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drivers/rtc/rtc-s3c.c: fix initialization failure without rtc source clock
[people/ms/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 bool enabled;
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
70 static void s3c_rtc_alarm_clk_enable(struct s3c_rtc *info, bool enable)
71 {
72 unsigned long irq_flags;
73
74 spin_lock_irqsave(&info->alarm_clk_lock, irq_flags);
75 if (enable) {
76 if (!info->enabled) {
77 clk_enable(info->rtc_clk);
78 if (info->data->needs_src_clk)
79 clk_enable(info->rtc_src_clk);
80 info->enabled = true;
81 }
82 } else {
83 if (info->enabled) {
84 if (info->data->needs_src_clk)
85 clk_disable(info->rtc_src_clk);
86 clk_disable(info->rtc_clk);
87 info->enabled = false;
88 }
89 }
90 spin_unlock_irqrestore(&info->alarm_clk_lock, irq_flags);
91 }
92
93 /* IRQ Handlers */
94 static irqreturn_t s3c_rtc_tickirq(int irq, void *id)
95 {
96 struct s3c_rtc *info = (struct s3c_rtc *)id;
97
98 if (info->data->irq_handler)
99 info->data->irq_handler(info, S3C2410_INTP_TIC);
100
101 return IRQ_HANDLED;
102 }
103
104 static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)
105 {
106 struct s3c_rtc *info = (struct s3c_rtc *)id;
107
108 if (info->data->irq_handler)
109 info->data->irq_handler(info, S3C2410_INTP_ALM);
110
111 return IRQ_HANDLED;
112 }
113
114 /* Update control registers */
115 static int s3c_rtc_setaie(struct device *dev, unsigned int enabled)
116 {
117 struct s3c_rtc *info = dev_get_drvdata(dev);
118 unsigned int tmp;
119
120 dev_dbg(info->dev, "%s: aie=%d\n", __func__, enabled);
121
122 clk_enable(info->rtc_clk);
123 if (info->data->needs_src_clk)
124 clk_enable(info->rtc_src_clk);
125 tmp = readb(info->base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
126
127 if (enabled)
128 tmp |= S3C2410_RTCALM_ALMEN;
129
130 writeb(tmp, info->base + S3C2410_RTCALM);
131 if (info->data->needs_src_clk)
132 clk_disable(info->rtc_src_clk);
133 clk_disable(info->rtc_clk);
134
135 s3c_rtc_alarm_clk_enable(info, enabled);
136
137 return 0;
138 }
139
140 /* Set RTC frequency */
141 static int s3c_rtc_setfreq(struct s3c_rtc *info, int freq)
142 {
143 if (!is_power_of_2(freq))
144 return -EINVAL;
145
146 clk_enable(info->rtc_clk);
147 if (info->data->needs_src_clk)
148 clk_enable(info->rtc_src_clk);
149 spin_lock_irq(&info->pie_lock);
150
151 if (info->data->set_freq)
152 info->data->set_freq(info, freq);
153
154 spin_unlock_irq(&info->pie_lock);
155 if (info->data->needs_src_clk)
156 clk_disable(info->rtc_src_clk);
157 clk_disable(info->rtc_clk);
158
159 return 0;
160 }
161
162 /* Time read/write */
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 clk_enable(info->rtc_clk);
169 if (info->data->needs_src_clk)
170 clk_enable(info->rtc_src_clk);
171
172 retry_get_time:
173 rtc_tm->tm_min = readb(info->base + S3C2410_RTCMIN);
174 rtc_tm->tm_hour = readb(info->base + S3C2410_RTCHOUR);
175 rtc_tm->tm_mday = readb(info->base + S3C2410_RTCDATE);
176 rtc_tm->tm_mon = readb(info->base + S3C2410_RTCMON);
177 rtc_tm->tm_year = readb(info->base + S3C2410_RTCYEAR);
178 rtc_tm->tm_sec = readb(info->base + S3C2410_RTCSEC);
179
180 /* the only way to work out whether the system was mid-update
181 * when we read it is to check the second counter, and if it
182 * is zero, then we re-try the entire read
183 */
184
185 if (rtc_tm->tm_sec == 0 && !have_retried) {
186 have_retried = 1;
