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 bool clk_disabled;
43
44 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, ticnt_en_save;
53 bool wake_en;
54 };
55
56 struct s3c_rtc_data {
57 int max_user_freq;
58 bool needs_src_clk;
59
60 void (*irq_handler) (struct s3c_rtc *info, int mask);
61 void (*set_freq) (struct s3c_rtc *info, int freq);
62 void (*enable_tick) (struct s3c_rtc *info, struct seq_file *seq);
63 void (*select_tick_clk) (struct s3c_rtc *info);
64 void (*save_tick_cnt) (struct s3c_rtc *info);
65 void (*restore_tick_cnt) (struct s3c_rtc *info);
66 void (*enable) (struct s3c_rtc *info);
67 void (*disable) (struct s3c_rtc *info);
68 };
69
s3c_rtc_enable_clk(struct s3c_rtc * info)70 static void s3c_rtc_enable_clk(struct s3c_rtc *info)
71 {
72 unsigned long irq_flags;
73
74 spin_lock_irqsave(&info->alarm_clk_lock, irq_flags);
75 if (info->clk_disabled) {
76 clk_enable(info->rtc_clk);
77 if (info->data->needs_src_clk)
78 clk_enable(info->rtc_src_clk);
79 info->clk_disabled = false;
80 }
81 spin_unlock_irqrestore(&info->alarm_clk_lock, irq_flags);
82 }
83
s3c_rtc_disable_clk(struct s3c_rtc * info)84 static void s3c_rtc_disable_clk(struct s3c_rtc *info)
85 {
86 unsigned long irq_flags;
87
88 spin_lock_irqsave(&info->alarm_clk_lock, irq_flags);
89 if (!info->clk_disabled) {
90 if (info->data->needs_src_clk)
91 clk_disable(info->rtc_src_clk);
92 clk_disable(info->rtc_clk);
93 info->clk_disabled = true;
94 }
95 spin_unlock_irqrestore(&info->alarm_clk_lock, irq_flags);
96 }
97
98 /* IRQ Handlers */
s3c_rtc_tickirq(int irq,void * id)99 static irqreturn_t s3c_rtc_tickirq(int irq, void *id)
100 {
101 struct s3c_rtc *info = (struct s3c_rtc *)id;
102
103 if (info->data->irq_handler)
104 info->data->irq_handler(info, S3C2410_INTP_TIC);
105
106 return IRQ_HANDLED;
107 }
108
s3c_rtc_alarmirq(int irq,void * id)109 static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)
110 {
111 struct s3c_rtc *info = (struct s3c_rtc *)id;
112
113 if (info->data->irq_handler)
114 info->data->irq_handler(info, S3C2410_INTP_ALM);
115
116 return IRQ_HANDLED;
117 }
118
119 /* Update control registers */
s3c_rtc_setaie(struct device * dev,unsigned int enabled)120 static int s3c_rtc_setaie(struct device *dev, unsigned int enabled)
121 {
122 struct s3c_rtc *info = dev_get_drvdata(dev);
123 unsigned int tmp;
124
125 dev_dbg(info->dev, "%s: aie=%d\n", __func__, enabled);
126
127 s3c_rtc_enable_clk(info);
128
129 tmp = readb(info->base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
130
131 if (enabled)
132 tmp |= S3C2410_RTCALM_ALMEN;
133
134 writeb(tmp, info->base + S3C2410_RTCALM);
135
136 s3c_rtc_disable_clk(info);
137
138 if (enabled)
139 s3c_rtc_enable_clk(info);
140 else
141 s3c_rtc_disable_clk(info);
142
143 return 0;
144 }
145
146 /* Set RTC frequency */
s3c_rtc_setfreq(struct s3c_rtc * info,int freq)147 static int s3c_rtc_setfreq(struct s3c_rtc *info, int freq)
148 {
149 if (!is_power_of_2(freq))
150 return -EINVAL;
151
152 spin_lock_irq(&info->pie_lock);
153
154 if (info->data->set_freq)
155 info->data->set_freq(info, freq);
156
157 spin_unlock_irq(&info->pie_lock);
158
159 return 0;
160 }
161
162 /* Time read/write */
s3c_rtc_gettime(struct device * dev,struct rtc_time * rtc_tm)163 static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
164 {
165 struct s3c_rtc *info = dev_get_drvdata(dev);
