 }
581
582 ret = devm_request_irq(&pdev->dev, info->irq_tick, s3c_rtc_tickirq,
583 0, "s3c2410-rtc tick", info);
584 if (ret) {
585 dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_tick, ret);
586 goto err_nortc;
587 }
588
589 if (info->data->select_tick_clk)
590 info->data->select_tick_clk(info);
591
592 s3c_rtc_setfreq(info, 1);
593
594 return 0;
595
596err_nortc:
597 if (info->data->disable)
598 info->data->disable(info);
599
600 if (info->data->needs_src_clk)
601 clk_disable_unprepare(info->rtc_src_clk);
602err_src_clk:
603 clk_disable_unprepare(info->rtc_clk);
604
605 return ret;
606}
607
608#ifdef CONFIG_PM_SLEEP
609
610static int s3c_rtc_suspend(struct device *dev)
611{
612 struct s3c_rtc *info = dev_get_drvdata(dev);
613 int ret;
614
615 ret = s3c_rtc_enable_clk(info);
616 if (ret)
617 return ret;
618
619 /* save TICNT for anyone using periodic interrupts */
620 if (info->data->save_tick_cnt)
621 info->data->save_tick_cnt(info);
622
623 if (info->data->disable)
624 info->data->disable(info);
625
626 if (device_may_wakeup(dev) && !info->wake_en) {
627 if (enable_irq_wake(info->irq_alarm) == 0)
628 info->wake_en = true;
629 else
630 dev_err(dev, "enable_irq_wake failed\n");
631 }
632
633 return 0;
634}
635
636static int s3c_rtc_resume(struct device *dev)
637{
638 struct s3c_rtc *info = dev_get_drvdata(dev);
639
640 if (info->data->enable)
641 info->data->enable(info);
642
643 if (info->data->restore_tick_cnt)
644 info->data->restore_tick_cnt(info);
645
646 s3c_rtc_disable_clk(info);
647
648 if (device_may_wakeup(dev) && info->wake_en) {
649 disable_irq_wake(info->irq_alarm);
650 info->wake_en = false;
651 }
652
653 return 0;
654}
655#endif
656static SIMPLE_DEV_PM_OPS(s3c_rtc_pm_ops, s3c_rtc_suspend, s3c_rtc_resume);
657
658static void s3c24xx_rtc_irq(struct s3c_rtc *info, int mask)
659{
660 rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF);
661}
662
663static void s3c6410_rtc_irq(struct s3c_rtc *info, int mask)
664{
665 rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF);
666 writeb(mask, info->base + S3C2410_INTP);
667}
668
669static void s3c2410_rtc_setfreq(struct s3c_rtc *info, int freq)
670{
671 unsigned int tmp = 0;
672 int val;
673
674 tmp = readb(info->base + S3C2410_TICNT);
675 tmp &= S3C2410_TICNT_ENABLE;
676
677 val = (info->rtc->max_user_freq / freq) - 1;
678 tmp |= val;
679
680 writel(tmp, info->base + S3C2410_TICNT);
681}
682
683static void s3c2416_rtc_setfreq(struct s3c_rtc *info, int freq)
684{
685 unsigned int tmp = 0;
686 int val;
687
688 tmp = readb(info->base + S3C2410_TICNT);
689 tmp &= S3C2410_TICNT_ENABLE;
690
691 val = (info->rtc->max_user_freq / freq) - 1;
692
693 tmp |= S3C2443_TICNT_PART(val);
694 writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1);
695
696 writel(S3C2416_TICNT2_PART(val), info->base + S3C2416_TICNT2);
697
698 writel(tmp, info->base + S3C2410_TICNT);
699}
700
701static void s3c2443_rtc_setfreq(struct s3c_rtc *info, int freq)
702{
703 unsigned int tmp = 0;
704 int val;
705
706 tmp = readb(info->base + S3C2410_TICNT);
707 tmp &= S3C2410_TICNT_ENABLE;
708
709 val = (info->rtc->max_user_freq / freq) - 1;
710
711 tmp |= S3C2443_TICNT_PART(val);
712 writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1);
713
714 writel(tmp, info->base + S3C2410_TICNT);
715}
716
717static void s3c6410_rtc_setfreq(struct s3c_rtc *info, int freq)
718{
719 int val;
720
721 val = (info->rtc->max_user_freq / freq) - 1;
722 writel(val, info->base + S3C2410_TICNT);
723}
724
725static void s3c24xx_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq)
726{
727 unsigned int ticnt;
728
729 ticnt = readb(info->base + S3C2410_TICNT);
730 ticnt &= S3C2410_TICNT_ENABLE;
731
732 seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no");
733}
734
735static void s3c2416_rtc_select_tick_clk(struct s3c_rtc *info)
736{
737 unsigned int con;
738
739 con = readw(info->base + S3C2410_RTCCON);