187 goto retry_get_time;
188 }
189
190 rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
191 rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
192 rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
193 rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
194 rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
195 rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);
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 if (info->data->needs_src_clk)
206 clk_disable(info->rtc_src_clk);
207 clk_disable(info->rtc_clk);
208
209 return rtc_valid_tm(rtc_tm);
210 }
211
212 static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
213 {
214 struct s3c_rtc *info = dev_get_drvdata(dev);
215 int year = tm->tm_year - 100;
216
217 dev_dbg(dev, "set time %04d.%02d.%02d %02d:%02d:%02d\n",
218 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
219 tm->tm_hour, tm->tm_min, tm->tm_sec);
220
221 /* we get around y2k by simply not supporting it */
222
223 if (year < 0 || year >= 100) {
224 dev_err(dev, "rtc only supports 100 years\n");
225 return -EINVAL;
226 }
227
228 clk_enable(info->rtc_clk);
229 if (info->data->needs_src_clk)
230 clk_enable(info->rtc_src_clk);
231
232 writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_RTCSEC);
233 writeb(bin2bcd(tm->tm_min), info->base + S3C2410_RTCMIN);
234 writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_RTCHOUR);
235 writeb(bin2bcd(tm->tm_mday), info->base + S3C2410_RTCDATE);
236 writeb(bin2bcd(tm->tm_mon + 1), info->base + S3C2410_RTCMON);
237 writeb(bin2bcd(year), info->base + S3C2410_RTCYEAR);
238
239 if (info->data->needs_src_clk)
240 clk_disable(info->rtc_src_clk);
241 clk_disable(info->rtc_clk);
242
243 return 0;
244 }
245
246 static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
247 {
248 struct s3c_rtc *info = dev_get_drvdata(dev);
249 struct rtc_time *alm_tm = &alrm->time;
250 unsigned int alm_en;
251
252 clk_enable(info->rtc_clk);
253 if (info->data->needs_src_clk)
254 clk_enable(info->rtc_src_clk);
255
256 alm_tm->tm_sec = readb(info->base + S3C2410_ALMSEC);
257 alm_tm->tm_min = readb(info->base + S3C2410_ALMMIN);
258 alm_tm->tm_hour = readb(info->base + S3C2410_ALMHOUR);
259 alm_tm->tm_mon = readb(info->base + S3C2410_ALMMON);
260 alm_tm->tm_mday = readb(info->base + S3C2410_ALMDATE);
261 alm_tm->tm_year = readb(info->base + S3C2410_ALMYEAR);
262
263 alm_en = readb(info->base + S3C2410_RTCALM);
264
265 alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0;
266
267 dev_dbg(dev, "read alarm %d, %04d.%02d.%02d %02d:%02d:%02d\n",
268 alm_en,
269 1900 + alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday,
270 alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec);
271
272
273 /* decode the alarm enable field */
274
275 if (alm_en & S3C2410_RTCALM_SECEN)
276 alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec);
277 else
278 alm_tm->tm_sec = -1;
279
280 if (alm_en & S3C2410_RTCALM_MINEN)
281 alm_tm->tm_min = bcd2bin(alm_tm->tm_min);
282 else
283 alm_tm->tm_min = -1;
284
285 if (alm_en & S3C2410_RTCALM_HOUREN)
286 alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour);
287 else
288 alm_tm->tm_hour = -1;
289
290 if (alm_en & S3C2410_RTCALM_DAYEN)
291 alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday);
292 else
293 alm_tm->tm_mday = -1;
294
295 if (alm_en & S3C2410_RTCALM_MONEN) {
296 alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon);