166 unsigned int have_retried = 0;
167
168 s3c_rtc_enable_clk(info);
169
170 retry_get_time:
171 rtc_tm->tm_min = readb(info->base + S3C2410_RTCMIN);
172 rtc_tm->tm_hour = readb(info->base + S3C2410_RTCHOUR);
173 rtc_tm->tm_mday = readb(info->base + S3C2410_RTCDATE);
174 rtc_tm->tm_mon = readb(info->base + S3C2410_RTCMON);
175 rtc_tm->tm_year = readb(info->base + S3C2410_RTCYEAR);
176 rtc_tm->tm_sec = readb(info->base + S3C2410_RTCSEC);
177
178 /* the only way to work out whether the system was mid-update
179 * when we read it is to check the second counter, and if it
180 * is zero, then we re-try the entire read
181 */
182
183 if (rtc_tm->tm_sec == 0 && !have_retried) {
184 have_retried = 1;
185 goto retry_get_time;
186 }
187
188 rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
189 rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
190 rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
191 rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
192 rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
193 rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);
194
195 s3c_rtc_disable_clk(info);
196
197 rtc_tm->tm_year += 100;
198
199 dev_dbg(dev, "read time %04d.%02d.%02d %02d:%02d:%02d\n",
200 1900 + rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday,
201 rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);
202
203 rtc_tm->tm_mon -= 1;
204
205 return rtc_valid_tm(rtc_tm);
206 }
207
s3c_rtc_settime(struct device * dev,struct rtc_time * tm)208 static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
209 {
210 struct s3c_rtc *info = dev_get_drvdata(dev);
211 int year = tm->tm_year - 100;
212
213 dev_dbg(dev, "set time %04d.%02d.%02d %02d:%02d:%02d\n",
214 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
215 tm->tm_hour, tm->tm_min, tm->tm_sec);
216
217 /* we get around y2k by simply not supporting it */
218
219 if (year < 0 || year >= 100) {
220 dev_err(dev, "rtc only supports 100 years\n");
221 return -EINVAL;
222 }
223
224 s3c_rtc_enable_clk(info);
225
226 writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_RTCSEC);
227 writeb(bin2bcd(tm->tm_min), info->base + S3C2410_RTCMIN);
228 writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_RTCHOUR);
229 writeb(bin2bcd(tm->tm_mday), info->base + S3C2410_RTCDATE);
230 writeb(bin2bcd(tm->tm_mon + 1), info->base + S3C2410_RTCMON);
231 writeb(bin2bcd(year), info->base + S3C2410_RTCYEAR);
232
233 s3c_rtc_disable_clk(info);
234
235 return 0;
236 }
237
s3c_rtc_getalarm(struct device * dev,struct rtc_wkalrm * alrm)238 static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
239 {
240 struct s3c_rtc *info = dev_get_drvdata(dev);
241 struct rtc_time *alm_tm = &alrm->time;
242 unsigned int alm_en;
243
244 s3c_rtc_enable_clk(info);
245
246 alm_tm->tm_sec = readb(info->base + S3C2410_ALMSEC);
247 alm_tm->tm_min = readb(info->base + S3C2410_ALMMIN);
248 alm_tm->tm_hour = readb(info->base + S3C2410_ALMHOUR);
249 alm_tm->tm_mon = readb(info->base + S3C2410_ALMMON);
250 alm_tm->tm_mday = readb(info->base + S3C2410_ALMDATE);
251 alm_tm->tm_year = readb(info->base + S3C2410_ALMYEAR);
252
253 alm_en = readb(info->base + S3C2410_RTCALM);
254
255 s3c_rtc_disable_clk(info);
256
257 alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0;
258
259 dev_dbg(dev, "read alarm %d, %04d.%02d.%02d %02d:%02d:%02d\n",
260 alm_en,