740 con |= S3C2443_RTCCON_TICSEL;
741 writew(con, info->base + S3C2410_RTCCON);
742}
743
744static void s3c6410_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq)
745{
746 unsigned int ticnt;
747
748 ticnt = readw(info->base + S3C2410_RTCCON);
749 ticnt &= S3C64XX_RTCCON_TICEN;
750
751 seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no");
752}
753
754static void s3c24xx_rtc_save_tick_cnt(struct s3c_rtc *info)
755{
756 info->ticnt_save = readb(info->base + S3C2410_TICNT);
757}
758
759static void s3c24xx_rtc_restore_tick_cnt(struct s3c_rtc *info)
760{
761 writeb(info->ticnt_save, info->base + S3C2410_TICNT);
762}
763
764static void s3c6410_rtc_save_tick_cnt(struct s3c_rtc *info)
765{
766 info->ticnt_en_save = readw(info->base + S3C2410_RTCCON);
767 info->ticnt_en_save &= S3C64XX_RTCCON_TICEN;
768 info->ticnt_save = readl(info->base + S3C2410_TICNT);
769}
770
771static void s3c6410_rtc_restore_tick_cnt(struct s3c_rtc *info)
772{
773 unsigned int con;
774
775 writel(info->ticnt_save, info->base + S3C2410_TICNT);
776 if (info->ticnt_en_save) {
777 con = readw(info->base + S3C2410_RTCCON);
778 writew(con | info->ticnt_en_save, info->base + S3C2410_RTCCON);
779 }
780}
781
782static struct s3c_rtc_data const s3c2410_rtc_data = {
783 .max_user_freq = 128,
784 .irq_handler = s3c24xx_rtc_irq,
785 .set_freq = s3c2410_rtc_setfreq,
786 .enable_tick = s3c24xx_rtc_enable_tick,
787 .save_tick_cnt = s3c24xx_rtc_save_tick_cnt,
788 .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt,
789 .enable = s3c24xx_rtc_enable,
790 .disable = s3c24xx_rtc_disable,
791};
792
793static struct s3c_rtc_data const s3c2416_rtc_data = {
794 .max_user_freq = 32768,
795 .irq_handler = s3c24xx_rtc_irq,
796 .set_freq = s3c2416_rtc_setfreq,
797 .enable_tick = s3c24xx_rtc_enable_tick,
798 .select_tick_clk = s3c2416_rtc_select_tick_clk,
799 .save_tick_cnt = s3c24xx_rtc_save_tick_cnt,
800 .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt,
801 .enable = s3c24xx_rtc_enable,
802 .disable = s3c24xx_rtc_disable,
803};
804
805static struct s3c_rtc_data const s3c2443_rtc_data = {
806 .max_user_freq = 32768,
807 .irq_handler = s3c24xx_rtc_irq,
808 .set_freq = s3c2443_rtc_setfreq,
809 .enable_tick = s3c24xx_rtc_enable_tick,
810 .select_tick_clk = s3c2416_rtc_select_tick_clk,
811 .save_tick_cnt = s3c24xx_rtc_save_tick_cnt,
812 .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt,
813 .enable = s3c24xx_rtc_enable,
814 .disable = s3c24xx_rtc_disable,
815};
816
817static struct s3c_rtc_data const s3c6410_rtc_data = {
818 .max_user_freq = 32768,
819 .needs_src_clk = true,
820 .irq_handler = s3c6410_rtc_irq,
821 .set_freq = s3c6410_rtc_setfreq,
822 .enable_tick = s3c6410_rtc_enable_tick,
823 .save_tick_cnt = s3c6410_rtc_save_tick_cnt,
824 .restore_tick_cnt = s3c6410_rtc_restore_tick_cnt,
825 .enable = s3c24xx_rtc_enable,
826 .disable = s3c6410_rtc_disable,
827};
828
829static const struct of_device_id s3c_rtc_dt_match[] = {
830 {
831 .compatible = "samsung,s3c2410-rtc",
832 .data = &s3c2410_rtc_data,
833 }, {
834 .compatible = "samsung,s3c2416-rtc",
835 .data = &s3c2416_rtc_data,
836 }, {
837 .compatible = "samsung,s3c2443-rtc",
838 .data = &s3c2443_rtc_data,
839 }, {
840 .compatible = "samsung,s3c6410-rtc",
841 .data = &s3c6410_rtc_data,
842 }, {
843 .compatible = "samsung,exynos3250-rtc",
844 .data = &s3c6410_rtc_data,
845 },
846 { /* sentinel */ },
847};
848MODULE_DEVICE_TABLE(of, s3c_rtc_dt_match);
849
850static struct platform_driver s3c_rtc_driver = {
851 .probe = s3c_rtc_probe,
852 .remove = s3c_rtc_remove,
853 .driver = {
854 .name = "s3c-rtc",
855 .pm = &s3c_rtc_pm_ops,
856 .of_match_table = of_match_ptr(s3c_rtc_dt_match),
857 },
858};
859module_platform_driver(s3c_rtc_driver);
860
861MODULE_DESCRIPTION("Samsung S3C RTC Driver");
862MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
863MODULE_LICENSE("GPL");
864MODULE_ALIAS("platform:s3c2410-rtc");