297 alm_tm->tm_mon -= 1;
298 } else {
299 alm_tm->tm_mon = -1;
300 }
301
302 if (alm_en & S3C2410_RTCALM_YEAREN)
303 alm_tm->tm_year = bcd2bin(alm_tm->tm_year);
304 else
305 alm_tm->tm_year = -1;
306
307 if (info->data->needs_src_clk)
308 clk_disable(info->rtc_src_clk);
309 clk_disable(info->rtc_clk);
310
311 return 0;
312 }
313
314 static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
315 {
316 struct s3c_rtc *info = dev_get_drvdata(dev);
317 struct rtc_time *tm = &alrm->time;
318 unsigned int alrm_en;
319
320 clk_enable(info->rtc_clk);
321 if (info->data->needs_src_clk)
322 clk_enable(info->rtc_src_clk);
323
324 dev_dbg(dev, "s3c_rtc_setalarm: %d, %04d.%02d.%02d %02d:%02d:%02d\n",
325 alrm->enabled,
326 1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday,
327 tm->tm_hour, tm->tm_min, tm->tm_sec);
328
329 alrm_en = readb(info->base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
330 writeb(0x00, info->base + S3C2410_RTCALM);
331
332 if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
333 alrm_en |= S3C2410_RTCALM_SECEN;
334 writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_ALMSEC);
335 }
336
337 if (tm->tm_min < 60 && tm->tm_min >= 0) {
338 alrm_en |= S3C2410_RTCALM_MINEN;
339 writeb(bin2bcd(tm->tm_min), info->base + S3C2410_ALMMIN);
340 }
341
342 if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
343 alrm_en |= S3C2410_RTCALM_HOUREN;
344 writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_ALMHOUR);
345 }
346
347 dev_dbg(dev, "setting S3C2410_RTCALM to %08x\n", alrm_en);
348
349 writeb(alrm_en, info->base + S3C2410_RTCALM);
350
351 s3c_rtc_setaie(dev, alrm->enabled);
352
353 if (info->data->needs_src_clk)
354 clk_disable(info->rtc_src_clk);
355 clk_disable(info->rtc_clk);
356
357 return 0;
358 }
359
360 static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
361 {
362 struct s3c_rtc *info = dev_get_drvdata(dev);
363
364 clk_enable(info->rtc_clk);
365 if (info->data->needs_src_clk)
366 clk_enable(info->rtc_src_clk);
367
368 if (info->data->enable_tick)
369 info->data->enable_tick(info, seq);
370
371 if (info->data->needs_src_clk)
372 clk_disable(info->rtc_src_clk);
373 clk_disable(info->rtc_clk);
374
375 return 0;
376 }
377
378 static const struct rtc_class_ops s3c_rtcops = {
379 .read_time = s3c_rtc_gettime,
380 .set_time = s3c_rtc_settime,
381 .read_alarm = s3c_rtc_getalarm,
382 .set_alarm = s3c_rtc_setalarm,
383 .proc = s3c_rtc_proc,
384 .alarm_irq_enable = s3c_rtc_setaie,
385 };
386
387 static void s3c24xx_rtc_enable(struct s3c_rtc *info)
388 {
389 unsigned int con, tmp;
390
391 clk_enable(info->rtc_clk);
392 if (info->data->needs_src_clk)
393 clk_enable(info->rtc_src_clk);
394
395 con = readw(info->base + S3C2410_RTCCON);
396 /* re-enable the device, and check it is ok */
397 if ((con & S3C2410_RTCCON_RTCEN) == 0) {
398 dev_info(info->dev, "rtc disabled, re-enabling\n");
399
400 tmp = readw(info->base + S3C2410_RTCCON);
401 writew(tmp | S3C2410_RTCCON_RTCEN,
402 info->base + S3C2410_RTCCON);
403 }
404
405 if (con & S3C2410_RTCCON_CNTSEL) {
406 dev_info(info->dev, "removing RTCCON_CNTSEL\n");
407
408 tmp = readw(info->base + S3C2410_RTCCON);
409 writew(tmp & ~S3C2410_RTCCON_CNTSEL,
410 info->base + S3C2410_RTCCON);
411 }
412
413 if (con & S3C2410_RTCCON_CLKRST) {
414 dev_info(info->dev, "removing RTCCON_CLKRST\n");
415
416 tmp = readw(info->base + S3C2410_RTCCON);
417 writew(tmp & ~S3C2410_RTCCON_CLKRST,