261 1900 + alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday,
262 alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec);
263
264 /* decode the alarm enable field */
265 if (alm_en & S3C2410_RTCALM_SECEN)
266 alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec);
267 else
268 alm_tm->tm_sec = -1;
269
270 if (alm_en & S3C2410_RTCALM_MINEN)
271 alm_tm->tm_min = bcd2bin(alm_tm->tm_min);
272 else
273 alm_tm->tm_min = -1;
274
275 if (alm_en & S3C2410_RTCALM_HOUREN)
276 alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour);
277 else
278 alm_tm->tm_hour = -1;
279
280 if (alm_en & S3C2410_RTCALM_DAYEN)
281 alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday);
282 else
283 alm_tm->tm_mday = -1;
284
285 if (alm_en & S3C2410_RTCALM_MONEN) {
286 alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon);
287 alm_tm->tm_mon -= 1;
288 } else {
289 alm_tm->tm_mon = -1;
290 }
291
292 if (alm_en & S3C2410_RTCALM_YEAREN)
293 alm_tm->tm_year = bcd2bin(alm_tm->tm_year);
294 else
295 alm_tm->tm_year = -1;
296
297 return 0;
298 }
299
s3c_rtc_setalarm(struct device * dev,struct rtc_wkalrm * alrm)300 static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
301 {
302 struct s3c_rtc *info = dev_get_drvdata(dev);
303 struct rtc_time *tm = &alrm->time;
304 unsigned int alrm_en;
305
306 dev_dbg(dev, "s3c_rtc_setalarm: %d, %04d.%02d.%02d %02d:%02d:%02d\n",
307 alrm->enabled,
308 1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday,
309 tm->tm_hour, tm->tm_min, tm->tm_sec);
310
311 s3c_rtc_enable_clk(info);
312
313 alrm_en = readb(info->base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
314 writeb(0x00, info->base + S3C2410_RTCALM);
315
316 if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
317 alrm_en |= S3C2410_RTCALM_SECEN;
318 writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_ALMSEC);
319 }
320
321 if (tm->tm_min < 60 && tm->tm_min >= 0) {
322 alrm_en |= S3C2410_RTCALM_MINEN;
323 writeb(bin2bcd(tm->tm_min), info->base + S3C2410_ALMMIN);
324 }
325
326 if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
327 alrm_en |= S3C2410_RTCALM_HOUREN;
328 writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_ALMHOUR);
329 }
330
331 dev_dbg(dev, "setting S3C2410_RTCALM to %08x\n", alrm_en);
332
333 writeb(alrm_en, info->base + S3C2410_RTCALM);
334
335 s3c_rtc_disable_clk(info);
336
337 s3c_rtc_setaie(dev, alrm->enabled);
338
339 return 0;
340 }
341
s3c_rtc_proc(struct device * dev,struct seq_file * seq)342 static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
343 {
344 struct s3c_rtc *info = dev_get_drvdata(dev);
345
346 s3c_rtc_enable_clk(info);
347
348 if (info->data->enable_tick)
349 info->data->enable_tick(info, seq);
350
351 s3c_rtc_disable_clk(info);
352
353 return 0;
354 }
355
356 static const struct rtc_class_ops s3c_rtcops = {
357 .read_time = s3c_rtc_gettime,
358 .set_time = s3c_rtc_settime,
359 .read_alarm = s3c_rtc_getalarm,
360 .set_alarm = s3c_rtc_setalarm,
361 .proc = s3c_rtc_proc,
362 .alarm_irq_enable = s3c_rtc_setaie,
363 };
364
s3c24xx_rtc_enable(struct s3c_rtc * info)365 static void s3c24xx_rtc_enable(struct s3c_rtc *info)
366 {
367 unsigned int con, tmp;
368
369 con = readw(info->base + S3C2410_RTCCON);
370 /* re-enable the device, and check it is ok */
371 if ((con & S3C2410_RTCCON_RTCEN) == 0) {
372 dev_info(info->dev, "rtc disabled, re-enabling\n");