418 info->base + S3C2410_RTCCON);
419 }
420
421 if (info->data->needs_src_clk)
422 clk_disable(info->rtc_src_clk);
423 clk_disable(info->rtc_clk);
424 }
425
426 static void s3c24xx_rtc_disable(struct s3c_rtc *info)
427 {
428 unsigned int con;
429
430 clk_enable(info->rtc_clk);
431 if (info->data->needs_src_clk)
432 clk_enable(info->rtc_src_clk);
433
434 con = readw(info->base + S3C2410_RTCCON);
435 con &= ~S3C2410_RTCCON_RTCEN;
436 writew(con, info->base + S3C2410_RTCCON);
437
438 con = readb(info->base + S3C2410_TICNT);
439 con &= ~S3C2410_TICNT_ENABLE;
440 writeb(con, info->base + S3C2410_TICNT);
441
442 if (info->data->needs_src_clk)
443 clk_disable(info->rtc_src_clk);
444 clk_disable(info->rtc_clk);
445 }
446
447 static void s3c6410_rtc_disable(struct s3c_rtc *info)
448 {
449 unsigned int con;
450
451 clk_enable(info->rtc_clk);
452 if (info->data->needs_src_clk)
453 clk_enable(info->rtc_src_clk);
454
455 con = readw(info->base + S3C2410_RTCCON);
456 con &= ~S3C64XX_RTCCON_TICEN;
457 con &= ~S3C2410_RTCCON_RTCEN;
458 writew(con, info->base + S3C2410_RTCCON);
459
460 if (info->data->needs_src_clk)
461 clk_disable(info->rtc_src_clk);
462 clk_disable(info->rtc_clk);
463 }
464
465 static int s3c_rtc_remove(struct platform_device *pdev)
466 {
467 struct s3c_rtc *info = platform_get_drvdata(pdev);
468
469 s3c_rtc_setaie(info->dev, 0);
470
471 clk_unprepare(info->rtc_clk);
472 info->rtc_clk = NULL;
473
474 return 0;
475 }
476
477 static const struct of_device_id s3c_rtc_dt_match[];
478
479 static struct s3c_rtc_data *s3c_rtc_get_data(struct platform_device *pdev)
480 {
481 const struct of_device_id *match;
482
483 match = of_match_node(s3c_rtc_dt_match, pdev->dev.of_node);
484 return (struct s3c_rtc_data *)match->data;
485 }
486
487 static int s3c_rtc_probe(struct platform_device *pdev)
488 {
489 struct s3c_rtc *info = NULL;
490 struct rtc_time rtc_tm;
491 struct resource *res;
492 int ret;
493
494 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
495 if (!info)
496 return -ENOMEM;
497
498 /* find the IRQs */
499 info->irq_tick = platform_get_irq(pdev, 1);
500 if (info->irq_tick < 0) {
501 dev_err(&pdev->dev, "no irq for rtc tick\n");
502 return info->irq_tick;
503 }
504
505 info->dev = &pdev->dev;
506 info->data = s3c_rtc_get_data(pdev);
507 if (!info->data) {
508 dev_err(&pdev->dev, "failed getting s3c_rtc_data\n");
509 return -EINVAL;
510 }
511 spin_lock_init(&info->pie_lock);
512 spin_lock_init(&info->alarm_clk_lock);
513
514 platform_set_drvdata(pdev, info);
515
516 info->irq_alarm = platform_get_irq(pdev, 0);
517 if (info->irq_alarm < 0) {
518 dev_err(&pdev->dev, "no irq for alarm\n");
519 return info->irq_alarm;
520 }
521
522 dev_dbg(&pdev->dev, "s3c2410_rtc: tick irq %d, alarm irq %d\n",
523 info->irq_tick, info->irq_alarm);
524
525 /* get the memory region */
526 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
527 info->base = devm_ioremap_resource(&pdev->dev, res);
528 if (IS_ERR(info->base))
529 return PTR_ERR(info->base);
530
531 info->rtc_clk = devm_clk_get(&pdev->dev, "rtc");
532 if (IS_ERR(info->rtc_clk)) {
533 dev_err(&pdev->dev, "failed to find rtc clock\n");
534 return PTR_ERR(info->rtc_clk);
535 }
536 clk_prepare_enable(info->rtc_clk);
537
538 if (info->data->needs_src_clk) {
539 info->rtc_src_clk = devm_clk_get(&pdev->dev, "rtc_src");
540 if (IS_ERR(info->rtc_src_clk)) {
541 dev_err(&pdev->dev,
542 "failed to find rtc source clock\n");
543 return PTR_ERR(info->rtc_src_clk);
544 }
545 clk_prepare_enable(info->rtc_src_clk);
546 }
547
548 /* check to see if everything is setup correctly */
549 if (info->data->enable)
550 info->data->enable(info);
551
552 dev_dbg(&pdev->dev, "s3c2410_rtc: RTCCON=%02x\n",
553 readw(info->base + S3C2410_RTCCON));
554
555 device_init_wakeup(&pdev->dev, 1);
556
557 /* register RTC and exit */
558 info->rtc = devm_rtc_device_register(&pdev->dev, "s3c", &s3c_rtcops,
559 THIS_MODULE);
560 if (IS_ERR(info->rtc)) {
561 dev_err(&pdev->dev, "cannot attach rtc\n");
562 ret = PTR_ERR(info->rtc);
563 goto err_nortc;
564 }
565
566 ret = devm_request_irq(&pdev->dev, info->irq_alarm, s3c_rtc_alarmirq,
567 0, "s3c2410-rtc alarm", info);
568 if (ret) {
569 dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_alarm, ret);
570 goto err_nortc;
571 }
572
573 ret = devm_request_irq(&pdev->dev, info->irq_tick, s3c_rtc_tickirq,
574 0, "s3c2410-rtc tick", info);
575 if (ret) {
576 dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_tick, ret);
577 goto err_nortc;
578 }
579
580 /* Check RTC Time */
581 s3c_rtc_gettime(&pdev->dev, &rtc_tm);
582
583 if (rtc_valid_tm(&rtc_tm)) {
584 rtc_tm.tm_year = 100;
585 rtc_tm.tm_mon = 0;
586 rtc_tm.tm_mday = 1;
587 rtc_tm.tm_hour = 0;
588 rtc_tm.tm_min = 0;
589 rtc_tm.tm_sec = 0;
590
591 s3c_rtc_settime(&pdev->dev, &rtc_tm);
592
593 dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n");
594 }
595
596 if (info->data->select_tick_clk)
597 info->data->select_tick_clk(info);
598
599 s3c_rtc_setfreq(info, 1);
600
601 if (info->data->needs_src_clk)
602 clk_disable(info->rtc_src_clk);
603 clk_disable(info->rtc_clk);
604
605 return 0;
606
607 err_nortc:
608 if (info->data->disable)
609 info->data->disable(info);
610 clk_disable_unprepare(info->rtc_clk);
611
612 return ret;
613 }
614
615 #ifdef CONFIG_PM_SLEEP
616
617 static int s3c_rtc_suspend(struct device *dev)
618 {
619 struct s3c_rtc *info = dev_get_drvdata(dev);
620
621 clk_enable(info->rtc_clk);
622 if (info->data->needs_src_clk)
623 clk_enable(info->rtc_src_clk);
624
625 /* save TICNT for anyone using periodic interrupts */
626 if (info->data->save_tick_cnt)
627 info->data->save_tick_cnt(info);
628
629 if (info->data->disable)
630 info->data->disable(info);
631
632 if (device_may_wakeup(dev) && !info->wake_en) {
633 if (enable_irq_wake(info->irq_alarm) == 0)
634 info->wake_en = true;
635 else
636 dev_err(dev, "enable_irq_wake failed\n");
637 }
638
639 if (info->data->needs_src_clk)
640 clk_disable(info->rtc_src_clk);
641 clk_disable(info->rtc_clk);
642
643 return 0;
644 }
645
646 static int s3c_rtc_resume(struct device *dev)
647 {
648 struct s3c_rtc *info = dev_get_drvdata(dev);
649
650 clk_enable(info->rtc_clk);
651 if (info->data->needs_src_clk)
652 clk_enable(info->rtc_src_clk);
653
654 if (info->data->enable)
655 info->data->enable(info);
656
657 if (info->data->restore_tick_cnt)
658 info->data->restore_tick_cnt(info);
659
660 if (device_may_wakeup(dev) && info->wake_en) {
661 disable_irq_wake(info->irq_alarm);
662 info->wake_en = false;
663 }
664
665 if (info->data->needs_src_clk)
666 clk_disable(info->rtc_src_clk);
667 clk_disable(info->rtc_clk);
668
669 return 0;
670 }
671 #endif
672 static SIMPLE_DEV_PM_OPS(s3c_rtc_pm_ops, s3c_rtc_suspend, s3c_rtc_resume);
673
674 static void s3c24xx_rtc_irq(struct s3c_rtc *info, int mask)
675 {
676 clk_enable(info->rtc_clk);