373
374 tmp = readw(info->base + S3C2410_RTCCON);
375 writew(tmp | S3C2410_RTCCON_RTCEN,
376 info->base + S3C2410_RTCCON);
377 }
378
379 if (con & S3C2410_RTCCON_CNTSEL) {
380 dev_info(info->dev, "removing RTCCON_CNTSEL\n");
381
382 tmp = readw(info->base + S3C2410_RTCCON);
383 writew(tmp & ~S3C2410_RTCCON_CNTSEL,
384 info->base + S3C2410_RTCCON);
385 }
386
387 if (con & S3C2410_RTCCON_CLKRST) {
388 dev_info(info->dev, "removing RTCCON_CLKRST\n");
389
390 tmp = readw(info->base + S3C2410_RTCCON);
391 writew(tmp & ~S3C2410_RTCCON_CLKRST,
392 info->base + S3C2410_RTCCON);
393 }
394 }
395
s3c24xx_rtc_disable(struct s3c_rtc * info)396 static void s3c24xx_rtc_disable(struct s3c_rtc *info)
397 {
398 unsigned int con;
399
400 con = readw(info->base + S3C2410_RTCCON);
401 con &= ~S3C2410_RTCCON_RTCEN;
402 writew(con, info->base + S3C2410_RTCCON);
403
404 con = readb(info->base + S3C2410_TICNT);
405 con &= ~S3C2410_TICNT_ENABLE;
406 writeb(con, info->base + S3C2410_TICNT);
407 }
408
s3c6410_rtc_disable(struct s3c_rtc * info)409 static void s3c6410_rtc_disable(struct s3c_rtc *info)
410 {
411 unsigned int con;
412
413 con = readw(info->base + S3C2410_RTCCON);
414 con &= ~S3C64XX_RTCCON_TICEN;
415 con &= ~S3C2410_RTCCON_RTCEN;
416 writew(con, info->base + S3C2410_RTCCON);
417 }
418
s3c_rtc_remove(struct platform_device * pdev)419 static int s3c_rtc_remove(struct platform_device *pdev)
420 {
421 struct s3c_rtc *info = platform_get_drvdata(pdev);
422
423 s3c_rtc_setaie(info->dev, 0);
424
425 clk_unprepare(info->rtc_clk);
426 info->rtc_clk = NULL;
427
428 return 0;
429 }
430
431 static const struct of_device_id s3c_rtc_dt_match[];
432
s3c_rtc_get_data(struct platform_device * pdev)433 static struct s3c_rtc_data *s3c_rtc_get_data(struct platform_device *pdev)
434 {
435 const struct of_device_id *match;
436
437 match = of_match_node(s3c_rtc_dt_match, pdev->dev.of_node);
438 return (struct s3c_rtc_data *)match->data;
439 }
440
s3c_rtc_probe(struct platform_device * pdev)441 static int s3c_rtc_probe(struct platform_device *pdev)
442 {
443 struct s3c_rtc *info = NULL;
444 struct rtc_time rtc_tm;
445 struct resource *res;
446 int ret;
447
448 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
449 if (!info)
450 return -ENOMEM;
451
452 /* find the IRQs */
453 info->irq_tick = platform_get_irq(pdev, 1);
454 if (info->irq_tick < 0) {
455 dev_err(&pdev->dev, "no irq for rtc tick\n");
456 return info->irq_tick;
457 }
458
459 info->dev = &pdev->dev;
460 info->data = s3c_rtc_get_data(pdev);
461 if (!info->data) {
462 dev_err(&pdev->dev, "failed getting s3c_rtc_data\n");
463 return -EINVAL;
464 }
465 spin_lock_init(&info->pie_lock);
466 spin_lock_init(&info->alarm_clk_lock);
467
468 platform_set_drvdata(pdev, info);
469
470 info->irq_alarm = platform_get_irq(pdev, 0);
471 if (info->irq_alarm < 0) {
472 dev_err(&pdev->dev, "no irq for alarm\n");
473 return info->irq_alarm;
474 }
475
476 dev_dbg(&pdev->dev, "s3c2410_rtc: tick irq %d, alarm irq %d\n",
477 info->irq_tick, info->irq_alarm);
478
479 /* get the memory region */
480 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
481 info->base = devm_ioremap_resource(&pdev->dev, res);
482 if (IS_ERR(info->base))
483 return PTR_ERR(info->base);
484
485 info->rtc_clk = devm_clk_get(&pdev->dev, "rtc");
486 if (IS_ERR(info->rtc_clk)) {
487 dev_err(&pdev->dev, "failed to find rtc clock\n");