677 if (info->data->needs_src_clk)
678 clk_enable(info->rtc_src_clk);
679 rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF);
680 if (info->data->needs_src_clk)
681 clk_disable(info->rtc_src_clk);
682 clk_disable(info->rtc_clk);
683
684 s3c_rtc_alarm_clk_enable(info, false);
685 }
686
687 static void s3c6410_rtc_irq(struct s3c_rtc *info, int mask)
688 {
689 clk_enable(info->rtc_clk);
690 if (info->data->needs_src_clk)
691 clk_enable(info->rtc_src_clk);
692 rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF);
693 writeb(mask, info->base + S3C2410_INTP);
694 if (info->data->needs_src_clk)
695 clk_disable(info->rtc_src_clk);
696 clk_disable(info->rtc_clk);
697
698 s3c_rtc_alarm_clk_enable(info, false);
699 }
700
701 static void s3c2410_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 tmp |= val;
711
712 writel(tmp, info->base + S3C2410_TICNT);
713 }
714
715 static void s3c2416_rtc_setfreq(struct s3c_rtc *info, int freq)
716 {
717 unsigned int tmp = 0;
718 int val;
719
720 tmp = readb(info->base + S3C2410_TICNT);
721 tmp &= S3C2410_TICNT_ENABLE;
722
723 val = (info->rtc->max_user_freq / freq) - 1;
724
725 tmp |= S3C2443_TICNT_PART(val);
726 writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1);
727
728 writel(S3C2416_TICNT2_PART(val), info->base + S3C2416_TICNT2);
729
730 writel(tmp, info->base + S3C2410_TICNT);
731 }
732
733 static void s3c2443_rtc_setfreq(struct s3c_rtc *info, int freq)
734 {
735 unsigned int tmp = 0;
736 int val;
737
738 tmp = readb(info->base + S3C2410_TICNT);
739 tmp &= S3C2410_TICNT_ENABLE;
740
741 val = (info->rtc->max_user_freq / freq) - 1;
742
743 tmp |= S3C2443_TICNT_PART(val);
744 writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1);
745
746 writel(tmp, info->base + S3C2410_TICNT);
747 }
748
749 static void s3c6410_rtc_setfreq(struct s3c_rtc *info, int freq)
750 {
751 int val;
752
753 val = (info->rtc->max_user_freq / freq) - 1;
754 writel(val, info->base + S3C2410_TICNT);
755 }
756
757 static void s3c24xx_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq)
758 {
759 unsigned int ticnt;
760
761 ticnt = readb(info->base + S3C2410_TICNT);
762 ticnt &= S3C2410_TICNT_ENABLE;
763
764 seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no");
765 }
766
767 static void s3c2416_rtc_select_tick_clk(struct s3c_rtc *info)
768 {
769 unsigned int con;
770
771 con = readw(info->base + S3C2410_RTCCON);
772 con |= S3C2443_RTCCON_TICSEL;
773 writew(con, info->base + S3C2410_RTCCON);
774 }
775
776 static void s3c6410_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq)
777 {
778 unsigned int ticnt;
779
780 ticnt = readw(info->base + S3C2410_RTCCON);
781 ticnt &= S3C64XX_RTCCON_TICEN;
782
783 seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no");
784 }
785
786 static void s3c24xx_rtc_save_tick_cnt(struct s3c_rtc *info)
787 {
788 info->ticnt_save = readb(info->base + S3C2410_TICNT);
789 }
790
791 static void s3c24xx_rtc_restore_tick_cnt(struct s3c_rtc *info)
792 {
793 writeb(info->ticnt_save, info->base + S3C2410_TICNT);
794 }
795
796 static void s3c6410_rtc_save_tick_cnt(struct s3c_rtc *info)
797 {
798 info->ticnt_en_save = readw(info->base + S3C2410_RTCCON);
799 info->ticnt_en_save &= S3C64XX_RTCCON_TICEN;
800 info->ticnt_save = readl(info->base + S3C2410_TICNT);
801 }
802
803 static void s3c6410_rtc_restore_tick_cnt(struct s3c_rtc *info)
804 {
805 unsigned int con;
806
807 writel(info->ticnt_save, info->base + S3C2410_TICNT);