488 return PTR_ERR(info->rtc_clk);
489 }
490 clk_prepare_enable(info->rtc_clk);
491
492 if (info->data->needs_src_clk) {
493 info->rtc_src_clk = devm_clk_get(&pdev->dev, "rtc_src");
494 if (IS_ERR(info->rtc_src_clk)) {
495 dev_err(&pdev->dev,
496 "failed to find rtc source clock\n");
497 return PTR_ERR(info->rtc_src_clk);
498 }
499 clk_prepare_enable(info->rtc_src_clk);
500 }
501
502 /* check to see if everything is setup correctly */
503 if (info->data->enable)
504 info->data->enable(info);
505
506 dev_dbg(&pdev->dev, "s3c2410_rtc: RTCCON=%02x\n",
507 readw(info->base + S3C2410_RTCCON));
508
509 device_init_wakeup(&pdev->dev, 1);
510
511 /* Check RTC Time */
512 if (s3c_rtc_gettime(&pdev->dev, &rtc_tm)) {
513 rtc_tm.tm_year = 100;
514 rtc_tm.tm_mon = 0;
515 rtc_tm.tm_mday = 1;
516 rtc_tm.tm_hour = 0;
517 rtc_tm.tm_min = 0;
518 rtc_tm.tm_sec = 0;
519
520 s3c_rtc_settime(&pdev->dev, &rtc_tm);
521
522 dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n");
523 }
524
525 /* register RTC and exit */
526 info->rtc = devm_rtc_device_register(&pdev->dev, "s3c", &s3c_rtcops,
527 THIS_MODULE);
528 if (IS_ERR(info->rtc)) {
529 dev_err(&pdev->dev, "cannot attach rtc\n");
530 ret = PTR_ERR(info->rtc);
531 goto err_nortc;
532 }
533
534 ret = devm_request_irq(&pdev->dev, info->irq_alarm, s3c_rtc_alarmirq,
535 0, "s3c2410-rtc alarm", info);
536 if (ret) {
537 dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_alarm, ret);
538 goto err_nortc;
539 }
540
541 ret = devm_request_irq(&pdev->dev, info->irq_tick, s3c_rtc_tickirq,
542 0, "s3c2410-rtc tick", info);
543 if (ret) {
544 dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_tick, ret);
545 goto err_nortc;
546 }
547
548 if (info->data->select_tick_clk)
549 info->data->select_tick_clk(info);
550
551 s3c_rtc_setfreq(info, 1);
552
553 s3c_rtc_disable_clk(info);
554
555 return 0;
556
557 err_nortc:
558 if (info->data->disable)
559 info->data->disable(info);
560
561 if (info->data->needs_src_clk)
562 clk_disable_unprepare(info->rtc_src_clk);
563 clk_disable_unprepare(info->rtc_clk);
564
565 return ret;
566 }
567
568 #ifdef CONFIG_PM_SLEEP
569
s3c_rtc_suspend(struct device * dev)570 static int s3c_rtc_suspend(struct device *dev)
571 {
572 struct s3c_rtc *info = dev_get_drvdata(dev);
573
574 s3c_rtc_enable_clk(info);
575
576 /* save TICNT for anyone using periodic interrupts */
577 if (info->data->save_tick_cnt)
578 info->data->save_tick_cnt(info);
579
580 if (info->data->disable)
581 info->data->disable(info);
582
583 if (device_may_wakeup(dev) && !info->wake_en) {
584 if (enable_irq_wake(info->irq_alarm) == 0)
585 info->wake_en = true;
586 else
587 dev_err(dev, "enable_irq_wake failed\n");
588 }
589
590 return 0;
591 }
592
s3c_rtc_resume(struct device * dev)593 static int s3c_rtc_resume(struct device *dev)
594 {
595 struct s3c_rtc *info = dev_get_drvdata(dev);
596
597 if (info->data->enable)
598 info->data->enable(info);
599
600 if (info->data->restore_tick_cnt)
601 info->data->restore_tick_cnt(info);
602
603 s3c_rtc_disable_clk(info);
604
605 if (device_may_wakeup(dev) && info->wake_en) {
606 disable_irq_wake(info->irq_alarm);
607 info->wake_en = false;
608 }
609
610 return 0;
611 }
612 #endif
613 static SIMPLE_DEV_PM_OPS(s3c_rtc_pm_ops, s3c_rtc_suspend, s3c_rtc_resume);
614
s3c24xx_rtc_irq(struct s3c_rtc * info,int mask)615 static void s3c24xx_rtc_irq(struct s3c_rtc *info, int mask)
616 {
617 rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF);
618 }
619
s3c6410_rtc_irq(struct s3c_rtc * info,int mask)620 static void s3c6410_rtc_irq(struct s3c_rtc *info, int mask)
621 {
622 rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF);
623 writeb(mask, info->base + S3C2410_INTP);
624 }
625
s3c2410_rtc_setfreq(struct s3c_rtc * info,int freq)626 static void s3c2410_rtc_setfreq(struct s3c_rtc *info, int freq)
627 {
628 unsigned int tmp = 0;
629 int val;
630
631 tmp = readb(info->base + S3C2410_TICNT);
632 tmp &= S3C2410_TICNT_ENABLE;
633
634 val = (info->rtc->max_user_freq / freq) - 1;
635 tmp |= val;
636
637 writel(tmp, info->base + S3C2410_TICNT);
638 }
639
s3c2416_rtc_setfreq(struct s3c_rtc * info,int freq)640 static void s3c2416_rtc_setfreq(struct s3c_rtc *info, int freq)
641 {
642 unsigned int tmp = 0;
643 int val;
644
645 tmp = readb(info->base + S3C2410_TICNT);
646 tmp &= S3C2410_TICNT_ENABLE;
647
648 val = (info->rtc->max_user_freq / freq) - 1;
649
650 tmp |= S3C2443_TICNT_PART(val);
651 writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1);
652
653 writel(S3C2416_TICNT2_PART(val), info->base + S3C2416_TICNT2);
654
655 writel(tmp, info->base + S3C2410_TICNT);
656 }
657
s3c2443_rtc_setfreq(struct s3c_rtc * info,int freq)658 static void s3c2443_rtc_setfreq(struct s3c_rtc *info, int freq)
659 {
660 unsigned int tmp = 0;
661 int val;
662
663 tmp = readb(info->base + S3C2410_TICNT);
664 tmp &= S3C2410_TICNT_ENABLE;
665
666 val = (info->rtc->max_user_freq / freq) - 1;
667
668 tmp |= S3C2443_TICNT_PART(val);
669 writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1);
670
671 writel(tmp, info->base + S3C2410_TICNT);
672 }
673
s3c6410_rtc_setfreq(struct s3c_rtc * info,int freq)674 static void s3c6410_rtc_setfreq(struct s3c_rtc *info, int freq)
675 {
676 int val;
677
678 val = (info->rtc->max_user_freq / freq) - 1;
679 writel(val, info->base + S3C2410_TICNT);
680 }
681
s3c24xx_rtc_enable_tick(struct s3c_rtc * info,struct seq_file * seq)682 static void s3c24xx_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq)
683 {
684 unsigned int ticnt;
685
686 ticnt = readb(info->base + S3C2410_TICNT);
687 ticnt &= S3C2410_TICNT_ENABLE;
688
689 seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no");
690 }
691
s3c2416_rtc_select_tick_clk(struct s3c_rtc * info)692 static void s3c2416_rtc_select_tick_clk(struct s3c_rtc *info)
693 {
694 unsigned int con;
695
696 con = readw(info->base + S3C2410_RTCCON);
697 con |= S3C2443_RTCCON_TICSEL;
698 writew(con, info->base + S3C2410_RTCCON);
699 }
700
s3c6410_rtc_enable_tick(struct s3c_rtc * info,struct seq_file * seq)701 static void s3c6410_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq)
702 {
703 unsigned int ticnt;
704
705 ticnt = readw(info->base + S3C2410_RTCCON);
706 ticnt &= S3C64XX_RTCCON_TICEN;
707
708 seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no");
709 }
710
s3c24xx_rtc_save_tick_cnt(struct s3c_rtc * info)711 static void s3c24xx_rtc_save_tick_cnt(struct s3c_rtc *info)
712 {
713 info->ticnt_save = readb(info->base + S3C2410_TICNT);
714 }
715
s3c24xx_rtc_restore_tick_cnt(struct s3c_rtc * info)716 static void s3c24xx_rtc_restore_tick_cnt(struct s3c_rtc *info)
717 {
718 writeb(info->ticnt_save, info->base + S3C2410_TICNT);
719 }
720