808 if (info->ticnt_en_save) {
809 con = readw(info->base + S3C2410_RTCCON);
810 writew(con | info->ticnt_en_save,
811 info->base + S3C2410_RTCCON);
812 }
813 }
814
815 static struct s3c_rtc_data const s3c2410_rtc_data = {
816 .max_user_freq = 128,
817 .irq_handler = s3c24xx_rtc_irq,
818 .set_freq = s3c2410_rtc_setfreq,
819 .enable_tick = s3c24xx_rtc_enable_tick,
820 .save_tick_cnt = s3c24xx_rtc_save_tick_cnt,
821 .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt,
822 .enable = s3c24xx_rtc_enable,
823 .disable = s3c24xx_rtc_disable,
824 };
825
826 static struct s3c_rtc_data const s3c2416_rtc_data = {
827 .max_user_freq = 32768,
828 .irq_handler = s3c24xx_rtc_irq,
829 .set_freq = s3c2416_rtc_setfreq,
830 .enable_tick = s3c24xx_rtc_enable_tick,
831 .select_tick_clk = s3c2416_rtc_select_tick_clk,
832 .save_tick_cnt = s3c24xx_rtc_save_tick_cnt,
833 .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt,
834 .enable = s3c24xx_rtc_enable,
835 .disable = s3c24xx_rtc_disable,
836 };
837
838 static struct s3c_rtc_data const s3c2443_rtc_data = {
839 .max_user_freq = 32768,
840 .irq_handler = s3c24xx_rtc_irq,
841 .set_freq = s3c2443_rtc_setfreq,
842 .enable_tick = s3c24xx_rtc_enable_tick,
843 .select_tick_clk = s3c2416_rtc_select_tick_clk,
844 .save_tick_cnt = s3c24xx_rtc_save_tick_cnt,
845 .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt,
846 .enable = s3c24xx_rtc_enable,
847 .disable = s3c24xx_rtc_disable,
848 };
849
850 static struct s3c_rtc_data const s3c6410_rtc_data = {
851 .max_user_freq = 32768,
852 .irq_handler = s3c6410_rtc_irq,
853 .set_freq = s3c6410_rtc_setfreq,
854 .enable_tick = s3c6410_rtc_enable_tick,
855 .save_tick_cnt = s3c6410_rtc_save_tick_cnt,
856 .restore_tick_cnt = s3c6410_rtc_restore_tick_cnt,
857 .enable = s3c24xx_rtc_enable,
858 .disable = s3c6410_rtc_disable,
859 };
860
861 static struct s3c_rtc_data const exynos3250_rtc_data = {
862 .max_user_freq = 32768,
863 .needs_src_clk = true,
864 .irq_handler = s3c6410_rtc_irq,
865 .set_freq = s3c6410_rtc_setfreq,
866 .enable_tick = s3c6410_rtc_enable_tick,
867 .save_tick_cnt = s3c6410_rtc_save_tick_cnt,
868 .restore_tick_cnt = s3c6410_rtc_restore_tick_cnt,
869 .enable = s3c24xx_rtc_enable,
870 .disable = s3c6410_rtc_disable,
871 };
872
873 static const struct of_device_id s3c_rtc_dt_match[] = {
874 {
875 .compatible = "samsung,s3c2410-rtc",
876 .data = (void *)&s3c2410_rtc_data,
877 }, {
878 .compatible = "samsung,s3c2416-rtc",
879 .data = (void *)&s3c2416_rtc_data,
880 }, {
881 .compatible = "samsung,s3c2443-rtc",
882 .data = (void *)&s3c2443_rtc_data,
883 }, {
884 .compatible = "samsung,s3c6410-rtc",
885 .data = (void *)&s3c6410_rtc_data,
886 }, {
887 .compatible = "samsung,exynos3250-rtc",
888 .data = (void *)&exynos3250_rtc_data,
889 },
890 { /* sentinel */ },
891 };
892 MODULE_DEVICE_TABLE(of, s3c_rtc_dt_match);
893
894 static struct platform_driver s3c_rtc_driver = {
895 .probe = s3c_rtc_probe,
896 .remove = s3c_rtc_remove,
897 .driver = {
898 .name = "s3c-rtc",
899 .owner = THIS_MODULE,
900 .pm = &s3c_rtc_pm_ops,
901 .of_match_table = of_match_ptr(s3c_rtc_dt_match),
902 },
903 };
904 module_platform_driver(s3c_rtc_driver);
905
906 MODULE_DESCRIPTION("Samsung S3C RTC Driver");
907 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
908 MODULE_LICENSE("GPL");
909 MODULE_ALIAS("platform:s3c2410-rtc");
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