s3c6410_rtc_save_tick_cnt(struct s3c_rtc * info)721 static void s3c6410_rtc_save_tick_cnt(struct s3c_rtc *info)
722 {
723 info->ticnt_en_save = readw(info->base + S3C2410_RTCCON);
724 info->ticnt_en_save &= S3C64XX_RTCCON_TICEN;
725 info->ticnt_save = readl(info->base + S3C2410_TICNT);
726 }
727
s3c6410_rtc_restore_tick_cnt(struct s3c_rtc * info)728 static void s3c6410_rtc_restore_tick_cnt(struct s3c_rtc *info)
729 {
730 unsigned int con;
731
732 writel(info->ticnt_save, info->base + S3C2410_TICNT);
733 if (info->ticnt_en_save) {
734 con = readw(info->base + S3C2410_RTCCON);
735 writew(con | info->ticnt_en_save,
736 info->base + S3C2410_RTCCON);
737 }
738 }
739
740 static struct s3c_rtc_data const s3c2410_rtc_data = {
741 .max_user_freq = 128,
742 .irq_handler = s3c24xx_rtc_irq,
743 .set_freq = s3c2410_rtc_setfreq,
744 .enable_tick = s3c24xx_rtc_enable_tick,
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 s3c2416_rtc_data = {
752 .max_user_freq = 32768,
753 .irq_handler = s3c24xx_rtc_irq,
754 .set_freq = s3c2416_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 s3c2443_rtc_data = {
764 .max_user_freq = 32768,
765 .irq_handler = s3c24xx_rtc_irq,
766 .set_freq = s3c2443_rtc_setfreq,
767 .enable_tick = s3c24xx_rtc_enable_tick,
768 .select_tick_clk = s3c2416_rtc_select_tick_clk,
769 .save_tick_cnt = s3c24xx_rtc_save_tick_cnt,
770 .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt,
771 .enable = s3c24xx_rtc_enable,
772 .disable = s3c24xx_rtc_disable,
773 };
774
775 static struct s3c_rtc_data const s3c6410_rtc_data = {
776 .max_user_freq = 32768,
777 .needs_src_clk = true,
778 .irq_handler = s3c6410_rtc_irq,
779 .set_freq = s3c6410_rtc_setfreq,
780 .enable_tick = s3c6410_rtc_enable_tick,
781 .save_tick_cnt = s3c6410_rtc_save_tick_cnt,
782 .restore_tick_cnt = s3c6410_rtc_restore_tick_cnt,
783 .enable = s3c24xx_rtc_enable,
784 .disable = s3c6410_rtc_disable,
785 };
786
787 static struct s3c_rtc_data const exynos3250_rtc_data = {
788 .max_user_freq = 32768,
789 .needs_src_clk = true,
790 .irq_handler = s3c6410_rtc_irq,
791 .set_freq = s3c6410_rtc_setfreq,
792 .enable_tick = s3c6410_rtc_enable_tick,
793 .save_tick_cnt = s3c6410_rtc_save_tick_cnt,
794 .restore_tick_cnt = s3c6410_rtc_restore_tick_cnt,
795 .enable = s3c24xx_rtc_enable,
796 .disable = s3c6410_rtc_disable,
797 };
798
799 static const struct of_device_id s3c_rtc_dt_match[] = {
800 {
801 .compatible = "samsung,s3c2410-rtc",
802 .data = (void *)&s3c2410_rtc_data,
803 }, {
804 .compatible = "samsung,s3c2416-rtc",
805 .data = (void *)&s3c2416_rtc_data,
806 }, {
807 .compatible = "samsung,s3c2443-rtc",
808 .data = (void *)&s3c2443_rtc_data,
809 }, {
810 .compatible = "samsung,s3c6410-rtc",
811 .data = (void *)&s3c6410_rtc_data,
812 }, {
813 .compatible = "samsung,exynos3250-rtc",
814 .data = (void *)&exynos3250_rtc_data,
815 },
816 { /* sentinel */ },
817 };
818 MODULE_DEVICE_TABLE(of, s3c_rtc_dt_match);
819
820 static struct platform_driver s3c_rtc_driver = {
821 .probe = s3c_rtc_probe,
822 .remove = s3c_rtc_remove,
823 .driver = {
824 .name = "s3c-rtc",
825 .pm = &s3c_rtc_pm_ops,
826 .of_match_table = of_match_ptr(s3c_rtc_dt_match),
827 },
828 };
829 module_platform_driver(s3c_rtc_driver);
830
831 MODULE_DESCRIPTION("Samsung S3C RTC Driver");
832 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
833 MODULE_LICENSE("GPL");
834 MODULE_ALIAS("platform:s3c2410-rtc");
835